diff --git a/.gitignore b/.gitignore
index 7182935..2b95835 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,6 +19,7 @@
 # Protobuf output files
 **/*_pb2.py
 **/*_pb2_grpc.py
+**/*.pb.go
 
 # Editors
 *.bak
diff --git a/common/log/log.go b/common/log/log.go
index e9f3c1b..d751c34 100644
--- a/common/log/log.go
+++ b/common/log/log.go
@@ -1,7 +1,6 @@
 package log
 
 import (
-	"errors"
 	"fmt"
 	zp "go.uber.org/zap"
 	zc "go.uber.org/zap/zapcore"
@@ -148,7 +147,9 @@
 // this method will return an error
 func GetLogger() (Logger, error) {
 	if defaultLogger == nil {
-		return nil, errors.New("Uninitialized-logger")
+		// Setup the logger with default values - debug level,
+		SetLogger(JSON, 0, Fields{"instanceId": "default-logger"})
+		//return nil, errors.New("Uninitialized-logger")
 	}
 	return defaultLogger, nil
 }
diff --git a/compose/docker-compose-zk-kafka-test.yml b/compose/docker-compose-zk-kafka-test.yml
new file mode 100644
index 0000000..2cad1b8
--- /dev/null
+++ b/compose/docker-compose-zk-kafka-test.yml
@@ -0,0 +1,27 @@
+version: '2'
+services:
+  #
+  # Single-node zookeeper service
+  #
+  zookeeper:
+    image: "wurstmeister/zookeeper:latest"
+    ports:
+    - 2181:2181
+    environment:
+      SERVICE_2181_NAME: "zookeeper"
+  #
+  # Single-node kafka service
+  #
+  kafka:
+    image: "wurstmeister/kafka:latest"
+    ports:
+     - 9092:9092
+    environment:
+      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://10.100.198.220:9092
+      KAFKA_LISTENERS: PLAINTEXT://:9092
+#      KAFKA_ADVERTISED_HOST_NAME: 10.100.198.220
+      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
+      KAFKA_AUTO_CREATE_TOPICS_ENABLE: 'true'
+      SERVICE_9092_NAME: "kafka"
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
diff --git a/docker/Dockerfile.rw_core b/docker/Dockerfile.rw_core
index ecc9919..2431fa9 100644
--- a/docker/Dockerfile.rw_core
+++ b/docker/Dockerfile.rw_core
@@ -4,16 +4,30 @@
 FROM golang:alpine AS build-env
 
 # Install required packages
-RUN apk add --no-cache wget git make build-base
+RUN apk add --no-cache wget git make build-base protobuf protobuf-dev
 
 # Prepare directory structure
-RUN ["mkdir", "-p", "/src"]
+RUN ["mkdir", "-p", "/src", "src/protos"]
 RUN ["mkdir", "-p", "$GOPATH/src", "$GOPATH/pkg", "$GOPATH/bin"]
+RUN ["mkdir", "-p", "$GOPATH/src/github.com/opencord/voltha/protos/go"]
 
 # Copy files
 ADD rw_core $GOPATH/src/github.com/opencord/voltha-go/rw_core
 ADD common $GOPATH/src/github.com/opencord/voltha-go/common
 ADD db $GOPATH/src/github.com/opencord/voltha-go/db
+ADD kafka $GOPATH/src/github.com/opencord/voltha-go/kafka
+
+# Copy required proto files
+# ... VOLTHA proos
+ADD protos/*.proto /src/protos/
+ADD protos/scripts/* /src/protos/
+
+# Install golang protobuf
+RUN go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
+RUN go get -u github.com/golang/protobuf/protoc-gen-go
+
+# Compile protobuf files
+RUN sh /src/protos/build_protos.sh /src/protos
 
 # Build rw_core
 RUN cd $GOPATH/src/github.com/opencord/voltha-go/rw_core && go get -d ./... && go build -o /src/rw_core
diff --git a/kafka/kafka_inter_container_library.go b/kafka/kafka_inter_container_library.go
new file mode 100644
index 0000000..9db57a0
--- /dev/null
+++ b/kafka/kafka_inter_container_library.go
@@ -0,0 +1,804 @@
+package kafka
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"github.com/Shopify/sarama"
+	"github.com/golang/protobuf/proto"
+	"github.com/golang/protobuf/ptypes"
+	"github.com/golang/protobuf/ptypes/any"
+	"github.com/google/uuid"
+	"github.com/opencord/voltha-go/common/log"
+	ca "github.com/opencord/voltha-go/protos/core_adapter"
+	"reflect"
+	"sync"
+	"time"
+)
+
+// Initialize the logger - gets the default until the main function setup the logger
+func init() {
+	log.GetLogger()
+}
+
+const (
+	DefaultKafkaHost         = "10.100.198.240"
+	DefaultKafkaPort         = 9092
+	DefaultTopicName         = "Core"
+	DefaultSleepOnError      = 1
+	DefaultFlushFrequency    = 1
+	DefaultFlushMessages     = 1
+	DefaultFlushMaxmessages  = 1
+	DefaultMaxRetries        = 3
+	DefaultReturnSuccess     = false
+	DefaultReturnErrors      = true
+	DefaultConsumerMaxwait   = 50
+	DefaultMaxProcessingTime = 100
+	DefaultRequestTimeout    = 50 // 50 milliseconds
+)
+
+type consumerChannels struct {
+	consumer sarama.PartitionConsumer
+	channels []chan *ca.InterContainerMessage
+}
+
+// KafkaMessagingProxy represents the messaging proxy
+type KafkaMessagingProxy struct {
+	KafkaHost                     string
+	KafkaPort                     int
+	DefaultTopic                  *Topic
+	TargetInterface               interface{}
+	producer                      sarama.AsyncProducer
+	consumer                      sarama.Consumer
+	doneCh                        chan int
+	topicToConsumerChannelMap     map[string]*consumerChannels
+	transactionIdToChannelMap     map[string]chan *ca.InterContainerMessage
+	lockTopicToConsumerChannelMap sync.RWMutex
+	lockTransactionIdToChannelMap sync.RWMutex
+}
+
+type KafkaProxyOption func(*KafkaMessagingProxy)
+
+func KafkaHost(host string) KafkaProxyOption {
+	return func(args *KafkaMessagingProxy) {
+		args.KafkaHost = host
+	}
+}
+
+func KafkaPort(port int) KafkaProxyOption {
+	return func(args *KafkaMessagingProxy) {
+		args.KafkaPort = port
+	}
+}
+
+func DefaultTopic(topic *Topic) KafkaProxyOption {
+	return func(args *KafkaMessagingProxy) {
+		args.DefaultTopic = topic
+	}
+}
+
+func TargetInterface(target interface{}) KafkaProxyOption {
+	return func(args *KafkaMessagingProxy) {
+		args.TargetInterface = target
+	}
+}
+
+func NewKafkaMessagingProxy(opts ...KafkaProxyOption) (*KafkaMessagingProxy, error) {
+	proxy := &KafkaMessagingProxy{
+		KafkaHost:    DefaultKafkaHost,
+		KafkaPort:    DefaultKafkaPort,
+		DefaultTopic: &Topic{Name: DefaultTopicName},
+	}
+
+	for _, option := range opts {
+		option(proxy)
+	}
+
+	// Create the locks for all the maps
+	proxy.lockTopicToConsumerChannelMap = sync.RWMutex{}
+	proxy.lockTransactionIdToChannelMap = sync.RWMutex{}
+
+	return proxy, nil
+}
+
+func (kp *KafkaMessagingProxy) Start() error {
+	log.Info("Starting-Proxy")
+
+	// Create the Done channel
+	kp.doneCh = make(chan int, 1)
+
+	// Create the Publisher
+	if err := kp.createPublisher(DefaultMaxRetries); err != nil {
+		log.Errorw("Cannot-create-kafka-publisher", log.Fields{"error": err})
+		return err
+	}
+
+	// Create the master consumer
+	if err := kp.createConsumer(DefaultMaxRetries); err != nil {
+		log.Errorw("Cannot-create-kafka-consumer", log.Fields{"error": err})
+		return err
+	}
+
+	// Create the topic to consumer/channel map
+	kp.topicToConsumerChannelMap = make(map[string]*consumerChannels)
+
+	// Create the transactionId to Channel Map
+	kp.transactionIdToChannelMap = make(map[string]chan *ca.InterContainerMessage)
+
+	return nil
+}
+
+func (kp *KafkaMessagingProxy) Stop() {
+	log.Info("Stopping-Proxy")
+	if kp.producer != nil {
+		if err := kp.producer.Close(); err != nil {
+			panic(err)
+		}
+	}
+	if kp.consumer != nil {
+		if err := kp.consumer.Close(); err != nil {
+			panic(err)
+		}
+	}
+	//Close the done channel to close all long processing Go routines
+	close(kp.doneCh)
+}
+
+func (kp *KafkaMessagingProxy) InvokeRPC(ctx context.Context, rpc string, topic *Topic, waitForResponse bool,
+	kvArgs ...*KVArg) (bool, *any.Any) {
+	// Encode the request
+	protoRequest, err := encodeRequest(rpc, topic, kp.DefaultTopic, kvArgs...)
+	if err != nil {
+		log.Warnw("cannot-format-request", log.Fields{"rpc": rpc, "error": err})
+		return false, nil
+	}
+
+	// Subscribe for response, if needed, before sending request
+	var ch <-chan *ca.InterContainerMessage
+	if waitForResponse {
+		var err error
+		if ch, err = kp.subscribeForResponse(*kp.DefaultTopic, protoRequest.Header.Id); err != nil {
+			log.Errorw("failed-to-subscribe-for-response", log.Fields{"error": err, "topic": topic.Name})
+		}
+	}
+
+	// Send request
+	go kp.sendToKafkaTopic(protoRequest, topic)
+
+	if waitForResponse {
+		// if ctx is nil use a default timeout ctx to ensure we do not wait forever
+		var cancel context.CancelFunc
+		if ctx == nil {
+			ctx, cancel = context.WithTimeout(context.Background(), DefaultRequestTimeout*time.Millisecond)
+			defer cancel()
+		}
+
+		// Wait for response as well as timeout or cancellation
+		// Remove the subscription for a response on return
+		defer kp.unSubscribeForResponse(protoRequest.Header.Id)
+		select {
+		case msg := <-ch:
+			log.Debugw("received-response", log.Fields{"rpc": rpc, "msg": msg})
+
+			var responseBody *ca.InterContainerResponseBody
+			var err error
+			if responseBody, err = decodeResponse(msg); err != nil {
+				log.Errorw("decode-response-error", log.Fields{"error": err})
+			}
+			return responseBody.Success, responseBody.Result
+		case <-ctx.Done():
+			log.Debugw("context-cancelled", log.Fields{"rpc": rpc, "ctx": ctx.Err()})
+			//	 pack the error as proto any type
+			protoError := &ca.Error{Reason: ctx.Err().Error()}
+			var marshalledArg *any.Any
+			if marshalledArg, err = ptypes.MarshalAny(protoError); err != nil {
+				return false, nil // Should never happen
+			}
+			return false, marshalledArg
+		case <-kp.doneCh:
+			log.Infow("received-exit-signal", log.Fields{"topic": topic.Name, "rpc": rpc})
+			return true, nil
+		}
+	}
+	return true, nil
+}
+
+// Subscribe allows a caller to subscribe to a given topic.  A channel is returned to the
+// caller to receive messages from that topic.
+func (kp *KafkaMessagingProxy) Subscribe(topic Topic) (<-chan *ca.InterContainerMessage, error) {
+
+	log.Debugw("subscribe", log.Fields{"topic": topic.Name})
+
+	if consumerCh := kp.getConsumerChannel(topic); consumerCh != nil {
+		log.Debugw("topic-already-subscribed", log.Fields{"topic": topic.Name})
+		// Create a channel specific for that consumer and add it to the consumer channel map
+		ch := make(chan *ca.InterContainerMessage)
+		kp.addChannelToConsumerChannelMap(topic, ch)
+		return ch, nil
+	}
+
+	// Register for the topic and set it up
+	var consumerListeningChannel chan *ca.InterContainerMessage
+	var err error
+	if consumerListeningChannel, err = kp.setupConsumerChannel(topic); err != nil {
+		log.Warnw("create-consumer-channel-failure", log.Fields{"error": err, "topic": topic.Name})
+		return nil, err
+	}
+
+	return consumerListeningChannel, nil
+}
+
+func (kp *KafkaMessagingProxy) UnSubscribe(topic Topic, ch <-chan *ca.InterContainerMessage) error {
+	log.Debugw("unsubscribing-channel-from-topic", log.Fields{"topic": topic.Name})
+	err := kp.removeChannelFromConsumerChannelMap(topic, ch)
+	return err
+}
+
+// SubscribeWithTarget allows a caller to assign a target object to be invoked automatically
+// when a message is received on a given topic
+func (kp *KafkaMessagingProxy) SubscribeWithTarget(topic Topic, targetInterface interface{}) error {
+
+	// Subscribe to receive messages for that topic
+	var ch <-chan *ca.InterContainerMessage
+	var err error
+	if ch, err = kp.Subscribe(topic); err != nil {
+		log.Errorw("failed-to-subscribe", log.Fields{"error": err, "topic": topic.Name})
+	}
+	// Launch a go routine to receive and process kafka messages
+	go kp.waitForRequest(ch, topic, targetInterface)
+
+	return nil
+}
+
+func (kp *KafkaMessagingProxy) UnSubscribeTarget(ctx context.Context, topic Topic, targetInterface interface{}) error {
+	// TODO - mostly relevant with multiple interfaces
+	return nil
+}
+
+func (kp *KafkaMessagingProxy) addToTopicToConsumerChannelMap(id string, arg *consumerChannels) {
+	kp.lockTopicToConsumerChannelMap.Lock()
+	defer kp.lockTopicToConsumerChannelMap.Unlock()
+	if _, exist := kp.topicToConsumerChannelMap[id]; !exist {
+		kp.topicToConsumerChannelMap[id] = arg
+	}
+}
+
+func (kp *KafkaMessagingProxy) deleteFromTopicToConsumerChannelMap(id string) {
+	kp.lockTopicToConsumerChannelMap.Lock()
+	defer kp.lockTopicToConsumerChannelMap.Unlock()
+	if _, exist := kp.topicToConsumerChannelMap[id]; exist {
+		delete(kp.topicToConsumerChannelMap, id)
+	}
+}
+
+func (kp *KafkaMessagingProxy) getConsumerChannel(topic Topic) *consumerChannels {
+	kp.lockTopicToConsumerChannelMap.Lock()
+	defer kp.lockTopicToConsumerChannelMap.Unlock()
+
+	if consumerCh, exist := kp.topicToConsumerChannelMap[topic.Name]; exist {
+		return consumerCh
+	}
+	return nil
+}
+
+func (kp *KafkaMessagingProxy) addChannelToConsumerChannelMap(topic Topic, ch chan *ca.InterContainerMessage) {
+	kp.lockTopicToConsumerChannelMap.Lock()
+	defer kp.lockTopicToConsumerChannelMap.Unlock()
+	if consumerCh, exist := kp.topicToConsumerChannelMap[topic.Name]; exist {
+		consumerCh.channels = append(consumerCh.channels, ch)
+		return
+	}
+	log.Warnw("consumer-channel-not-exist", log.Fields{"topic": topic.Name})
+}
+
+func (kp *KafkaMessagingProxy) removeChannelFromConsumerChannelMap(topic Topic, ch <-chan *ca.InterContainerMessage) error {
+	kp.lockTopicToConsumerChannelMap.Lock()
+	defer kp.lockTopicToConsumerChannelMap.Unlock()
+	if consumerCh, exist := kp.topicToConsumerChannelMap[topic.Name]; exist {
+		// Channel will be closed in the removeChannel method
+		consumerCh.channels = removeChannel(consumerCh.channels, ch)
+		return nil
+	}
+	log.Warnw("topic-does-not-exist", log.Fields{"topic": topic.Name})
+	return errors.New("topic-does-not-exist")
+}
+
+func (kp *KafkaMessagingProxy) addToTransactionIdToChannelMap(id string, arg chan *ca.InterContainerMessage) {
+	kp.lockTransactionIdToChannelMap.Lock()
+	defer kp.lockTransactionIdToChannelMap.Unlock()
+	if _, exist := kp.transactionIdToChannelMap[id]; !exist {
+		kp.transactionIdToChannelMap[id] = arg
+	}
+}
+
+func (kp *KafkaMessagingProxy) deleteFromTransactionIdToChannelMap(id string) {
+	kp.lockTransactionIdToChannelMap.Lock()
+	defer kp.lockTransactionIdToChannelMap.Unlock()
+	if _, exist := kp.transactionIdToChannelMap[id]; exist {
+		delete(kp.transactionIdToChannelMap, id)
+	}
+}
+
+func (kp *KafkaMessagingProxy) createPublisher(retries int) error {
+	// This Creates the publisher
+	config := sarama.NewConfig()
+	config.Producer.Partitioner = sarama.NewRandomPartitioner
+	config.Producer.Flush.Frequency = time.Duration(DefaultFlushFrequency)
+	config.Producer.Flush.Messages = DefaultFlushMessages
+	config.Producer.Flush.MaxMessages = DefaultFlushMaxmessages
+	config.Producer.Return.Errors = DefaultReturnErrors
+	config.Producer.Return.Successes = DefaultReturnSuccess
+	config.Producer.RequiredAcks = sarama.WaitForAll
+	kafkaFullAddr := fmt.Sprintf("%s:%d", kp.KafkaHost, kp.KafkaPort)
+	brokers := []string{kafkaFullAddr}
+
+	for {
+		producer, err := sarama.NewAsyncProducer(brokers, config)
+		if err != nil {
+			if retries == 0 {
+				log.Errorw("error-starting-publisher", log.Fields{"error": err})
+				return err
+			} else {
+				// If retries is -ve then we will retry indefinitely
+				retries--
+			}
+			log.Info("retrying-after-a-second-delay")
+			time.Sleep(time.Duration(DefaultSleepOnError) * time.Second)
+		} else {
+			kp.producer = producer
+			break
+		}
+	}
+	log.Info("Kafka-publisher-created")
+	return nil
+}
+
+func (kp *KafkaMessagingProxy) createConsumer(retries int) error {
+	config := sarama.NewConfig()
+	config.Consumer.Return.Errors = true
+	config.Consumer.MaxWaitTime = time.Duration(DefaultConsumerMaxwait) * time.Millisecond
+	config.Consumer.MaxProcessingTime = time.Duration(DefaultMaxProcessingTime) * time.Millisecond
+	config.Consumer.Offsets.Initial = sarama.OffsetNewest
+	kafkaFullAddr := fmt.Sprintf("%s:%d", kp.KafkaHost, kp.KafkaPort)
+	brokers := []string{kafkaFullAddr}
+
+	for {
+		consumer, err := sarama.NewConsumer(brokers, config)
+		if err != nil {
+			if retries == 0 {
+				log.Errorw("error-starting-consumer", log.Fields{"error": err})
+				return err
+			} else {
+				// If retries is -ve then we will retry indefinitely
+				retries--
+			}
+			log.Info("retrying-after-a-second-delay")
+			time.Sleep(time.Duration(DefaultSleepOnError) * time.Second)
+		} else {
+			kp.consumer = consumer
+			break
+		}
+	}
+	log.Info("Kafka-consumer-created")
+	return nil
+}
+
+func encodeReturnedValue(request *ca.InterContainerMessage, returnedVal interface{}) (*any.Any, error) {
+	// Encode the response argument - needs to be a proto message
+	if returnedVal == nil {
+		return nil, nil
+	}
+	protoValue, ok := returnedVal.(proto.Message)
+	if !ok {
+		log.Warnw("response-value-not-proto-message", log.Fields{"error": ok, "returnVal": returnedVal})
+		err := errors.New("response-value-not-proto-message")
+		return nil, err
+	}
+
+	// Marshal the returned value, if any
+	var marshalledReturnedVal *any.Any
+	var err error
+	if marshalledReturnedVal, err = ptypes.MarshalAny(protoValue); err != nil {
+		log.Warnw("cannot-marshal-returned-val", log.Fields{"error": err})
+		return nil, err
+	}
+	return marshalledReturnedVal, nil
+}
+
+func encodeDefaultFailedResponse(request *ca.InterContainerMessage) *ca.InterContainerMessage {
+	responseHeader := &ca.Header{
+		Id:        request.Header.Id,
+		Type:      ca.MessageType_RESPONSE,
+		FromTopic: request.Header.ToTopic,
+		ToTopic:   request.Header.FromTopic,
+		Timestamp: time.Now().Unix(),
+	}
+	responseBody := &ca.InterContainerResponseBody{
+		Success: false,
+		Result:  nil,
+	}
+	var marshalledResponseBody *any.Any
+	var err error
+	// Error should never happen here
+	if marshalledResponseBody, err = ptypes.MarshalAny(responseBody); err != nil {
+		log.Warnw("cannot-marshal-failed-response-body", log.Fields{"error": err})
+	}
+
+	return &ca.InterContainerMessage{
+		Header: responseHeader,
+		Body:   marshalledResponseBody,
+	}
+
+}
+
+//formatRequest formats a request to send over kafka and returns an InterContainerMessage message on success
+//or an error on failure
+func encodeResponse(request *ca.InterContainerMessage, success bool, returnedValues ...interface{}) (*ca.InterContainerMessage, error) {
+
+	log.Infow("encodeResponse", log.Fields{"success": success, "returnedValues": returnedValues})
+	responseHeader := &ca.Header{
+		Id:        request.Header.Id,
+		Type:      ca.MessageType_RESPONSE,
+		FromTopic: request.Header.ToTopic,
+		ToTopic:   request.Header.FromTopic,
+		Timestamp: time.Now().Unix(),
+	}
+
+	// Go over all returned values
+	var marshalledReturnedVal *any.Any
+	var err error
+	for _, returnVal := range returnedValues {
+		if marshalledReturnedVal, err = encodeReturnedValue(request, returnVal); err != nil {
+			log.Warnw("cannot-marshal-response-body", log.Fields{"error": err})
+		}
+		break // for now we support only 1 returned value - (excluding the error)
+	}
+
+	responseBody := &ca.InterContainerResponseBody{
+		Success: success,
+		Result:  marshalledReturnedVal,
+	}
+
+	// Marshal the response body
+	var marshalledResponseBody *any.Any
+	if marshalledResponseBody, err = ptypes.MarshalAny(responseBody); err != nil {
+		log.Warnw("cannot-marshal-response-body", log.Fields{"error": err})
+		return nil, err
+	}
+
+	return &ca.InterContainerMessage{
+		Header: responseHeader,
+		Body:   marshalledResponseBody,
+	}, nil
+}
+
+func CallFuncByName(myClass interface{}, funcName string, params ...interface{}) (out []reflect.Value, err error) {
+	myClassValue := reflect.ValueOf(myClass)
+	m := myClassValue.MethodByName(funcName)
+	if !m.IsValid() {
+		return make([]reflect.Value, 0), fmt.Errorf("Method not found \"%s\"", funcName)
+	}
+	in := make([]reflect.Value, len(params))
+	for i, param := range params {
+		in[i] = reflect.ValueOf(param)
+	}
+	out = m.Call(in)
+	return
+}
+
+func (kp *KafkaMessagingProxy) handleRequest(msg *ca.InterContainerMessage, targetInterface interface{}) {
+
+	// First extract the header to know whether this is a request of a response
+	if msg.Header.Type == ca.MessageType_REQUEST {
+		log.Debugw("received-request", log.Fields{"header": msg.Header})
+
+		var out []reflect.Value
+		var err error
+
+		// Get the request body
+		requestBody := &ca.InterContainerRequestBody{}
+		if err = ptypes.UnmarshalAny(msg.Body, requestBody); err != nil {
+			log.Warnw("cannot-unmarshal-request", log.Fields{"error": err})
+		} else {
+			// let the callee unpack the arguments as its the only one that knows the real proto type
+			out, err = CallFuncByName(targetInterface, requestBody.Rpc, requestBody.Args)
+			if err != nil {
+				log.Warn(err)
+			}
+		}
+		// Response required?
+		if requestBody.ResponseRequired {
+			// If we already have an error before then just return that
+			var returnError *ca.Error
+			var returnedValues []interface{}
+			var success bool
+			if err != nil {
+				returnError = &ca.Error{Reason: err.Error()}
+				returnedValues = make([]interface{}, 1)
+				returnedValues[0] = returnError
+			} else {
+				log.Debugw("returned-api-response", log.Fields{"len": len(out), "err": err})
+				returnSize := 1 // Minimum array size
+				if len(out) > 1 {
+					returnSize = len(out) - 1
+				}
+				returnedValues = make([]interface{}, returnSize)
+				for idx, val := range out {
+					log.Debugw("returned-api-response-loop", log.Fields{"idx": idx, "val": val.Interface()})
+					if idx == 0 {
+						if val.Interface() != nil {
+							if goError, ok := out[0].Interface().(error); ok {
+								returnError = &ca.Error{Reason: goError.Error()}
+								returnedValues[0] = returnError
+							} // Else should never occur - maybe never say never?
+							break
+						} else {
+							success = true
+						}
+					} else {
+						returnedValues[idx-1] = val.Interface()
+					}
+				}
+			}
+
+			var icm *ca.InterContainerMessage
+			if icm, err = encodeResponse(msg, success, returnedValues...); err != nil {
+				log.Warnw("error-encoding-response-returning-failure-result", log.Fields{"erroe": err})
+				icm = encodeDefaultFailedResponse(msg)
+			}
+			kp.sendToKafkaTopic(icm, &Topic{Name: msg.Header.FromTopic})
+		}
+
+	} else if msg.Header.Type == ca.MessageType_RESPONSE {
+		log.Warnw("received-response-on-request-handler", log.Fields{"header": msg.Header})
+	} else {
+		log.Errorw("invalid-message", log.Fields{"header": msg.Header})
+	}
+}
+
+func (kp *KafkaMessagingProxy) waitForRequest(ch <-chan *ca.InterContainerMessage, topic Topic, targetInterface interface{}) {
+	//	Wait for messages
+	for msg := range ch {
+		log.Debugw("request-received", log.Fields{"msg": msg, "topic": topic.Name, "target": targetInterface})
+		go kp.handleRequest(msg, targetInterface)
+	}
+}
+
+// dispatchToConsumers sends the intercontainermessage received on a given topic to all subscribers for that
+// topic via the unique channel each subsciber received during subscription
+func (kp *KafkaMessagingProxy) dispatchToConsumers(consumerCh *consumerChannels, protoMessage *ca.InterContainerMessage) {
+	// Need to go over all channels and publish messages to them - do we need to copy msg?
+	kp.lockTopicToConsumerChannelMap.Lock()
+	defer kp.lockTopicToConsumerChannelMap.Unlock()
+	for _, ch := range consumerCh.channels {
+		go func(c chan *ca.InterContainerMessage) {
+			c <- protoMessage
+		}(ch)
+	}
+}
+
+func (kp *KafkaMessagingProxy) consumeMessagesLoop(topic Topic) {
+	log.Debugw("starting-consuming-messages", log.Fields{"topic": topic.Name})
+	var consumerCh *consumerChannels
+	if consumerCh = kp.getConsumerChannel(topic); consumerCh == nil {
+		log.Errorw("consumer-not-exist", log.Fields{"topic": topic.Name})
+		return
+	}
+startloop:
+	for {
+		select {
+		case err := <-consumerCh.consumer.Errors():
+			log.Warnw("consumer-error", log.Fields{"error": err})
+		case msg := <-consumerCh.consumer.Messages():
+			log.Debugw("message-received", log.Fields{"msg": msg})
+			// Since the only expected message is a proto intercontainermessage then extract it right away
+			// instead of dispatching it to the consumers
+			msgBody := msg.Value
+			icm := &ca.InterContainerMessage{}
+			if err := proto.Unmarshal(msgBody, icm); err != nil {
+				log.Warnw("invalid-message", log.Fields{"error": err})
+				continue
+			}
+			log.Debugw("msg-to-consumers", log.Fields{"msg": *icm, "len": len(consumerCh.channels)})
+
+			go kp.dispatchToConsumers(consumerCh, icm)
+		case <-kp.doneCh:
+			log.Infow("received-exit-signal", log.Fields{"topic": topic.Name})
+			break startloop
+		}
+	}
+}
+
+func (kp *KafkaMessagingProxy) dispatchResponse(msg *ca.InterContainerMessage) {
+	kp.lockTransactionIdToChannelMap.Lock()
+	defer kp.lockTransactionIdToChannelMap.Unlock()
+	if _, exist := kp.transactionIdToChannelMap[msg.Header.Id]; !exist {
+		log.Debugw("no-waiting-channel", log.Fields{"transaction": msg.Header.Id})
+		return
+	}
+	kp.transactionIdToChannelMap[msg.Header.Id] <- msg
+}
+
+func (kp *KafkaMessagingProxy) waitForResponse(ch chan *ca.InterContainerMessage, topic Topic) {
+	log.Debugw("starting-consuming-responses-loop", log.Fields{"topic": topic.Name})
+startloop:
+	for {
+		select {
+		case msg := <-ch:
+			log.Debugw("message-received", log.Fields{"topic": topic.Name, "msg": msg})
+			go kp.dispatchResponse(msg)
+			//	Need to handle program exit - TODO
+		case <-kp.doneCh:
+			log.Infow("received-exit-signal", log.Fields{"topic": topic.Name})
+			break startloop
+		}
+	}
+}
+
+// createConsumerChannel creates a consumerChannels object for that topic and add it to the consumerChannels map
+// for that topic.  It also starts the routine that listens for messages on that topic.
+func (kp *KafkaMessagingProxy) setupConsumerChannel(topic Topic) (chan *ca.InterContainerMessage, error) {
+
+	if consumerCh := kp.getConsumerChannel(topic); consumerCh != nil {
+		return nil, nil // Already created, so just ignore
+	}
+
+	partitionList, err := kp.consumer.Partitions(topic.Name)
+	if err != nil {
+		log.Warnw("get-partition-failure", log.Fields{"error": err, "topic": topic.Name})
+		return nil, err
+	}
+
+	log.Debugw("partitions", log.Fields{"topic": topic.Name, "partitionList": partitionList, "first": partitionList[0]})
+	// Create a partition consumer for that topic - for now just use one partition
+	var pConsumer sarama.PartitionConsumer
+	if pConsumer, err = kp.consumer.ConsumePartition(topic.Name, partitionList[0], sarama.OffsetNewest); err != nil {
+		log.Warnw("consumer-partition-failure", log.Fields{"error": err, "topic": topic.Name})
+		return nil, err
+	}
+
+	// Create the consumer/channel structure and set the consumer and create a channel on that topic - for now
+	// unbuffered to verify race conditions.
+	consumerListeningChannel := make(chan *ca.InterContainerMessage)
+	cc := &consumerChannels{
+		consumer: pConsumer,
+		channels: []chan *ca.InterContainerMessage{consumerListeningChannel},
+	}
+
+	// Add the consumer channel to the map
+	kp.addToTopicToConsumerChannelMap(topic.Name, cc)
+
+	//Start a consumer to listen on that specific topic
+	go kp.consumeMessagesLoop(topic)
+
+	return consumerListeningChannel, nil
+}
+
+// subscribeForResponse allows a caller to subscribe to a given topic when waiting for a response.
+// This method is built to prevent all subscribers to receive all messages as is the case of the Subscribe
+// API. There is one response channel waiting for kafka messages before dispatching the message to the
+// corresponding waiting channel
+func (kp *KafkaMessagingProxy) subscribeForResponse(topic Topic, trnsId string) (chan *ca.InterContainerMessage, error) {
+	log.Debugw("subscribeForResponse", log.Fields{"topic": topic.Name})
+
+	if consumerCh := kp.getConsumerChannel(topic); consumerCh == nil {
+		log.Debugw("topic-not-subscribed", log.Fields{"topic": topic.Name})
+		var consumerListeningChannel chan *ca.InterContainerMessage
+		var err error
+		if consumerListeningChannel, err = kp.setupConsumerChannel(topic); err != nil {
+			log.Warnw("create-consumer-channel-failure", log.Fields{"error": err, "topic": topic.Name})
+			return nil, err
+		}
+		// Start a go routine to listen to response messages over the consumer listening channel
+		go kp.waitForResponse(consumerListeningChannel, topic)
+	}
+
+	ch := make(chan *ca.InterContainerMessage)
+	kp.addToTransactionIdToChannelMap(trnsId, ch)
+
+	return ch, nil
+}
+
+func removeChannel(channels []chan *ca.InterContainerMessage, ch <-chan *ca.InterContainerMessage) []chan *ca.InterContainerMessage {
+	var i int
+	var channel chan *ca.InterContainerMessage
+	for i, channel = range channels {
+		if channel == ch {
+			channels[len(channels)-1], channels[i] = channels[i], channels[len(channels)-1]
+			close(channel)
+			return channels[:len(channels)-1]
+		}
+	}
+	return channels
+}
+
+func (kp *KafkaMessagingProxy) unSubscribeForResponse(trnsId string) error {
+	log.Debugw("unsubscribe-for-response", log.Fields{"trnsId": trnsId})
+	// Close the channel first
+	close(kp.transactionIdToChannelMap[trnsId])
+	kp.deleteFromTransactionIdToChannelMap(trnsId)
+	return nil
+}
+
+//formatRequest formats a request to send over kafka and returns an InterContainerMessage message on success
+//or an error on failure
+func encodeRequest(rpc string, toTopic *Topic, replyTopic *Topic, kvArgs ...*KVArg) (*ca.InterContainerMessage, error) {
+	requestHeader := &ca.Header{
+		Id:        uuid.New().String(),
+		Type:      ca.MessageType_REQUEST,
+		FromTopic: replyTopic.Name,
+		ToTopic:   toTopic.Name,
+		Timestamp: time.Now().Unix(),
+	}
+	requestBody := &ca.InterContainerRequestBody{
+		Rpc:              rpc,
+		ResponseRequired: true,
+		ReplyToTopic:     replyTopic.Name,
+	}
+
+	for _, arg := range kvArgs {
+		var marshalledArg *any.Any
+		var err error
+		// ascertain the value interface type is a proto.Message
+		protoValue, ok := arg.Value.(proto.Message)
+		if !ok {
+			log.Warnw("argument-value-not-proto-message", log.Fields{"error": ok, "Value": arg.Value})
+			err := errors.New("argument-value-not-proto-message")
+			return nil, err
+		}
+		if marshalledArg, err = ptypes.MarshalAny(protoValue); err != nil {
+			log.Warnw("cannot-marshal-request", log.Fields{"error": err})
+			return nil, err
+		}
+		protoArg := &ca.Argument{
+			Key:   arg.Key,
+			Value: marshalledArg,
+		}
+		requestBody.Args = append(requestBody.Args, protoArg)
+	}
+
+	var marshalledData *any.Any
+	var err error
+	if marshalledData, err = ptypes.MarshalAny(requestBody); err != nil {
+		log.Warnw("cannot-marshal-request", log.Fields{"error": err})
+		return nil, err
+	}
+	request := &ca.InterContainerMessage{
+		Header: requestHeader,
+		Body:   marshalledData,
+	}
+	return request, nil
+}
+
+// sendRequest formats and sends the request onto the kafka messaging bus.  It waits for the
+// response if needed.  This function must, therefore, be run in its own routine.
+func (kp *KafkaMessagingProxy) sendToKafkaTopic(msg *ca.InterContainerMessage, topic *Topic) {
+
+	//	Create the Sarama producer message
+	time := time.Now().Unix()
+	marshalled, _ := proto.Marshal(msg)
+	kafkaMsg := &sarama.ProducerMessage{
+		Topic: topic.Name,
+		Key:   sarama.StringEncoder(time),
+		Value: sarama.ByteEncoder(marshalled),
+	}
+
+	// Send message to kafka
+	kp.producer.Input() <- kafkaMsg
+
+}
+
+func decodeResponse(response *ca.InterContainerMessage) (*ca.InterContainerResponseBody, error) {
+	//	Extract the message body
+	responseBody := ca.InterContainerResponseBody{}
+
+	log.Debugw("decodeResponse", log.Fields{"icr": &response})
+	if err := ptypes.UnmarshalAny(response.Body, &responseBody); err != nil {
+		log.Warnw("cannot-unmarshal-response", log.Fields{"error": err})
+		return nil, err
+	}
+	log.Debugw("decodeResponse", log.Fields{"icrbody": &responseBody})
+
+	return &responseBody, nil
+
+}
diff --git a/kafka/kafka_inter_container_library_test.go b/kafka/kafka_inter_container_library_test.go
new file mode 100644
index 0000000..0fca49a
--- /dev/null
+++ b/kafka/kafka_inter_container_library_test.go
@@ -0,0 +1,74 @@
+package kafka
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+
+func TestDefaultKafkaProxy(t *testing.T) {
+	actualResult, error := NewKafkaMessagingProxy()
+	assert.Equal(t, error, nil)
+	assert.Equal(t, actualResult.KafkaHost, DefaultKafkaHost)
+	assert.Equal(t, actualResult.KafkaPort, DefaultKafkaPort)
+	assert.Equal(t, actualResult.TargetInterface, interface{}(nil))
+	assert.Equal(t, actualResult.DefaultTopic.Name, "Core")
+}
+
+func TestKafkaProxyOptionHost(t *testing.T) {
+	actualResult, error := NewKafkaMessagingProxy(KafkaHost("10.20.30.40"))
+	assert.Equal(t, error, nil)
+	assert.Equal(t, actualResult.KafkaHost, "10.20.30.40")
+	assert.Equal(t, actualResult.KafkaPort, DefaultKafkaPort)
+	assert.Equal(t, actualResult.TargetInterface, interface{}(nil))
+	assert.Equal(t, actualResult.DefaultTopic.Name, "Core")
+}
+
+func TestKafkaProxyOptionPort(t *testing.T) {
+	actualResult, error := NewKafkaMessagingProxy(KafkaPort(1020))
+	assert.Equal(t, error, nil)
+	assert.Equal(t, actualResult.KafkaHost, DefaultKafkaHost)
+	assert.Equal(t, actualResult.KafkaPort, 1020)
+	assert.Equal(t, actualResult.TargetInterface, interface{}(nil))
+	assert.Equal(t, actualResult.DefaultTopic.Name, "Core")
+}
+
+func TestKafkaProxyOptionTopic(t *testing.T) {
+	actualResult, error := NewKafkaMessagingProxy(DefaultTopic(&Topic{Name: "Adapter"}))
+	assert.Equal(t, error, nil)
+	assert.Equal(t, actualResult.KafkaHost, DefaultKafkaHost)
+	assert.Equal(t, actualResult.KafkaPort, DefaultKafkaPort)
+	assert.Equal(t, actualResult.TargetInterface, interface{}(nil))
+	assert.Equal(t, actualResult.DefaultTopic.Name, "Adapter")
+}
+
+type myInterface struct {
+}
+
+func (m *myInterface) doSomething() {
+}
+
+func TestKafkaProxyOptionTargetInterface(t *testing.T) {
+	var m *myInterface
+	actualResult, error := NewKafkaMessagingProxy(TargetInterface(m))
+	assert.Equal(t, error, nil)
+	assert.Equal(t, actualResult.KafkaHost, DefaultKafkaHost)
+	assert.Equal(t, actualResult.KafkaPort, DefaultKafkaPort)
+	assert.Equal(t, actualResult.TargetInterface, m)
+	assert.Equal(t, actualResult.DefaultTopic.Name, "Core")
+}
+
+func TestKafkaProxyChangeAllOptions(t *testing.T) {
+	var m *myInterface
+	actualResult, error := NewKafkaMessagingProxy(
+		KafkaHost("10.20.30.40"),
+		KafkaPort(1020),
+		DefaultTopic(&Topic{Name: "Adapter"}),
+		TargetInterface(m))
+	assert.Equal(t, error, nil)
+	assert.Equal(t, actualResult.KafkaHost, "10.20.30.40")
+	assert.Equal(t, actualResult.KafkaPort, 1020)
+	assert.Equal(t, actualResult.TargetInterface, m)
+	assert.Equal(t, actualResult.DefaultTopic.Name, "Adapter")
+}
+
diff --git a/kafka/messaging_interface.go b/kafka/messaging_interface.go
new file mode 100644
index 0000000..3511dc7
--- /dev/null
+++ b/kafka/messaging_interface.go
@@ -0,0 +1,30 @@
+package kafka
+
+import (
+	"context"
+)
+
+type callback func(bool, interface{})
+
+// A Topic definition - may be augmented with additional attributes eventually
+type Topic struct {
+	// The name of the topic. It must start with a letter,
+	// and contain only letters (`[A-Za-z]`), numbers (`[0-9]`), dashes (`-`),
+	// underscores (`_`), periods (`.`), tildes (`~`), plus (`+`) or percent
+	// signs (`%`).
+	Name string
+}
+
+type KVArg struct {
+	Key   string
+	Value interface{}
+}
+
+// Client represents the set of APIs a Messaging Client must implement - In progress
+type Client interface {
+	Start()
+	Stop()
+	Subscribe(ctx context.Context, topic *Topic, cb callback, targetInterfaces ...interface{})
+	Publish(ctx context.Context, rpc string, cb callback, topic *Topic, waitForResponse bool, kvArgs ...*KVArg)
+	Unsubscribe(ctx context.Context, topic *Topic)
+}
diff --git a/protos/adapter.proto b/protos/adapter.proto
new file mode 100644
index 0000000..fc1ec94
--- /dev/null
+++ b/protos/adapter.proto
@@ -0,0 +1,43 @@
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/voltha";
+
+package voltha;
+
+import "google/protobuf/any.proto";
+import "common.proto";
+import "meta.proto";
+
+
+message AdapterConfig {
+
+    // Common adapter config attributes here
+    LogLevel.LogLevel log_level = 1;
+
+    // Custom (vendor-specific) configuration attributes
+    google.protobuf.Any additional_config = 64;
+
+}
+
+// Adapter (software plugin)
+message Adapter {
+
+    // Unique name of adapter, matching the python packate name under
+    // voltha/adapters.
+    string id = 1 [(access) = READ_ONLY];
+    string vendor = 2 [(access) = READ_ONLY];
+    string version = 3 [(access) = READ_ONLY];
+
+    // Adapter configuration
+    AdapterConfig config = 16;
+
+    // Custom descriptors and custom configuration
+    google.protobuf.Any additional_description = 64 [(access) = READ_ONLY];
+
+    repeated string logical_device_ids = 4;  // Logical devices "owned"
+
+}
+
+message Adapters {
+    repeated Adapter items = 1;
+}
diff --git a/protos/common.proto b/protos/common.proto
new file mode 100644
index 0000000..4f9ea1e
--- /dev/null
+++ b/protos/common.proto
@@ -0,0 +1,110 @@
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/common";
+
+package voltha;
+
+import "yang_options.proto";
+
+// Convey a resource identifier
+message ID {
+    string id = 1;
+}
+
+message LogLevel {
+    option (yang_child_rule) = MOVE_TO_PARENT_LEVEL;
+
+    // Logging verbosity level
+    enum LogLevel {
+        DEBUG = 0;
+        INFO = 1;
+        WARNING = 2;
+        ERROR = 3;
+        CRITICAL = 4;
+    }
+}
+
+message AdminState {
+    option (yang_child_rule) = MOVE_TO_PARENT_LEVEL;
+
+    // Administrative State
+    enum AdminState {
+
+        // The administrative state of the device is unknown
+        UNKNOWN = 0;
+
+        // The device is pre-provisioned into Voltha, but not contacted by it
+        PREPROVISIONED = 1;
+
+        // The device is enabled for activation and operation
+        ENABLED = 3;
+
+        // The device is disabled and shall not perform its intended forwarding
+        // functions other than being available for re-activation.
+        DISABLED = 2;
+
+        // The deive is in the state of image download
+        DOWNLOADING_IMAGE = 4;
+
+    }
+}
+
+message OperStatus {
+    option (yang_child_rule) = MOVE_TO_PARENT_LEVEL;
+
+    // Operational Status
+    enum OperStatus {
+
+        // The status of the device is unknown at this point
+        UNKNOWN = 0;
+
+        // The device has been discovered, but not yet activated
+        DISCOVERED = 1;
+
+        // The device is being activated (booted, rebooted, upgraded, etc.)
+        ACTIVATING = 2;
+
+        // Service impacting tests are being conducted
+        TESTING = 3;
+
+        // The device is up and active
+        ACTIVE = 4;
+
+        // The device has failed and cannot fulfill its intended role
+        FAILED = 5;
+    }
+}
+
+message ConnectStatus {
+    option (yang_child_rule) = MOVE_TO_PARENT_LEVEL;
+
+    // Connectivity Status
+    enum ConnectStatus {
+
+        // The device connectivity status is unknown
+        UNKNOWN = 0;
+
+        // The device cannot be reached by Voltha
+        UNREACHABLE = 1;
+
+        // There is live communication between device and Voltha
+        REACHABLE = 2;
+    }
+}
+
+message OperationResp {
+    option (yang_child_rule) = MOVE_TO_PARENT_LEVEL;
+
+    enum OperationReturnCode {
+        OPERATION_SUCCESS = 0;
+        OPERATION_FAILURE = 1;
+        OPERATION_UNSUPPORTED = 2;
+    }
+    // Return code
+    OperationReturnCode code = 1;
+
+    // Additional Info
+    string additional_info = 2;
+}
+
+
diff --git a/protos/core_adapter.proto b/protos/core_adapter.proto
new file mode 100644
index 0000000..5021b9a
--- /dev/null
+++ b/protos/core_adapter.proto
@@ -0,0 +1,58 @@
+syntax = "proto3";
+
+import "google/protobuf/any.proto";
+
+option go_package = "github.com/opencord/voltha-go/protos/core_adapter";
+
+package voltha;
+
+message StrType {
+    string val = 1;
+}
+
+message IntType {
+    int64 val = 1;
+}
+
+message BoolType {
+    bool val = 1;
+}
+
+message Error {
+    string reason = 1;
+}
+
+enum MessageType {
+    REQUEST = 0;
+    RESPONSE = 1;
+}
+
+message Header {
+    string id = 1;
+    MessageType type = 2;
+    string from_topic = 3;
+    string to_topic = 4;
+    int64 timestamp = 5;
+}
+
+message Argument {
+    string key = 1;
+    google.protobuf.Any value = 2;
+}
+
+message InterContainerMessage {
+    Header header = 1;
+    google.protobuf.Any body = 2;
+}
+
+message InterContainerRequestBody {
+    string rpc = 2;
+    repeated Argument args = 3;
+    bool response_required = 4;
+    string reply_to_topic = 5;
+}
+
+message InterContainerResponseBody {
+    bool success = 1;
+    google.protobuf.Any result = 3;
+}
diff --git a/protos/device.proto b/protos/device.proto
new file mode 100644
index 0000000..f991e44
--- /dev/null
+++ b/protos/device.proto
@@ -0,0 +1,296 @@
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/voltha";
+
+package voltha;
+
+import "meta.proto";
+import "google/protobuf/any.proto";
+import "common.proto";
+import "openflow_13.proto";
+import "yang_options.proto";
+
+
+// A Device Type
+message DeviceType {
+
+    // Unique name for the device type
+    string id = 1;
+
+    // Unique venor id for the device type applicable to ONU
+    // 4 bytes of vendor id from ONU serial number
+    string vendor_id = 5;
+
+    repeated string vendor_ids = 6;
+
+    // Name of the adapter that handles device type
+    string adapter = 2;
+
+    // Capabilitities
+
+    bool accepts_bulk_flow_update = 3;
+    bool accepts_add_remove_flow_updates = 4;
+
+}
+
+// A plurality of device types
+message DeviceTypes {
+    repeated DeviceType items = 1;
+}
+
+message PmConfig {
+    enum PmType {
+    	COUNTER = 0;
+	GUAGE = 1;
+	STATE = 2;
+    }
+    string name = 1;
+    PmType type = 2;
+    bool enabled = 3; // Whether or not this metric makes it to Kafka
+    uint32 sample_freq = 4; // Sample rate in 10ths of a second
+}
+
+message PmGroupConfig {
+    string group_name = 1;
+    uint32 group_freq = 2; // Frequency applicable to the grop
+    bool enabled = 3; // Enable/disable group level only
+    repeated PmConfig metrics = 4;
+}
+
+message PmConfigs {
+    string id = 1; // To work around a chameleon POST bug
+    uint32 default_freq = 2; // Default sample rate
+    // Forces group names and group semantics
+    bool grouped = 3 [(access) = READ_ONLY];
+    // Allows Pm to set an individual sample frequency
+    bool freq_override = 4 [(access) = READ_ONLY];
+    repeated PmGroupConfig groups = 5; // The groups if grouped is true
+    repeated PmConfig metrics = 6; // The metrics themselves if grouped is false.
+}
+
+// Describes instance of software image on the device
+message Image {
+    string name = 1;                // software patch name
+    string version = 2;             // version of software
+    string hash = 3;                // md5 hash
+    string install_datetime = 4;    // combined date and time expressed in UTC.
+                                    // use ISO 8601 format for date and time
+
+    // The active software image is one that is currently loaded and executing
+    // in the ONU or circuit pack. Under normal operation, one software image
+    // is always active while the other is inactive. Under no circumstances are
+    // both software images allowed to be active at the same time
+    bool is_active = 5;             // True if the image is active
+
+    // The committed software image is loaded and executed upon reboot of the
+    // ONU and/or circuit pack. During normal operation, one software image is
+    // always committed, while the other is uncommitted.
+    bool is_committed = 6;          // True if the image is committed
+
+    // A software image is valid if it has been verified to be an executable
+    // code image. The verification mechanism is not subject to standardization;
+    // however, it should include at least a data integrity (e.g., CRC) check of
+    // the entire code image.
+    bool is_valid = 7;              // True if the image is valid
+}
+
+// List of software on the device
+message Images {
+    repeated Image image = 1;
+}
+
+message ImageDownload {
+    option (yang_child_rule) = MOVE_TO_PARENT_LEVEL;
+
+    enum ImageDownloadState {
+        DOWNLOAD_UNKNOWN = 0;
+        DOWNLOAD_SUCCEEDED = 1;
+        DOWNLOAD_REQUESTED = 2;
+        DOWNLOAD_STARTED = 3;
+        DOWNLOAD_FAILED = 4;
+        DOWNLOAD_UNSUPPORTED = 5;
+    }
+
+    enum ImageDownloadFailureReason {
+        NO_ERROR = 0;
+        INVALID_URL = 1;
+        DEVICE_BUSY = 2;
+        INSUFFICIENT_SPACE = 3;
+        UNKNOWN_ERROR = 4;
+    }
+
+    enum ImageActivateState {
+        IMAGE_UNKNOWN = 0;
+        IMAGE_INACTIVE = 1;
+        IMAGE_ACTIVATE = 2;
+        IMAGE_ACTIVE = 3;
+        IMAGE_REVERT = 4;
+    }
+
+    // Device Identifier
+    string id = 1;
+
+    // Image unique identifier
+    string name = 2;
+
+    // URL where the image is available
+    // should include username password
+    string url = 3;
+
+    // CRC of the image to be verified aginst
+    uint32 crc = 4;
+
+    // Download state
+    ImageDownloadState state = 5;
+
+    // Downloaded version
+    string image_version = 6;
+
+    // Bytes downloaded
+    uint32 downloaded_bytes = 7;
+
+    // Download failure reason
+    ImageDownloadFailureReason reason= 8;
+
+    // Additional info
+    string additional_info = 9;
+
+    // Save current configuration
+    bool save_config = 10;
+
+    // Image local location
+    string local_dir = 11;
+
+    // Image activation state
+    ImageActivateState image_state = 12;
+}
+
+message ImageDownloads {
+    repeated ImageDownload items = 2;
+}
+
+message Port {
+    option (voltha.yang_child_rule) = MOVE_TO_PARENT_LEVEL;
+
+    enum PortType {
+        UNKNOWN = 0;
+        ETHERNET_NNI = 1;
+        ETHERNET_UNI = 2;
+        PON_OLT = 3;
+        PON_ONU = 4;
+        VENET_OLT = 5;
+        VENET_ONU = 6;
+    }
+
+    uint32 port_no = 1;  // Device-unique port number
+
+    string label = 2;  // Arbitrary port label
+
+    PortType type = 3;  //  Type of port
+
+    AdminState.AdminState admin_state = 5;
+
+    OperStatus.OperStatus oper_status = 6;
+
+    string device_id = 7;  // Unique .id of device that owns this port
+
+    message PeerPort {
+        string device_id = 1;
+        uint32 port_no = 2;
+    }
+    repeated PeerPort peers = 8;
+
+}
+
+message Ports {
+    repeated Port items = 1;
+}
+
+// A Physical Device instance
+message Device {
+    option (voltha.yang_child_rule) = MOVE_TO_PARENT_LEVEL;
+
+    // Voltha's device identifier
+    string id = 1 [(access) = READ_ONLY];
+
+    // Device type, refers to one of the registered device types
+    string type = 2 [(access) = READ_ONLY];
+
+    // Is this device a root device. Each logical switch has one root
+    // device that is associated with the logical flow switch.
+    bool root = 3 [(access) = READ_ONLY];
+
+    // Parent device id, in the device tree (for a root device, the parent_id
+    // is the logical_device.id)
+    string parent_id = 4 [(access) = READ_ONLY];
+    uint32 parent_port_no = 20 [(access) = READ_ONLY];
+
+    // Vendor, version, serial number, etc.
+    string vendor = 5 [(access) = READ_ONLY];
+    string model = 6 [(access) = READ_ONLY];
+    string hardware_version = 7 [(access) = READ_ONLY];
+    string firmware_version = 8 [(access) = READ_ONLY];
+    // List of software on the device
+    Images images = 9 [(access) = READ_ONLY];
+    string serial_number = 10 [(access) = READ_ONLY];
+    string vendor_id = 24 [(access) = READ_ONLY];
+
+    // Addapter that takes care of device
+    string adapter = 11 [(access) = READ_ONLY];
+
+    // Device contact on vlan (if 0, no vlan)
+    uint32 vlan = 12;
+
+    message ProxyAddress {
+        string device_id = 1;  // Which device to use as proxy to this device
+        uint32 channel_id = 2;  // Sub-address within proxy
+        uint32 channel_group_id = 5; // Channel Group index
+        string channel_termination = 6; // Channel Termination name
+        uint32 onu_id = 3; // onu identifier; optional
+        uint32 onu_session_id = 4; // session identifier for the ONU; optional
+    };
+
+    oneof address {
+        // Device contact MAC address (format: "xx:xx:xx:xx:xx:xx")
+        string mac_address = 13;
+
+        // Device contact IPv4 address (format: "a.b.c.d" or can use hostname too)
+        string ipv4_address = 14;
+
+        // Device contact IPv6 address using the canonical string form
+        // ("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx")
+        string ipv6_address = 15;
+
+        string host_and_port = 21;
+
+    };
+    string extra_args = 23;  // Used to pass additional device specific arguments
+
+    ProxyAddress proxy_address = 19;
+
+    AdminState.AdminState admin_state = 16;
+
+    OperStatus.OperStatus oper_status = 17 [(access) = READ_ONLY];
+
+    string reason = 22 [(access) = READ_ONLY];  //  Used in FAILED state
+
+    ConnectStatus.ConnectStatus connect_status = 18 [(access) = READ_ONLY];
+
+    // TODO additional common attribute here
+
+    // Device type specific attributes
+    google.protobuf.Any custom = 64;
+
+    repeated Port ports = 128  [(child_node) = {key: "port_no"}];
+    openflow_13.Flows flows = 129 [(child_node) = {}];
+    openflow_13.FlowGroups flow_groups = 130 [(child_node) = {}];
+    // PmConfigs will eventually converted to a child node of the
+    // device to falicitata callbacks and to simplify manipulation.
+    PmConfigs pm_configs = 131 [(child_node) = {}];
+
+    repeated ImageDownload image_downloads = 133 [(child_node) = {key: "name"}];
+}
+
+message Devices {
+    repeated Device items = 1;
+}
diff --git a/protos/events.proto b/protos/events.proto
new file mode 100644
index 0000000..27fd5cd
--- /dev/null
+++ b/protos/events.proto
@@ -0,0 +1,140 @@
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/voltha";
+
+package voltha;
+
+import "meta.proto";
+import "google/api/annotations.proto";
+
+message ConfigEventType {
+    enum ConfigEventType {
+        add = 0; // A new config has been added
+        remove = 1; // A config has been removed
+        update = 2; // A config has been updated
+    }
+}
+
+message ConfigEvent {
+    ConfigEventType.ConfigEventType type = 1;
+
+    string hash = 2; // hash for this change, can be used for quick lookup
+    string data = 3; // the actual new data, in json format
+}
+
+message KpiEventType {
+    enum KpiEventType {
+        slice = 0; // slice: a set of path/metric data for same time-stamp
+        ts = 1; // time-series: array of data for same metric
+    }
+}
+
+/*
+ * Struct to convey a dictionary of metric->value pairs. Typically used in
+ * pure shared-timestamp or shared-timestamp + shared object prefix situations.
+ */
+message MetricValuePairs {
+
+    // Metric / value pairs.
+    map<string, float> metrics = 1;
+
+}
+
+
+message KpiEvent {
+
+    KpiEventType.KpiEventType type = 1;
+
+    // Fields used when for slice:
+
+    float ts = 2; // UTC time-stamp of data in slice mode (seconds since epoc)
+
+    map<string, MetricValuePairs> prefixes = 3;
+
+}
+
+/*
+ * Identify to the area of the system impacted by the alarm
+ */
+message AlarmEventType {
+    enum AlarmEventType {
+        COMMUNICATION = 0;
+        ENVIRONMENT = 1;
+        EQUIPMENT = 2;
+        SERVICE = 3;
+        PROCESSING = 4;
+        SECURITY = 5;
+    }
+}
+
+/*
+ * Identify to the functional category originating the alarm
+ */
+message AlarmEventCategory {
+    enum AlarmEventCategory {
+        PON = 0;
+        OLT = 1;
+        ONT = 2;
+    }
+}
+
+/*
+ * Active state of the alarm
+ */
+message AlarmEventState {
+    enum AlarmEventState {
+        RAISED = 0;
+        CLEARED = 1;
+    }
+}
+
+/*
+ * Identify the overall impact of the alarm on the system
+ */
+message AlarmEventSeverity {
+    enum AlarmEventSeverity {
+        INDETERMINATE = 0;
+        WARNING = 1;
+        MINOR = 2;
+        MAJOR = 3;
+        CRITICAL = 4;
+    }
+}
+
+/*
+ *
+ */
+message AlarmEvent {
+    // Unique ID for this alarm.  e.g. voltha.some_olt.1234
+    string id = 1;
+
+    // Refers to the area of the system impacted by the alarm
+    AlarmEventType.AlarmEventType type = 2;
+
+    // Refers to functional category of the alarm
+    AlarmEventCategory.AlarmEventCategory category = 3;
+
+    // Current active state of the alarm
+    AlarmEventState.AlarmEventState state = 4;
+
+    // Overall impact of the alarm on the system
+    AlarmEventSeverity.AlarmEventSeverity severity = 5;
+
+    // Timestamp at which the alarm was first raised
+    float raised_ts = 6;
+
+    // Timestamp at which the alarm was reported
+    float reported_ts = 7;
+
+    // Timestamp at which the alarm has changed since it was raised
+    float changed_ts = 8;
+
+    // Identifier of the originating resource of the alarm
+    string resource_id = 9;
+
+    // Textual explanation of the alarm
+    string description = 10;
+
+    // Key/Value storage for extra information that may give context to the alarm
+    map<string, string> context = 11;
+}
diff --git a/protos/health.proto b/protos/health.proto
new file mode 100644
index 0000000..0730eac
--- /dev/null
+++ b/protos/health.proto
@@ -0,0 +1,36 @@
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/voltha";
+
+package voltha;
+
+import "google/api/annotations.proto";
+import "google/protobuf/empty.proto";
+import "meta.proto";
+
+// Encode health status of a Voltha instance
+message HealthStatus {
+
+    // Health states
+    enum HealthState {
+        HEALTHY = 0;  // The instance is healthy
+        OVERLOADED = 1;  // The instance is overloaded, decrease query rate
+        DYING = 2;  // The instance is in a critical condition, do not use it
+    }
+
+    // Current state of health of this Voltha instance
+    HealthState state = 1 [(access) = READ_ONLY];
+}
+
+// Health related services
+service HealthService {
+
+    // Return current health status of a Voltha instance
+    rpc GetHealthStatus(google.protobuf.Empty) returns (HealthStatus) {
+        option (google.api.http) = {
+            get: "/health"
+        };
+    }
+
+}
+
diff --git a/protos/ietf_interfaces.proto b/protos/ietf_interfaces.proto
new file mode 100644
index 0000000..d43c02d
--- /dev/null
+++ b/protos/ietf_interfaces.proto
@@ -0,0 +1,53 @@
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/ietf";
+
+package ietf_interfaces;
+
+message Interfaces {
+    repeated Interface all_interfaces = 1;
+}
+message Interface {
+    string name = 1 ;
+    string description = 2 ;
+    string type = 3 ;
+    bool enabled = 4;
+    enum LinkUpDownTrapEnableType
+    {
+        TRAP_DISABLED = 0 ;
+        TRAP_ENABLED = 1 ;
+    }
+    LinkUpDownTrapEnableType link_up_down_trap_enable = 5;
+}
+
+message InterfacesState {
+    repeated InterfaceState all_interfacs = 1;
+}
+message InterfaceState {
+    string name = 1 ;
+    string type = 2 ;
+    enum AdminStatusType
+    {
+        ADMIN_DOWN = 0 ;
+        ADMIN_TESTING = 1 ;
+        ADMIN_UP = 2 ;
+    }
+    AdminStatusType admin_status = 3;
+    enum OperStatusType
+    {
+        DORMANT = 0 ;
+        LOWER_LAYER_DOWN = 1 ;
+        UNKNOWN = 2 ;
+        TESTING = 3 ;
+        UP = 4 ;
+        DOWN = 5 ;
+        NOT_PRESENT = 6 ;
+    }
+    OperStatusType oper_status = 4;
+    string last_change = 5 ;
+    int32 if_index = 6 ;
+    string phys_address = 7 ;
+    repeated string higher_layer_if = 8 ;
+    repeated string lower_layer_if = 9 ;
+    uint64 speed = 10 ;
+}
diff --git a/protos/logical_device.proto b/protos/logical_device.proto
new file mode 100644
index 0000000..b8d424f
--- /dev/null
+++ b/protos/logical_device.proto
@@ -0,0 +1,61 @@
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/voltha";
+
+package voltha;
+
+import "meta.proto";
+import "google/api/annotations.proto";
+import "openflow_13.proto";
+
+message LogicalPortId {
+    // unique id of logical device
+    string id = 1;
+
+    // id of the port on the logical device
+    string port_id = 2;
+}
+
+message LogicalPort {
+    string id = 1;
+    openflow_13.ofp_port ofp_port = 2;
+    string device_id = 3;
+    uint32 device_port_no = 4;
+    bool root_port = 5;
+}
+
+message LogicalPorts {
+    repeated LogicalPort items = 1;
+}
+
+message LogicalDevice {
+
+    // unique id of logical device
+    string id = 1;
+
+    // unique datapath id for the logical device (used by the SDN controller)
+    uint64 datapath_id = 2;
+
+    // device description
+    openflow_13.ofp_desc desc = 3;
+
+    // device features
+    openflow_13.ofp_switch_features switch_features = 4;
+
+    // name of the root device anchoring logical device
+    string root_device_id = 5;
+
+    // logical device ports
+    repeated LogicalPort ports = 128 [(child_node) = {key: "id"}];
+
+    // flows configured on the logical device
+    openflow_13.Flows flows = 129 [(child_node) = {}];
+
+    // flow groups configured on the logical device
+    openflow_13.FlowGroups flow_groups = 130 [(child_node) = {}];
+
+}
+
+message LogicalDevices {
+    repeated LogicalDevice items = 1;
+}
diff --git a/protos/meta.proto b/protos/meta.proto
new file mode 100644
index 0000000..fc02e46
--- /dev/null
+++ b/protos/meta.proto
@@ -0,0 +1,57 @@
+// Copyright (c) 2015, Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file contains annotation definitions that can be used to describe
+// a configuration tree.
+
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/common";
+
+package voltha;
+
+import "google/protobuf/descriptor.proto";
+
+message ChildNode {
+    string key = 1;
+}
+
+enum Access {
+
+    // read-write, stored attribute
+    CONFIG = 0;
+
+    // read-only field, stored with the model, covered by its hash
+    READ_ONLY = 1;
+
+    // A read-only attribute that is not stored in the model, not covered
+    // by its hash, its value is filled real-time upon each request.
+    REAL_TIME = 2;
+
+}
+
+extend google.protobuf.FieldOptions {
+
+    // If present, it indicates that this field is stored as external child node
+    // or children nodes in Voltha's internal configuration tree.
+    // If the field is a container field and if the option specifies a key
+    // the child objects will be addressible by that key.
+    ChildNode child_node = 7761772;
+
+    // This annotation can be used to indicate that a field is read-only,
+    // from the perspective of NBI access. Backend plugins and system
+    // internals can update the field but the update requests through the
+    // NBI will ignore for instance a field that is marked as read-only (RO).
+    Access access = 7761773;
+}
diff --git a/protos/omci_mib_db.proto b/protos/omci_mib_db.proto
new file mode 100644
index 0000000..f8fe157
--- /dev/null
+++ b/protos/omci_mib_db.proto
@@ -0,0 +1,55 @@
+//
+// Copyright 2018 - present the original author or authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/omci";
+
+package omci;
+
+import "meta.proto";
+
+
+message MibAttributeData {
+    string name        = 1 [(voltha.access) = READ_ONLY];
+    string value       = 2;
+}
+
+message MibInstanceData {
+    uint32 instance_id      = 1 [(voltha.access) = READ_ONLY];
+    string created          = 2;
+    string modified         = 3;
+
+    repeated MibAttributeData attributes = 4
+    [(voltha.child_node) = {key: "name"}];
+}
+
+message MibClassData {
+    uint32 class_id         = 1 [(voltha.access) = READ_ONLY];
+
+    repeated MibInstanceData instances= 2
+    [(voltha.child_node) = {key: "instance_id"}];
+}
+
+message MibDeviceData {
+    string device_id        = 1 [(voltha.access) = READ_ONLY];
+    string created          = 2;
+    string last_sync_time   = 3;
+    uint32 mib_data_sync    = 4;
+    uint32 version          = 5;
+
+    repeated MibClassData classes = 6
+    [(voltha.child_node) = {key: "class_id"}];
+}
diff --git a/protos/openflow_13.proto b/protos/openflow_13.proto
new file mode 100644
index 0000000..47d881b
--- /dev/null
+++ b/protos/openflow_13.proto
@@ -0,0 +1,2298 @@
+/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
+ * Junior University
+ * Copyright (c) 2011, 2012 Open Networking Foundation
+ *
+ * We are making the OpenFlow specification and associated documentation
+ * (Software) available for public use and benefit with the expectation
+ * that others will use, modify and enhance the Software and contribute
+ * those enhancements back to the community. However, since we would
+ * like to make the Software available for broadest use, with as few
+ * restrictions as possible permission is hereby granted, free of
+ * charge, to any person obtaining a copy of this Software to deal in
+ * the Software under the copyrights without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * The name and trademarks of copyright holder(s) may NOT be used in
+ * advertising or publicity pertaining to the Software or any
+ * derivatives without specific, written prior permission.
+ */
+
+/* OpenFlow: protocol between controller and datapath. */
+
+/*
+ * This is a relatively straightforward rendering of OpenFlow message
+ * definitions into protocol buffer messages. We preserved the snake
+ * case syntax, and made the following changes:
+ * - all pad fields dropped
+ * - for each enum value above 0x7fffffff the MSB is dropped. For example,
+ *   0xffffffff is now 0x7fffffff.
+ * - '<type> thing[...]' is replaced with 'repeated <type> thing'
+ * - 'char thing[...]' is replaced with 'string thing'
+ * - 'uint8_t data[...]' is replaced with 'bytes data'
+ * - the following systematic changes are done to various integer types:
+ *   uint8_t  -> uint32
+ *   uint16_t -> uint32
+ *   uint32_t -> uint32
+ *   uint64_t -> uint64
+ * - removed most length, len, size fields where these values can be determined
+ *   from the explicitly encoded length of "repeated" protobuf fields.
+ * - explicit use of enum types whereever it is unambigous (and not used as
+ *   bitmask/flags value.
+ *
+ */
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/openflow_13";
+
+package openflow_13;
+
+import "google/api/annotations.proto";
+import public "yang_options.proto";
+
+
+/* Version number:
+ * OpenFlow versions released: 0x01 = 1.0 ; 0x02 = 1.1 ; 0x03 = 1.2
+ *     0x04 = 1.3
+ */
+/* The most significant bit in the version field is reserved and must
+ * be set to zero.
+ */
+//#define OFP_VERSION   0x04
+//#define PIPELINE_TABLES 64
+//#define OFP_MAX_TABLE_NAME_LEN 32
+//#define OFP_MAX_PORT_NAME_LEN  16
+/* Official IANA registered port for OpenFlow. */
+//#define OFP_TCP_PORT  6653
+//#define OFP_SSL_PORT  6653
+
+//#define OFP_ETH_ALEN 6          /* Bytes in an Ethernet address. */
+
+/* Port numbering. Ports are numbered starting from 1. */
+enum ofp_port_no {
+    OFPP_INVALID    = 0;
+
+    /* Maximum number of physical and logical switch ports. */
+    OFPP_MAX        = 0x7fffff00;
+
+    /* Reserved OpenFlow Port (fake output "ports"). */
+    OFPP_IN_PORT    = 0x7ffffff8;  /* Send the packet out the input port.  This
+                                      reserved port must be explicitly used
+                                      in order to send back out of the input
+                                      port. */
+    OFPP_TABLE      = 0x7ffffff9;  /* Submit the packet to the first flow table
+                                      NB: This destination port can only be
+                                      used in packet-out messages. */
+    OFPP_NORMAL     = 0x7ffffffa;  /* Forward using non-OpenFlow pipeline. */
+    OFPP_FLOOD      = 0x7ffffffb;  /* Flood using non-OpenFlow pipeline. */
+    OFPP_ALL        = 0x7ffffffc;  /* All standard ports except input port. */
+    OFPP_CONTROLLER = 0x7ffffffd;  /* Send to controller. */
+    OFPP_LOCAL      = 0x7ffffffe;  /* Local openflow "port". */
+    OFPP_ANY        = 0x7fffffff;  /* Special value used in some requests when
+                                      no port is specified (i.e. wildcarded).*/
+};
+
+enum ofp_type {
+
+    /* Immutable messages. */
+    OFPT_HELLO                      = 0;  /* Symmetric message */
+    OFPT_ERROR                      = 1;  /* Symmetric message */
+    OFPT_ECHO_REQUEST               = 2;  /* Symmetric message */
+    OFPT_ECHO_REPLY                 = 3;  /* Symmetric message */
+    OFPT_EXPERIMENTER               = 4;  /* Symmetric message */
+
+    /* Switch configuration messages. */
+    OFPT_FEATURES_REQUEST           = 5;  /* Controller/switch message */
+    OFPT_FEATURES_REPLY             = 6;  /* Controller/switch message */
+    OFPT_GET_CONFIG_REQUEST         = 7;  /* Controller/switch message */
+    OFPT_GET_CONFIG_REPLY           = 8;  /* Controller/switch message */
+    OFPT_SET_CONFIG                 = 9;  /* Controller/switch message */
+
+    /* Asynchronous messages. */
+    OFPT_PACKET_IN                  = 10; /* Async message */
+    OFPT_FLOW_REMOVED               = 11; /* Async message */
+    OFPT_PORT_STATUS                = 12; /* Async message */
+
+    /* Controller command messages. */
+    OFPT_PACKET_OUT                 = 13; /* Controller/switch message */
+    OFPT_FLOW_MOD                   = 14; /* Controller/switch message */
+    OFPT_GROUP_MOD                  = 15; /* Controller/switch message */
+    OFPT_PORT_MOD                   = 16; /* Controller/switch message */
+    OFPT_TABLE_MOD                  = 17; /* Controller/switch message */
+
+    /* Multipart messages. */
+    OFPT_MULTIPART_REQUEST          = 18; /* Controller/switch message */
+    OFPT_MULTIPART_REPLY            = 19; /* Controller/switch message */
+
+    /* Barrier messages. */
+    OFPT_BARRIER_REQUEST            = 20; /* Controller/switch message */
+    OFPT_BARRIER_REPLY              = 21; /* Controller/switch message */
+
+    /* Queue Configuration messages. */
+    OFPT_QUEUE_GET_CONFIG_REQUEST   = 22;  /* Controller/switch message */
+    OFPT_QUEUE_GET_CONFIG_REPLY     = 23;  /* Controller/switch message */
+
+    /* Controller role change request messages. */
+    OFPT_ROLE_REQUEST               = 24; /* Controller/switch message */
+    OFPT_ROLE_REPLY                 = 25; /* Controller/switch message */
+
+    /* Asynchronous message configuration. */
+    OFPT_GET_ASYNC_REQUEST          = 26; /* Controller/switch message */
+    OFPT_GET_ASYNC_REPLY            = 27; /* Controller/switch message */
+    OFPT_SET_ASYNC                  = 28; /* Controller/switch message */
+
+    /* Meters and rate limiters configuration messages. */
+    OFPT_METER_MOD                  = 29; /* Controller/switch message */
+};
+
+/* Header on all OpenFlow packets. */
+message ofp_header {
+    uint32 version = 1;    /* OFP_VERSION. */
+    ofp_type type = 2;     /* One of the OFPT_ constants. */
+    uint32 xid = 3;        /* Transaction id associated with this packet.
+                              Replies use the same id as was in the request
+                              to facilitate pairing. */
+};
+
+/* Hello elements types.
+ */
+enum ofp_hello_elem_type {
+    OFPHET_INVALID                = 0;
+    OFPHET_VERSIONBITMAP          = 1;  /* Bitmap of version supported. */
+};
+
+/* Common header for all Hello Elements */
+message ofp_hello_elem_header {
+    ofp_hello_elem_type type = 1;       /* One of OFPHET_*. */
+    oneof element {
+        ofp_hello_elem_versionbitmap versionbitmap = 2;
+    }
+};
+
+/* Version bitmap Hello Element */
+message ofp_hello_elem_versionbitmap {
+    repeated uint32 bitmaps = 2;   /* List of bitmaps - supported versions */
+};
+
+/* OFPT_HELLO.  This message includes zero or more hello elements having
+ * variable size. Unknown elements types must be ignored/skipped, to allow
+ * for future extensions. */
+message ofp_hello {
+    //ofp_header header;
+    /* Hello element list */
+    repeated ofp_hello_elem_header elements = 1; /* 0 or more */
+};
+
+//#define OFP_DEFAULT_MISS_SEND_LEN   128
+
+enum ofp_config_flags {
+    /* Handling of IP fragments. */
+    OFPC_FRAG_NORMAL   = 0;       /* No special handling for fragments. */
+    OFPC_FRAG_DROP     = 1;       /* Drop fragments. */
+    OFPC_FRAG_REASM    = 2;       /* Reassemble (only if OFPC_IP_REASM set). */
+    OFPC_FRAG_MASK     = 3;       /* Bitmask of flags dealing with frag. */
+};
+
+/* Switch configuration. */
+message ofp_switch_config {
+    //ofp_header header;
+    uint32 flags = 1;             /* Bitmap of OFPC_* flags. */
+    uint32 miss_send_len = 2;     /* Max bytes of packet that datapath
+                                     should send to the controller. See
+                                     ofp_controller_max_len for valid values.
+                                   */
+};
+
+/* Flags to configure the table. Reserved for future use. */
+enum ofp_table_config {
+    OFPTC_INVALID = 0;
+    OFPTC_DEPRECATED_MASK = 3;     /* Deprecated bits */
+};
+
+/* Table numbering. Tables can use any number up to OFPT_MAX. */
+enum ofp_table {
+
+    OFPTT_INVALID = 0;
+
+    /* Last usable table number. */
+    OFPTT_MAX        = 0xfe;
+
+    /* Fake tables. */
+    OFPTT_ALL        = 0xff;   /* Wildcard table used for table config,
+                                  flow stats and flow deletes. */
+};
+
+
+/* Configure/Modify behavior of a flow table */
+message ofp_table_mod {
+    //ofp_header header;
+    uint32 table_id = 1;  /* ID of the table, OFPTT_ALL indicates all tables */
+    uint32 config = 2;    /* Bitmap of OFPTC_* flags */
+};
+
+/* Capabilities supported by the datapath. */
+enum ofp_capabilities {
+    OFPC_INVALID        = 0;
+    OFPC_FLOW_STATS     = 1;    /* Flow statistics. */
+    OFPC_TABLE_STATS    = 2;    /* Table statistics. */
+    OFPC_PORT_STATS     = 4;    /* Port statistics. */
+    OFPC_GROUP_STATS    = 8;    /* Group statistics. */
+    OFPC_IP_REASM       = 32;   /* Can reassemble IP fragments. */
+    OFPC_QUEUE_STATS    = 64;   /* Queue statistics. */
+    OFPC_PORT_BLOCKED   = 256;  /* Switch will block looping ports. */
+};
+
+/* Flags to indicate behavior of the physical port.  These flags are
+ * used in ofp_port to describe the current configuration.  They are
+ * used in the ofp_port_mod message to configure the port's behavior.
+ */
+enum ofp_port_config {
+    OFPPC_INVALID      = 0;
+    OFPPC_PORT_DOWN    = 1;   /* Port is administratively down. */
+
+    OFPPC_NO_RECV      = 4;   /* Drop all packets received by port. */
+    OFPPC_NO_FWD       = 32;  /* Drop packets forwarded to port. */
+    OFPPC_NO_PACKET_IN = 64;  /* Do not send packet-in msgs for port. */
+};
+
+/* Current state of the physical port.  These are not configurable from
+ * the controller.
+ */
+enum ofp_port_state {
+    OFPPS_INVALID      = 0;
+    OFPPS_LINK_DOWN    = 1;  /* No physical link present. */
+    OFPPS_BLOCKED      = 2;  /* Port is blocked */
+    OFPPS_LIVE         = 4;  /* Live for Fast Failover Group. */
+};
+
+/* Features of ports available in a datapath. */
+enum ofp_port_features {
+    OFPPF_INVALID    = 0;
+    OFPPF_10MB_HD    = 1;      /* 10 Mb half-duplex rate support. */
+    OFPPF_10MB_FD    = 2;      /* 10 Mb full-duplex rate support. */
+    OFPPF_100MB_HD   = 4;      /* 100 Mb half-duplex rate support. */
+    OFPPF_100MB_FD   = 8;      /* 100 Mb full-duplex rate support. */
+    OFPPF_1GB_HD     = 16;     /* 1 Gb half-duplex rate support. */
+    OFPPF_1GB_FD     = 32;     /* 1 Gb full-duplex rate support. */
+    OFPPF_10GB_FD    = 64;     /* 10 Gb full-duplex rate support. */
+    OFPPF_40GB_FD    = 128;    /* 40 Gb full-duplex rate support. */
+    OFPPF_100GB_FD   = 256;    /* 100 Gb full-duplex rate support. */
+    OFPPF_1TB_FD     = 512;    /* 1 Tb full-duplex rate support. */
+    OFPPF_OTHER      = 1024;   /* Other rate, not in the list. */
+    OFPPF_COPPER     = 2048;   /* Copper medium. */
+    OFPPF_FIBER      = 4096;   /* Fiber medium. */
+    OFPPF_AUTONEG    = 8192;   /* Auto-negotiation. */
+    OFPPF_PAUSE      = 16384;  /* Pause. */
+    OFPPF_PAUSE_ASYM = 32768;  /* Asymmetric pause. */
+};
+
+/* Description of a port */
+message ofp_port {
+    uint32 port_no = 1;
+    repeated uint32 hw_addr = 2; // [OFP_ETH_ALEN];
+    string name = 3;             /* Null-terminated */
+
+    uint32 config = 4;           /* Bitmap of OFPPC_* flags. */
+    uint32 state = 5;            /* Bitmap of OFPPS_* flags. */
+
+    /* Bitmaps of OFPPF_* that describe features.  All bits zeroed if
+     * unsupported or unavailable. */
+    uint32 curr = 6;           /* Current features. */
+    uint32 advertised = 7;     /* Features being advertised by the port. */
+    uint32 supported = 8;      /* Features supported by the port. */
+    uint32 peer = 9;           /* Features advertised by peer. */
+    uint32 curr_speed = 10;    /* Current port bitrate in kbps. */
+    uint32 max_speed = 11;     /* Max port bitrate in kbps */
+};
+
+/* Switch features. */
+message ofp_switch_features {
+    //ofp_header header;
+    uint64 datapath_id = 1;   /* Datapath unique ID.  The lower 48-bits are for
+                                 a MAC address, while the upper 16-bits are
+                                 implementer-defined. */
+
+    uint32 n_buffers = 2;     /* Max packets buffered at once. */
+
+    uint32 n_tables = 3;      /* Number of tables supported by datapath. */
+    uint32 auxiliary_id = 4;  /* Identify auxiliary connections */
+
+    /* Features. */
+    uint32 capabilities = 5;  /* Bitmap of support "ofp_capabilities". */
+};
+
+/* What changed about the physical port */
+enum ofp_port_reason {
+    OFPPR_ADD     = 0;         /* The port was added. */
+    OFPPR_DELETE  = 1;         /* The port was removed. */
+    OFPPR_MODIFY  = 2;         /* Some attribute of the port has changed. */
+};
+
+/* A physical port has changed in the datapath */
+message ofp_port_status {
+    //ofp_header header;
+    ofp_port_reason reason = 1; /* One of OFPPR_*. */
+    ofp_port desc = 2;
+};
+
+/* Modify behavior of the physical port */
+message ofp_port_mod {
+    //ofp_header header;
+    uint32 port_no = 1;
+    repeated uint32 hw_addr = 2; //[OFP_ETH_ALEN];
+                                      /* The hardware address is not
+                                         configurable.  This is used to
+                                         sanity-check the request, so it must
+                                         be the same as returned in an
+                                         ofp_port struct. */
+    uint32 config = 3;        /* Bitmap of OFPPC_* flags. */
+    uint32 mask = 4;          /* Bitmap of OFPPC_* flags to be changed. */
+
+    uint32 advertise = 5;     /* Bitmap of OFPPF_*.  Zero all bits to prevent
+                                 any action taking place. */
+};
+
+/* ## -------------------------- ## */
+/* ## OpenFlow Extensible Match. ## */
+/* ## -------------------------- ## */
+
+/* The match type indicates the match structure (set of fields that compose the
+ * match) in use. The match type is placed in the type field at the beginning
+ * of all match structures. The "OpenFlow Extensible Match" type corresponds
+ * to OXM TLV format described below and must be supported by all OpenFlow
+ * switches. Extensions that define other match types may be published on the
+ * ONF wiki. Support for extensions is optional.
+ */
+enum ofp_match_type {
+    OFPMT_STANDARD = 0;       /* Deprecated. */
+    OFPMT_OXM      = 1;       /* OpenFlow Extensible Match */
+};
+
+/* Fields to match against flows */
+message ofp_match {
+    ofp_match_type type = 1;         /* One of OFPMT_* */
+    repeated ofp_oxm_field oxm_fields = 2;  /* 0 or more */
+};
+
+/* Components of a OXM TLV header.
+ * Those macros are not valid for the experimenter class, macros for the
+ * experimenter class will depend on the experimenter header used. */
+//#define OXM_HEADER__(CLASS, FIELD, HASMASK, LENGTH) \
+//    (((CLASS) << 16) | ((FIELD) << 9) | ((HASMASK) << 8) | (LENGTH))
+//#define OXM_HEADER(CLASS, FIELD, LENGTH) \
+//    OXM_HEADER__(CLASS, FIELD, 0, LENGTH)
+//#define OXM_HEADER_W(CLASS, FIELD, LENGTH) \
+//    OXM_HEADER__(CLASS, FIELD, 1, (LENGTH) * 2)
+//#define OXM_CLASS(HEADER) ((HEADER) >> 16)
+//#define OXM_FIELD(HEADER) (((HEADER) >> 9) & 0x7f)
+//#define OXM_TYPE(HEADER) (((HEADER) >> 9) & 0x7fffff)
+//#define OXM_HASMASK(HEADER) (((HEADER) >> 8) & 1)
+//#define OXM_LENGTH(HEADER) ((HEADER) & 0xff)
+//
+//#define OXM_MAKE_WILD_HEADER(HEADER) \
+//    OXM_HEADER_W(OXM_CLASS(HEADER), OXM_FIELD(HEADER), OXM_LENGTH(HEADER))
+
+/* OXM Class IDs.
+ * The high order bit differentiate reserved classes from member classes.
+ * Classes 0x0000 to 0x7FFF are member classes, allocated by ONF.
+ * Classes 0x8000 to 0xFFFE are reserved classes, reserved for standardisation.
+ */
+enum ofp_oxm_class {
+    OFPXMC_NXM_0          = 0x0000;    /* Backward compatibility with NXM */
+    OFPXMC_NXM_1          = 0x0001;    /* Backward compatibility with NXM */
+    OFPXMC_OPENFLOW_BASIC = 0x8000;    /* Basic class for OpenFlow */
+    OFPXMC_EXPERIMENTER   = 0xFFFF;    /* Experimenter class */
+};
+
+/* OXM Flow field types for OpenFlow basic class. */
+enum oxm_ofb_field_types {
+    OFPXMT_OFB_IN_PORT        = 0;  /* Switch input port. */
+    OFPXMT_OFB_IN_PHY_PORT    = 1;  /* Switch physical input port. */
+    OFPXMT_OFB_METADATA       = 2;  /* Metadata passed between tables. */
+    OFPXMT_OFB_ETH_DST        = 3;  /* Ethernet destination address. */
+    OFPXMT_OFB_ETH_SRC        = 4;  /* Ethernet source address. */
+    OFPXMT_OFB_ETH_TYPE       = 5;  /* Ethernet frame type. */
+    OFPXMT_OFB_VLAN_VID       = 6;  /* VLAN id. */
+    OFPXMT_OFB_VLAN_PCP       = 7;  /* VLAN priority. */
+    OFPXMT_OFB_IP_DSCP        = 8;  /* IP DSCP (6 bits in ToS field). */
+    OFPXMT_OFB_IP_ECN         = 9;  /* IP ECN (2 bits in ToS field). */
+    OFPXMT_OFB_IP_PROTO       = 10; /* IP protocol. */
+    OFPXMT_OFB_IPV4_SRC       = 11; /* IPv4 source address. */
+    OFPXMT_OFB_IPV4_DST       = 12; /* IPv4 destination address. */
+    OFPXMT_OFB_TCP_SRC        = 13; /* TCP source port. */
+    OFPXMT_OFB_TCP_DST        = 14; /* TCP destination port. */
+    OFPXMT_OFB_UDP_SRC        = 15; /* UDP source port. */
+    OFPXMT_OFB_UDP_DST        = 16; /* UDP destination port. */
+    OFPXMT_OFB_SCTP_SRC       = 17; /* SCTP source port. */
+    OFPXMT_OFB_SCTP_DST       = 18; /* SCTP destination port. */
+    OFPXMT_OFB_ICMPV4_TYPE    = 19; /* ICMP type. */
+    OFPXMT_OFB_ICMPV4_CODE    = 20; /* ICMP code. */
+    OFPXMT_OFB_ARP_OP         = 21; /* ARP opcode. */
+    OFPXMT_OFB_ARP_SPA        = 22; /* ARP source IPv4 address. */
+    OFPXMT_OFB_ARP_TPA        = 23; /* ARP target IPv4 address. */
+    OFPXMT_OFB_ARP_SHA        = 24; /* ARP source hardware address. */
+    OFPXMT_OFB_ARP_THA        = 25; /* ARP target hardware address. */
+    OFPXMT_OFB_IPV6_SRC       = 26; /* IPv6 source address. */
+    OFPXMT_OFB_IPV6_DST       = 27; /* IPv6 destination address. */
+    OFPXMT_OFB_IPV6_FLABEL    = 28; /* IPv6 Flow Label */
+    OFPXMT_OFB_ICMPV6_TYPE    = 29; /* ICMPv6 type. */
+    OFPXMT_OFB_ICMPV6_CODE    = 30; /* ICMPv6 code. */
+    OFPXMT_OFB_IPV6_ND_TARGET = 31; /* Target address for ND. */
+    OFPXMT_OFB_IPV6_ND_SLL    = 32; /* Source link-layer for ND. */
+    OFPXMT_OFB_IPV6_ND_TLL    = 33; /* Target link-layer for ND. */
+    OFPXMT_OFB_MPLS_LABEL     = 34; /* MPLS label. */
+    OFPXMT_OFB_MPLS_TC        = 35; /* MPLS TC. */
+    OFPXMT_OFB_MPLS_BOS       = 36; /* MPLS BoS bit. */
+    OFPXMT_OFB_PBB_ISID       = 37; /* PBB I-SID. */
+    OFPXMT_OFB_TUNNEL_ID      = 38; /* Logical Port Metadata. */
+    OFPXMT_OFB_IPV6_EXTHDR    = 39; /* IPv6 Extension Header pseudo-field */
+};
+
+/* OXM Flow match fields */
+message ofp_oxm_field {
+    ofp_oxm_class oxm_class = 1;
+    oneof field {
+        /* 2 and 3 reserved for NXM_0 and NXM-1 OXM classes */
+        ofp_oxm_ofb_field ofb_field = 4;
+        ofp_oxm_experimenter_field experimenter_field = 5;
+    }
+}
+
+/* OXM OpenFlow Basic Match Field */
+message ofp_oxm_ofb_field {
+    oxm_ofb_field_types type = 1;
+    bool has_mask = 2;
+    oneof value {
+
+        /* OpenFlow port on which the packet was received.
+         * May be a physical port, a logical port, or the reserved port OFPP_LOCAL
+         *
+         * Prereqs: None.
+         *
+         * Format: 32-bit integer in network byte order.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_IN_PORT    OXM_HEADER  (0x8000, OFPXMT_OFB_IN_PORT, 4)
+        uint32 port = 3; /* Used for OFPXMT_OFB_IN_PORT */
+
+        /* Physical port on which the packet was received.
+         *
+         * Consider a packet received on a tunnel interface defined over a link
+         * aggregation group (LAG) with two physical port members.  If the tunnel
+         * interface is the logical port bound to OpenFlow.  In this case,
+         * OFPXMT_OF_IN_PORT is the tunnel's port number and OFPXMT_OF_IN_PHY_PORT is
+         * the physical port number of the LAG on which the tunnel is configured.
+         *
+         * When a packet is received directly on a physical port and not processed by a
+         * logical port, OFPXMT_OF_IN_PORT and OFPXMT_OF_IN_PHY_PORT have the same
+         * value.
+         *
+         * This field is usually not available in a regular match and only available
+         * in ofp_packet_in messages when it's different from OXM_OF_IN_PORT.
+         *
+         * Prereqs: OXM_OF_IN_PORT must be present.
+         *
+         * Format: 32-bit integer in network byte order.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_IN_PHY_PORT OXM_HEADER  (0x8000, OFPXMT_OFB_IN_PHY_PORT, 4)
+        uint32 physical_port = 4; /* Used for OFPXMT_OF_IN_PHY_PORT */
+
+        /* Table metadata.
+         *
+         * Prereqs: None.
+         *
+         * Format: 64-bit integer in network byte order.
+         *
+         * Masking: Arbitrary masks.
+         */
+        //#define OXM_OF_METADATA   OXM_HEADER  (0x8000, OFPXMT_OFB_METADATA, 8)
+        //#define OXM_OF_METADATA_W OXM_HEADER_W(0x8000, OFPXMT_OFB_METADATA, 8)
+        uint64 table_metadata = 5; /* Used for OFPXMT_OFB_METADATA */
+
+        /* Source or destination address in Ethernet header.
+         *
+         * Prereqs: None.
+         *
+         * Format: 48-bit Ethernet MAC address.
+         *
+         * Masking: Arbitrary masks. */
+        //#define OXM_OF_ETH_DST    OXM_HEADER  (0x8000, OFPXMT_OFB_ETH_DST, 6)
+        //#define OXM_OF_ETH_DST_W  OXM_HEADER_W(0x8000, OFPXMT_OFB_ETH_DST, 6)
+        //#define OXM_OF_ETH_SRC    OXM_HEADER  (0x8000, OFPXMT_OFB_ETH_SRC, 6)
+        //#define OXM_OF_ETH_SRC_W  OXM_HEADER_W(0x8000, OFPXMT_OFB_ETH_SRC, 6)
+        bytes eth_dst = 6; /* Used for OFPXMT_OFB_ETH_DST (exactly 6 bytes) */
+        bytes eth_src = 7; /* Used for OFPXMT_OFB_ETH_SRC (exactly 6 bytes) */
+
+        /* Packet's Ethernet type.
+         *
+         * Prereqs: None.
+         *
+         * Format: 16-bit integer in network byte order.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_ETH_TYPE   OXM_HEADER  (0x8000, OFPXMT_OFB_ETH_TYPE,2)
+        uint32 eth_type = 8; /* Used for OFPXMT_OFB_ETH_TYPE */
+
+        /* 802.1Q VID.
+         *
+         * For a packet with an 802.1Q header, this is the VLAN-ID (VID) from the
+         * outermost tag, with the CFI bit forced to 1. For a packet with no 802.1Q
+         * header, this has value OFPVID_NONE.
+         *
+         * Prereqs: None.
+         *
+         * Format: 16-bit integer in network byte order with bit 13 indicating
+         * presence of VLAN header and 3 most-significant bits forced to 0.
+         * Only the lower 13 bits have meaning.
+         *
+         * Masking: Arbitrary masks.
+         *
+         * This field can be used in various ways:
+         *
+         *   - If it is not constrained at all, the nx_match matches packets without
+         *     an 802.1Q header or with an 802.1Q header that has any VID value.
+         *
+         *   - Testing for an exact match with 0x0 matches only packets without
+         *     an 802.1Q header.
+         *
+         *   - Testing for an exact match with a VID value with CFI=1 matches packets
+         *     that have an 802.1Q header with a specified VID.
+         *
+         *   - Testing for an exact match with a nonzero VID value with CFI=0 does
+         *     not make sense.  The switch may reject this combination.
+         *
+         *   - Testing with nxm_value=0, nxm_mask=0x0fff matches packets with no 802.1Q
+         *     header or with an 802.1Q header with a VID of 0.
+         *
+         *   - Testing with nxm_value=0x1000, nxm_mask=0x1000 matches packets with
+         *     an 802.1Q header that has any VID value.
+         */
+        //#define OXM_OF_VLAN_VID   OXM_HEADER  (0x8000, OFPXMT_OFB_VLAN_VID, 2)
+        //#define OXM_OF_VLAN_VID_W OXM_HEADER_W(0x8000, OFPXMT_OFB_VLAN_VID, 2)
+        uint32 vlan_vid = 9; /* Used for OFPXMT_OFB_VLAN_VID */
+
+        /* 802.1Q PCP.
+         *
+         * For a packet with an 802.1Q header, this is the VLAN-PCP from the
+         * outermost tag.  For a packet with no 802.1Q header, this has value
+         * 0.
+         *
+         * Prereqs: OXM_OF_VLAN_VID must be different from OFPVID_NONE.
+         *
+         * Format: 8-bit integer with 5 most-significant bits forced to 0.
+         * Only the lower 3 bits have meaning.
+         *
+         * Masking: Not maskable.
+         */
+        //#define OXM_OF_VLAN_PCP   OXM_HEADER  (0x8000, OFPXMT_OFB_VLAN_PCP, 1)
+        uint32 vlan_pcp = 10; /* Used for OFPXMT_OFB_VLAN_PCP */
+
+        /* The Diff Serv Code Point (DSCP) bits of the IP header.
+         * Part of the IPv4 ToS field or the IPv6 Traffic Class field.
+         *
+         * Prereqs: OXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd.
+         *
+         * Format: 8-bit integer with 2 most-significant bits forced to 0.
+         * Only the lower 6 bits have meaning.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_IP_DSCP     OXM_HEADER  (0x8000, OFPXMT_OFB_IP_DSCP, 1)
+        uint32 ip_dscp = 11; /* Used for OFPXMT_OFB_IP_DSCP */
+
+        /* The ECN bits of the IP header.
+         * Part of the IPv4 ToS field or the IPv6 Traffic Class field.
+         *
+         * Prereqs: OXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd.
+         *
+         * Format: 8-bit integer with 6 most-significant bits forced to 0.
+         * Only the lower 2 bits have meaning.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_IP_ECN     OXM_HEADER  (0x8000, OFPXMT_OFB_IP_ECN, 1)
+        uint32 ip_ecn = 12; /* Used for OFPXMT_OFB_IP_ECN */
+
+        /* The "protocol" byte in the IP header.
+         *
+         * Prereqs: OXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd.
+         *
+         * Format: 8-bit integer.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_IP_PROTO   OXM_HEADER  (0x8000, OFPXMT_OFB_IP_PROTO, 1)
+        uint32 ip_proto = 13; /* Used for OFPXMT_OFB_IP_PROTO */
+
+        /* The source or destination address in the IP header.
+         *
+         * Prereqs: OXM_OF_ETH_TYPE must match 0x0800 exactly.
+         *
+         * Format: 32-bit integer in network byte order.
+         *
+         * Masking: Arbitrary masks.
+         */
+        //#define OXM_OF_IPV4_SRC     OXM_HEADER  (0x8000, OFPXMT_OFB_IPV4_SRC, 4)
+        //#define OXM_OF_IPV4_SRC_W   OXM_HEADER_W(0x8000, OFPXMT_OFB_IPV4_SRC, 4)
+        //#define OXM_OF_IPV4_DST     OXM_HEADER  (0x8000, OFPXMT_OFB_IPV4_DST, 4)
+        //#define OXM_OF_IPV4_DST_W   OXM_HEADER_W(0x8000, OFPXMT_OFB_IPV4_DST, 4)
+        uint32 ipv4_src = 14; /* Used for OFPXMT_OFB_IPV4_SRC */
+        uint32 ipv4_dst = 15; /* Used for OFPXMT_OFB_IPV4_DST */
+
+        /* The source or destination port in the TCP header.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must be either 0x0800 or 0x86dd.
+         *   OXM_OF_IP_PROTO must match 6 exactly.
+         *
+         * Format: 16-bit integer in network byte order.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_TCP_SRC    OXM_HEADER  (0x8000, OFPXMT_OFB_TCP_SRC, 2)
+        //#define OXM_OF_TCP_DST    OXM_HEADER  (0x8000, OFPXMT_OFB_TCP_DST, 2)
+        uint32 tcp_src = 16; /* Used for OFPXMT_OFB_TCP_SRC */
+        uint32 tcp_dst = 17; /* Used for OFPXMT_OFB_TCP_DST */
+
+        /* The source or destination port in the UDP header.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match either 0x0800 or 0x86dd.
+         *   OXM_OF_IP_PROTO must match 17 exactly.
+         *
+         * Format: 16-bit integer in network byte order.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_UDP_SRC    OXM_HEADER  (0x8000, OFPXMT_OFB_UDP_SRC, 2)
+        //#define OXM_OF_UDP_DST    OXM_HEADER  (0x8000, OFPXMT_OFB_UDP_DST, 2)
+        uint32 udp_src = 18; /* Used for OFPXMT_OFB_UDP_SRC */
+        uint32 udp_dst = 19; /* Used for OFPXMT_OFB_UDP_DST */
+
+        /* The source or destination port in the SCTP header.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match either 0x0800 or 0x86dd.
+         *   OXM_OF_IP_PROTO must match 132 exactly.
+         *
+         * Format: 16-bit integer in network byte order.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_SCTP_SRC   OXM_HEADER  (0x8000, OFPXMT_OFB_SCTP_SRC, 2)
+        //#define OXM_OF_SCTP_DST   OXM_HEADER  (0x8000, OFPXMT_OFB_SCTP_DST, 2)
+        uint32 sctp_src = 20; /* Used for OFPXMT_OFB_SCTP_SRC */
+        uint32 sctp_dst = 21; /* Used for OFPXMT_OFB_SCTP_DST */
+
+        /* The type or code in the ICMP header.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match 0x0800 exactly.
+         *   OXM_OF_IP_PROTO must match 1 exactly.
+         *
+         * Format: 8-bit integer.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_ICMPV4_TYPE  OXM_HEADER  (0x8000, OFPXMT_OFB_ICMPV4_TYPE, 1)
+        //#define OXM_OF_ICMPV4_CODE  OXM_HEADER  (0x8000, OFPXMT_OFB_ICMPV4_CODE, 1)
+        uint32 icmpv4_type = 22; /* Used for OFPXMT_OFB_ICMPV4_TYPE */
+        uint32 icmpv4_code = 23; /* Used for OFPXMT_OFB_ICMPV4_CODE */
+
+        /* ARP opcode.
+         *
+         * For an Ethernet+IP ARP packet, the opcode in the ARP header.  Always 0
+         * otherwise.
+         *
+         * Prereqs: OXM_OF_ETH_TYPE must match 0x0806 exactly.
+         *
+         * Format: 16-bit integer in network byte order.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_ARP_OP     OXM_HEADER  (0x8000, OFPXMT_OFB_ARP_OP, 2)
+        uint32 arp_op = 24; /* Used for OFPXMT_OFB_ARP_OP */
+
+        /* For an Ethernet+IP ARP packet, the source or target protocol address
+         * in the ARP header.  Always 0 otherwise.
+         *
+         * Prereqs: OXM_OF_ETH_TYPE must match 0x0806 exactly.
+         *
+         * Format: 32-bit integer in network byte order.
+         *
+         * Masking: Arbitrary masks.
+         */
+        //#define OXM_OF_ARP_SPA    OXM_HEADER  (0x8000, OFPXMT_OFB_ARP_SPA, 4)
+        //#define OXM_OF_ARP_SPA_W  OXM_HEADER_W(0x8000, OFPXMT_OFB_ARP_SPA, 4)
+        //#define OXM_OF_ARP_TPA    OXM_HEADER  (0x8000, OFPXMT_OFB_ARP_TPA, 4)
+        //#define OXM_OF_ARP_TPA_W  OXM_HEADER_W(0x8000, OFPXMT_OFB_ARP_TPA, 4)
+        uint32 arp_spa = 25; /* For OFPXMT_OFB_ARP_SPA */
+        uint32 arp_tpa = 26; /* For OFPXMT_OFB_ARP_TPA */
+
+        /* For an Ethernet+IP ARP packet, the source or target hardware address
+         * in the ARP header.  Always 0 otherwise.
+         *
+         * Prereqs: OXM_OF_ETH_TYPE must match 0x0806 exactly.
+         *
+         * Format: 48-bit Ethernet MAC address.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_ARP_SHA    OXM_HEADER   (0x8000, OFPXMT_OFB_ARP_SHA, 6)
+        //#define OXM_OF_ARP_SHA_W  OXM_HEADER_W (0x8000, OFPXMT_OFB_ARP_SHA, 6)
+        //#define OXM_OF_ARP_THA    OXM_HEADER   (0x8000, OFPXMT_OFB_ARP_THA, 6)
+        //#define OXM_OF_ARP_THA_W  OXM_HEADER_W (0x8000, OFPXMT_OFB_ARP_THA, 6)
+        bytes arp_sha = 27; /* For OFPXMT_OFB_ARP_SHA (6 bytes) */
+        bytes arp_tha = 28; /* For OFPXMT_OFB_ARP_THA (6 bytes) */
+
+        /* The source or destination address in the IPv6 header.
+         *
+         * Prereqs: OXM_OF_ETH_TYPE must match 0x86dd exactly.
+         *
+         * Format: 128-bit IPv6 address.
+         *
+         * Masking: Arbitrary masks.
+         */
+        //#define OXM_OF_IPV6_SRC    OXM_HEADER  (0x8000, OFPXMT_OFB_IPV6_SRC, 16)
+        //#define OXM_OF_IPV6_SRC_W  OXM_HEADER_W(0x8000, OFPXMT_OFB_IPV6_SRC, 16)
+        //#define OXM_OF_IPV6_DST    OXM_HEADER  (0x8000, OFPXMT_OFB_IPV6_DST, 16)
+        //#define OXM_OF_IPV6_DST_W  OXM_HEADER_W(0x8000, OFPXMT_OFB_IPV6_DST, 16)
+        bytes ipv6_src = 29; /* For OFPXMT_OFB_IPV6_SRC */
+        bytes ipv6_dst = 30; /* For OFPXMT_OFB_IPV6_DST */
+
+        /* The IPv6 Flow Label
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match 0x86dd exactly
+         *
+         * Format: 32-bit integer with 12 most-significant bits forced to 0.
+         * Only the lower 20 bits have meaning.
+         *
+         * Masking: Arbitrary masks.
+         */
+        //#define OXM_OF_IPV6_FLABEL   OXM_HEADER  (0x8000, OFPXMT_OFB_IPV6_FLABEL, 4)
+        //#define OXM_OF_IPV6_FLABEL_W OXM_HEADER_W(0x8000, OFPXMT_OFB_IPV6_FLABEL, 4)
+        uint32 ipv6_flabel = 31; /* For OFPXMT_OFB_IPV6_FLABEL */
+
+        /* The type or code in the ICMPv6 header.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match 0x86dd exactly.
+         *   OXM_OF_IP_PROTO must match 58 exactly.
+         *
+         * Format: 8-bit integer.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_ICMPV6_TYPE OXM_HEADER  (0x8000, OFPXMT_OFB_ICMPV6_TYPE, 1)
+        //#define OXM_OF_ICMPV6_CODE OXM_HEADER  (0x8000, OFPXMT_OFB_ICMPV6_CODE, 1)
+        uint32 icmpv6_type = 32; /* For OFPXMT_OFB_ICMPV6_TYPE */
+        uint32 icmpv6_code = 33; /* For OFPXMT_OFB_ICMPV6_CODE */
+
+        /* The target address in an IPv6 Neighbor Discovery message.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match 0x86dd exactly.
+         *   OXM_OF_IP_PROTO must match 58 exactly.
+         *   OXM_OF_ICMPV6_TYPE must be either 135 or 136.
+         *
+         * Format: 128-bit IPv6 address.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_IPV6_ND_TARGET OXM_HEADER \
+        //    (0x8000, OFPXMT_OFB_IPV6_ND_TARGET, 16)
+        bytes ipv6_nd_target = 34; /* For OFPXMT_OFB_IPV6_ND_TARGET */
+
+        /* The source link-layer address option in an IPv6 Neighbor Discovery
+         * message.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match 0x86dd exactly.
+         *   OXM_OF_IP_PROTO must match 58 exactly.
+         *   OXM_OF_ICMPV6_TYPE must be exactly 135.
+         *
+         * Format: 48-bit Ethernet MAC address.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_IPV6_ND_SLL  OXM_HEADER  (0x8000, OFPXMT_OFB_IPV6_ND_SLL, 6)
+        bytes ipv6_nd_ssl = 35; /* For OFPXMT_OFB_IPV6_ND_SLL */
+
+        /* The target link-layer address option in an IPv6 Neighbor Discovery
+         * message.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match 0x86dd exactly.
+         *   OXM_OF_IP_PROTO must match 58 exactly.
+         *   OXM_OF_ICMPV6_TYPE must be exactly 136.
+         *
+         * Format: 48-bit Ethernet MAC address.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_IPV6_ND_TLL  OXM_HEADER  (0x8000, OFPXMT_OFB_IPV6_ND_TLL, 6)
+        bytes ipv6_nd_tll = 36; /* For OFPXMT_OFB_IPV6_ND_TLL */
+
+        /* The LABEL in the first MPLS shim header.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match 0x8847 or 0x8848 exactly.
+         *
+         * Format: 32-bit integer in network byte order with 12 most-significant
+         * bits forced to 0. Only the lower 20 bits have meaning.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_MPLS_LABEL  OXM_HEADER  (0x8000, OFPXMT_OFB_MPLS_LABEL, 4)
+        uint32 mpls_label = 37; /* For OFPXMT_OFB_MPLS_LABEL */
+
+        /* The TC in the first MPLS shim header.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match 0x8847 or 0x8848 exactly.
+         *
+         * Format: 8-bit integer with 5 most-significant bits forced to 0.
+         * Only the lower 3 bits have meaning.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_MPLS_TC     OXM_HEADER  (0x8000, OFPXMT_OFB_MPLS_TC, 1)
+        uint32 mpls_tc = 38; /* For OFPXMT_OFB_MPLS_TC */
+
+        /* The BoS bit in the first MPLS shim header.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match 0x8847 or 0x8848 exactly.
+         *
+         * Format: 8-bit integer with 7 most-significant bits forced to 0.
+         * Only the lowest bit have a meaning.
+         *
+         * Masking: Not maskable. */
+        //#define OXM_OF_MPLS_BOS     OXM_HEADER  (0x8000, OFPXMT_OFB_MPLS_BOS, 1)
+        uint32 mpls_bos = 39; /* For OFPXMT_OFB_MPLS_BOS */
+
+        /* IEEE 802.1ah I-SID.
+         *
+         * For a packet with a PBB header, this is the I-SID from the
+         * outermost service tag.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match 0x88E7 exactly.
+         *
+         * Format: 24-bit integer in network byte order.
+         *
+         * Masking: Arbitrary masks. */
+        //#define OXM_OF_PBB_ISID   OXM_HEADER  (0x8000, OFPXMT_OFB_PBB_ISID, 3)
+        //#define OXM_OF_PBB_ISID_W OXM_HEADER_W(0x8000, OFPXMT_OFB_PBB_ISID, 3)
+        uint32 pbb_isid = 40; /* For OFPXMT_OFB_PBB_ISID */
+
+        /* Logical Port Metadata.
+         *
+         * Metadata associated with a logical port.
+         * If the logical port performs encapsulation and decapsulation, this
+         * is the demultiplexing field from the encapsulation header.
+         * For example, for a packet received via GRE tunnel including a (32-bit) key,
+         * the key is stored in the low 32-bits and the high bits are zeroed.
+         * For a MPLS logical port, the low 20 bits represent the MPLS Label.
+         * For a VxLAN logical port, the low 24 bits represent the VNI.
+         * If the packet is not received through a logical port, the value is 0.
+         *
+         * Prereqs: None.
+         *
+         * Format: 64-bit integer in network byte order.
+         *
+         * Masking: Arbitrary masks. */
+        //#define OXM_OF_TUNNEL_ID    OXM_HEADER  (0x8000, OFPXMT_OFB_TUNNEL_ID, 8)
+        //#define OXM_OF_TUNNEL_ID_W  OXM_HEADER_W(0x8000, OFPXMT_OFB_TUNNEL_ID, 8)
+        uint64 tunnel_id = 41; /* For OFPXMT_OFB_TUNNEL_ID */
+
+        /* The IPv6 Extension Header pseudo-field.
+         *
+         * Prereqs:
+         *   OXM_OF_ETH_TYPE must match 0x86dd exactly
+         *
+         * Format: 16-bit integer with 7 most-significant bits forced to 0.
+         * Only the lower 9 bits have meaning.
+         *
+         * Masking: Maskable. */
+        //#define OXM_OF_IPV6_EXTHDR   OXM_HEADER  (0x8000, OFPXMT_OFB_IPV6_EXTHDR, 2)
+        //#define OXM_OF_IPV6_EXTHDR_W OXM_HEADER_W(0x8000, OFPXMT_OFB_IPV6_EXTHDR, 2)
+        uint32 ipv6_exthdr = 42; /* For OFPXMT_OFB_IPV6_EXTHDR */
+
+    }
+
+    /* Optional mask values (must be present when has_mask is true */
+    oneof mask {
+        uint64 table_metadata_mask = 105; /* For OFPXMT_OFB_METADATA */
+
+        bytes eth_dst_mask = 106; /* For OFPXMT_OFB_ETH_DST (exactly 6 bytes)*/
+        bytes eth_src_mask = 107; /* For OFPXMT_OFB_ETH_SRC (exactly 6 bytes)*/
+
+        uint32 vlan_vid_mask = 109; /* For OFPXMT_OFB_VLAN_VID */
+
+        uint32 ipv4_src_mask = 114; /* For OFPXMT_OFB_IPV4_SRC */
+        uint32 ipv4_dst_mask = 115; /* For OFPXMT_OFB_IPV4_DST */
+
+        uint32 arp_spa_mask = 125; /* For OFPXMT_OFB_ARP_SPA */
+        uint32 arp_tpa_mask = 126; /* For OFPXMT_OFB_ARP_TPA */
+
+        bytes ipv6_src_mask = 129; /* For OFPXMT_OFB_IPV6_SRC */
+        bytes ipv6_dst_mask = 130; /* For OFPXMT_OFB_IPV6_DST */
+
+        uint32 ipv6_flabel_mask = 131; /* For OFPXMT_OFB_IPV6_FLABEL */
+
+        uint32 pbb_isid_mask = 140; /* For OFPXMT_OFB_PBB_ISID */
+
+        uint64 tunnel_id_mask = 141; /* For OFPXMT_OFB_TUNNEL_ID */
+
+        uint32 ipv6_exthdr_mask = 142; /* For OFPXMT_OFB_IPV6_EXTHDR */
+    }
+
+}
+//#define OFPXMT_OFB_ALL    ((UINT64_C(1) << 40) - 1)
+
+
+/* The VLAN id is 12-bits, so we can use the entire 16 bits to indicate
+ * special conditions.
+ */
+enum ofp_vlan_id {
+    OFPVID_NONE    = 0x0000; /* No VLAN id was set. */
+    OFPVID_PRESENT = 0x1000; /* Bit that indicate that a VLAN id is set */
+};
+/* Define for compatibility */
+//#define OFP_VLAN_NONE      OFPVID_NONE
+
+/* Bit definitions for IPv6 Extension Header pseudo-field. */
+enum ofp_ipv6exthdr_flags {
+    OFPIEH_INVALID = 0;
+    OFPIEH_NONEXT  = 1;     /* "No next header" encountered. */
+    OFPIEH_ESP     = 2;     /* Encrypted Sec Payload header present. */
+    OFPIEH_AUTH    = 4;     /* Authentication header present. */
+    OFPIEH_DEST    = 8;     /* 1 or 2 dest headers present. */
+    OFPIEH_FRAG    = 16;    /* Fragment header present. */
+    OFPIEH_ROUTER  = 32;    /* Router header present. */
+    OFPIEH_HOP     = 64;    /* Hop-by-hop header present. */
+    OFPIEH_UNREP   = 128;   /* Unexpected repeats encountered. */
+    OFPIEH_UNSEQ   = 256;   /* Unexpected sequencing encountered. */
+};
+
+/* Header for OXM experimenter match fields.
+ * The experimenter class should not use OXM_HEADER() macros for defining
+ * fields due to this extra header. */
+message ofp_oxm_experimenter_field {
+    uint32 oxm_header = 1;    /* oxm_class = OFPXMC_EXPERIMENTER */
+    uint32 experimenter = 2;  /* Experimenter ID which takes the same
+                                 form as in struct ofp_experimenter_header. */
+};
+
+/* ## ----------------- ## */
+/* ## OpenFlow Actions. ## */
+/* ## ----------------- ## */
+
+enum ofp_action_type {
+    OFPAT_OUTPUT       = 0;  /* Output to switch port. */
+    OFPAT_COPY_TTL_OUT = 11; /* Copy TTL "outwards" -- from next-to-outermost
+                                to outermost */
+    OFPAT_COPY_TTL_IN  = 12; /* Copy TTL "inwards" -- from outermost to
+                               next-to-outermost */
+    OFPAT_SET_MPLS_TTL = 15; /* MPLS TTL */
+    OFPAT_DEC_MPLS_TTL = 16; /* Decrement MPLS TTL */
+
+    OFPAT_PUSH_VLAN    = 17; /* Push a new VLAN tag */
+    OFPAT_POP_VLAN     = 18; /* Pop the outer VLAN tag */
+    OFPAT_PUSH_MPLS    = 19; /* Push a new MPLS tag */
+    OFPAT_POP_MPLS     = 20; /* Pop the outer MPLS tag */
+    OFPAT_SET_QUEUE    = 21; /* Set queue id when outputting to a port */
+    OFPAT_GROUP        = 22; /* Apply group. */
+    OFPAT_SET_NW_TTL   = 23; /* IP TTL. */
+    OFPAT_DEC_NW_TTL   = 24; /* Decrement IP TTL. */
+    OFPAT_SET_FIELD    = 25; /* Set a header field using OXM TLV format. */
+    OFPAT_PUSH_PBB     = 26; /* Push a new PBB service tag (I-TAG) */
+    OFPAT_POP_PBB      = 27; /* Pop the outer PBB service tag (I-TAG) */
+    OFPAT_EXPERIMENTER = 0xffff;
+};
+
+/* Action header that is common to all actions.  The length includes the
+ * header and any padding used to make the action 64-bit aligned.
+ * NB: The length of an action *must* always be a multiple of eight. */
+message ofp_action {
+    ofp_action_type type = 1;       /* One of OFPAT_*. */
+    oneof action {
+        ofp_action_output output = 2;
+        ofp_action_mpls_ttl mpls_ttl = 3;
+        ofp_action_push push = 4;
+        ofp_action_pop_mpls pop_mpls = 5;
+        ofp_action_group group = 6;
+        ofp_action_nw_ttl nw_ttl = 7;
+        ofp_action_set_field set_field = 8;
+        ofp_action_experimenter experimenter = 9;
+    }
+};
+
+enum ofp_controller_max_len {
+    OFPCML_INVALID   = 0;
+    OFPCML_MAX       = 0xffe5; /* maximum max_len value which can be used
+                                  to request a specific byte length. */
+    OFPCML_NO_BUFFER = 0xffff; /* indicates that no buffering should be
+                                  applied and the whole packet is to be
+                                  sent to the controller. */
+};
+
+/* Action structure for OFPAT_OUTPUT, which sends packets out 'port'.
+ * When the 'port' is the OFPP_CONTROLLER, 'max_len' indicates the max
+ * number of bytes to send.  A 'max_len' of zero means no bytes of the
+ * packet should be sent. A 'max_len' of OFPCML_NO_BUFFER means that
+ * the packet is not buffered and the complete packet is to be sent to
+ * the controller. */
+message ofp_action_output {
+    uint32 port = 1;                 /* Output port. */
+    uint32 max_len = 2;              /* Max length to send to controller. */
+};
+
+/* Action structure for OFPAT_SET_MPLS_TTL. */
+message ofp_action_mpls_ttl {
+    uint32 mpls_ttl = 1;             /* MPLS TTL */
+};
+
+/* Action structure for OFPAT_PUSH_VLAN/MPLS/PBB. */
+message ofp_action_push {
+    uint32 ethertype = 1;            /* Ethertype */
+};
+
+/* Action structure for OFPAT_POP_MPLS. */
+message ofp_action_pop_mpls {
+    uint32 ethertype = 1;            /* Ethertype */
+};
+
+/* Action structure for OFPAT_GROUP. */
+message ofp_action_group {
+    uint32 group_id = 1;             /* Group identifier. */
+};
+
+/* Action structure for OFPAT_SET_NW_TTL. */
+message ofp_action_nw_ttl {
+    uint32 nw_ttl = 1;               /* IP TTL */
+};
+
+/* Action structure for OFPAT_SET_FIELD. */
+message ofp_action_set_field {
+    ofp_oxm_field field = 1;
+};
+
+/* Action header for OFPAT_EXPERIMENTER.
+ * The rest of the body is experimenter-defined. */
+message ofp_action_experimenter {
+    uint32 experimenter = 1;         /* Experimenter ID which takes the same
+                                        form as in struct
+                                        ofp_experimenter_header. */
+    bytes data = 2;
+};
+
+/* ## ---------------------- ## */
+/* ## OpenFlow Instructions. ## */
+/* ## ---------------------- ## */
+
+enum ofp_instruction_type {
+    OFPIT_INVALID    = 0;
+    OFPIT_GOTO_TABLE = 1;       /* Setup the next table in the lookup
+                                   pipeline */
+    OFPIT_WRITE_METADATA = 2;   /* Setup the metadata field for use later in
+                                   pipeline */
+    OFPIT_WRITE_ACTIONS = 3;    /* Write the action(s) onto the datapath action
+                                   set */
+    OFPIT_APPLY_ACTIONS = 4;    /* Applies the action(s) immediately */
+    OFPIT_CLEAR_ACTIONS = 5;    /* Clears all actions from the datapath
+                                   action set */
+    OFPIT_METER = 6;            /* Apply meter (rate limiter) */
+
+    OFPIT_EXPERIMENTER = 0xFFFF; /* Experimenter instruction */
+};
+
+/* Instruction header that is common to all instructions.  The length includes
+ * the header and any padding used to make the instruction 64-bit aligned.
+ * NB: The length of an instruction *must* always be a multiple of eight. */
+message ofp_instruction {
+    uint32 type = 1;               /* Instruction type */
+    oneof data {
+        ofp_instruction_goto_table goto_table = 2;
+        ofp_instruction_write_metadata write_metadata = 3;
+        ofp_instruction_actions actions = 4;
+        ofp_instruction_meter meter = 5;
+        ofp_instruction_experimenter experimenter = 6;
+    }
+};
+
+/* Instruction structure for OFPIT_GOTO_TABLE */
+message ofp_instruction_goto_table {
+    uint32 table_id = 1;           /* Set next table in the lookup pipeline */
+};
+
+/* Instruction structure for OFPIT_WRITE_METADATA */
+message ofp_instruction_write_metadata {
+    uint64 metadata = 1;           /* Metadata value to write */
+    uint64 metadata_mask = 2;      /* Metadata write bitmask */
+};
+
+/* Instruction structure for OFPIT_WRITE/APPLY/CLEAR_ACTIONS */
+message ofp_instruction_actions {
+    repeated ofp_action actions = 1; /* 0 or more actions associated
+                                        with OFPIT_WRITE_ACTIONS and
+                                        OFPIT_APPLY_ACTIONS */
+};
+
+/* Instruction structure for OFPIT_METER */
+message ofp_instruction_meter {
+    uint32 meter_id = 1;           /* Meter instance. */
+};
+
+/* Instruction structure for experimental instructions */
+message ofp_instruction_experimenter {
+    uint32 experimenter = 1;     /* Experimenter ID which takes the same form
+                                   as in struct ofp_experimenter_header. */
+    /* Experimenter-defined arbitrary additional data. */
+    bytes data = 2;
+};
+
+/* ## --------------------------- ## */
+/* ## OpenFlow Flow Modification. ## */
+/* ## --------------------------- ## */
+
+enum ofp_flow_mod_command {
+    OFPFC_ADD           = 0; /* New flow. */
+    OFPFC_MODIFY        = 1; /* Modify all matching flows. */
+    OFPFC_MODIFY_STRICT = 2; /* Modify entry strictly matching wildcards and
+                                priority. */
+    OFPFC_DELETE        = 3; /* Delete all matching flows. */
+    OFPFC_DELETE_STRICT = 4; /* Delete entry strictly matching wildcards and
+                                priority. */
+};
+
+/* Value used in "idle_timeout" and "hard_timeout" to indicate that the entry
+ * is permanent. */
+//#define OFP_FLOW_PERMANENT 0
+
+/* By default, choose a priority in the middle. */
+//#define OFP_DEFAULT_PRIORITY 0x8000
+
+enum ofp_flow_mod_flags {
+    OFPFF_INVALID       = 0;
+    OFPFF_SEND_FLOW_REM = 1;  /* Send flow removed message when flow
+                               * expires or is deleted. */
+    OFPFF_CHECK_OVERLAP = 2;  /* Check for overlapping entries first. */
+    OFPFF_RESET_COUNTS  = 4;  /* Reset flow packet and byte counts. */
+    OFPFF_NO_PKT_COUNTS = 8;  /* Don't keep track of packet count. */
+    OFPFF_NO_BYT_COUNTS = 16; /* Don't keep track of byte count. */
+};
+
+/* Flow setup and teardown (controller -> datapath). */
+message ofp_flow_mod {
+    //ofp_header header;
+    uint64 cookie = 1;             /* Opaque controller-issued identifier. */
+    uint64 cookie_mask = 2;        /* Mask used to restrict the cookie bits
+                                      that must match when the command is
+                                      OFPFC_MODIFY* or OFPFC_DELETE*. A value
+                                      of 0 indicates no restriction. */
+    uint32 table_id = 3;           /* ID of the table to put the flow in.
+                                      For OFPFC_DELETE_* commands, OFPTT_ALL
+                                      can also be used to delete matching
+                                      flows from all tables. */
+    ofp_flow_mod_command command = 4; /* One of OFPFC_*. */
+    uint32 idle_timeout = 5;       /* Idle time before discarding (seconds). */
+    uint32 hard_timeout = 6;       /* Max time before discarding (seconds). */
+    uint32 priority = 7;           /* Priority level of flow entry. */
+    uint32 buffer_id = 8;          /* Buffered packet to apply to, or
+                                      OFP_NO_BUFFER.
+                                      Not meaningful for OFPFC_DELETE*. */
+    uint32 out_port = 9;          /* For OFPFC_DELETE* commands, require
+                                      matching entries to include this as an
+                                      output port.  A value of OFPP_ANY
+                                      indicates no restriction. */
+    uint32 out_group = 10;         /* For OFPFC_DELETE* commands, require
+                                      matching entries to include this as an
+                                      output group.  A value of OFPG_ANY
+                                      indicates no restriction. */
+    uint32 flags = 11;             /* Bitmap of OFPFF_* flags. */
+    ofp_match match = 12;          /* Fields to match. Variable size. */
+    repeated ofp_instruction instructions = 13; /* 0 or more. */
+};
+
+/* Group numbering. Groups can use any number up to OFPG_MAX. */
+enum ofp_group {
+
+    OFPG_INVALID = 0;
+
+    /* Last usable group number. */
+    OFPG_MAX        = 0x7fffff00;
+
+    /* Fake groups. */
+    OFPG_ALL        = 0x7ffffffc;  /* Represents all groups for group delete
+                                      commands. */
+    OFPG_ANY        = 0x7fffffff;  /* Special wildcard: no group specified. */
+};
+
+/* Group commands */
+enum ofp_group_mod_command {
+    OFPGC_ADD    = 0;       /* New group. */
+    OFPGC_MODIFY = 1;       /* Modify all matching groups. */
+    OFPGC_DELETE = 2;       /* Delete all matching groups. */
+};
+
+/* Bucket for use in groups. */
+message ofp_bucket {
+    uint32 weight = 1;              /* Relative weight of bucket.  Only
+                                       defined for select groups. */
+    uint32 watch_port = 2;          /* Port whose state affects whether this
+                                       bucket is live.  Only required for fast
+                                       failover groups. */
+    uint32 watch_group = 3;         /* Group whose state affects whether this
+                                       bucket is live.  Only required for fast
+                                       failover groups. */
+    repeated ofp_action actions = 4;
+};
+
+/* Group setup and teardown (controller -> datapath). */
+message ofp_group_mod {
+    //ofp_header header;
+    ofp_group_mod_command command = 1; /* One of OFPGC_*. */
+    ofp_group_type type = 2;           /* One of OFPGT_*. */
+    uint32 group_id = 3;               /* Group identifier. */
+    repeated ofp_bucket buckets = 4;
+};
+
+/* Group types.  Values in the range [128; 255] are reserved for experimental
+ * use. */
+enum ofp_group_type {
+    OFPGT_ALL      = 0; /* All (multicast/broadcast) group.  */
+    OFPGT_SELECT   = 1; /* Select group. */
+    OFPGT_INDIRECT = 2; /* Indirect group. */
+    OFPGT_FF       = 3; /* Fast failover group. */
+};
+
+/* Special buffer-id to indicate 'no buffer' */
+//#define OFP_NO_BUFFER 0xffffffff
+
+/* Send packet (controller -> datapath). */
+message ofp_packet_out {
+    //ofp_header header;
+    uint32 buffer_id = 1;          /* ID assigned by datapath (OFP_NO_BUFFER
+                                      if none). */
+    uint32 in_port = 2;            /* Packet's input port or OFPP_CONTROLLER.*/
+    repeated ofp_action actions = 3; /* Action list - 0 or more. */
+    /* The variable size action list is optionally followed by packet data.
+     * This data is only present and meaningful if buffer_id == -1. */
+    bytes data = 4;                /* Packet data. */
+};
+
+/* Why is this packet being sent to the controller? */
+enum ofp_packet_in_reason {
+    OFPR_NO_MATCH    = 0;   /* No matching flow (table-miss flow entry). */
+    OFPR_ACTION      = 1;   /* Action explicitly output to controller. */
+    OFPR_INVALID_TTL = 2;   /* Packet has invalid TTL */
+};
+
+/* Packet received on port (datapath -> controller). */
+message ofp_packet_in {
+    //ofp_header header;
+    uint32 buffer_id = 1;     /* ID assigned by datapath. */
+    ofp_packet_in_reason reason = 2; /* Reason packet is being sent */
+    uint32 table_id = 3;      /* ID of the table that was looked up */
+    uint64 cookie = 4;        /* Cookie of the flow entry that was looked up. */
+    ofp_match match = 5;      /* Packet metadata. Variable size. */
+    bytes data = 6;           /* Ethernet frame */
+};
+
+/* Why was this flow removed? */
+enum ofp_flow_removed_reason {
+    OFPRR_IDLE_TIMEOUT = 0;     /* Flow idle time exceeded idle_timeout. */
+    OFPRR_HARD_TIMEOUT = 1;     /* Time exceeded hard_timeout. */
+    OFPRR_DELETE       = 2;     /* Evicted by a DELETE flow mod. */
+    OFPRR_GROUP_DELETE = 3;     /* Group was removed. */
+    OFPRR_METER_DELETE = 4;     /* Meter was removed */
+};
+
+/* Flow removed (datapath -> controller). */
+message ofp_flow_removed {
+    //ofp_header header;
+    uint64 cookie = 1;         /* Opaque controller-issued identifier. */
+
+    uint32 priority = 2;       /* Priority level of flow entry. */
+    ofp_flow_removed_reason reason = 3; /* One of OFPRR_*. */
+    uint32 table_id = 4;        /* ID of the table */
+
+    uint32 duration_sec = 5;   /* Time flow was alive in seconds. */
+    uint32 duration_nsec = 6;  /* Time flow was alive in nanoseconds beyond
+                                 duration_sec. */
+    uint32 idle_timeout = 7;   /* Idle timeout from original flow mod. */
+    uint32 hard_timeout = 8;   /* Hard timeout from original flow mod. */
+    uint64 packet_count = 9;
+    uint64 byte_count = 10;
+    ofp_match match = 121;  /* Description of fields. Variable size. */
+};
+
+/* Meter numbering. Flow meters can use any number up to OFPM_MAX. */
+enum ofp_meter {
+    OFPM_ZERO       = 0;
+    /* Last usable meter. */
+    OFPM_MAX        = 0x7fff0000;
+
+    /* Virtual meters. */
+    OFPM_SLOWPATH   = 0x7ffffffd;  /* Meter for slow datapath. */
+    OFPM_CONTROLLER = 0x7ffffffe;  /* Meter for controller connection. */
+    OFPM_ALL        = 0x7fffffff;  /* Represents all meters for stat requests
+                                      commands. */
+};
+
+/* Meter band types */
+enum ofp_meter_band_type {
+    OFPMBT_INVALID         = 0;
+    OFPMBT_DROP            = 1;      /* Drop packet. */
+    OFPMBT_DSCP_REMARK     = 2;      /* Remark DSCP in the IP header. */
+    OFPMBT_EXPERIMENTER    = 0xFFFF; /* Experimenter meter band. */
+};
+
+/* Common header for all meter bands */
+message ofp_meter_band_header {
+    ofp_meter_band_type type = 1;   /* One of OFPMBT_*. */
+    uint32              len = 2;    /* Length in bytes of this band. */
+    uint32              rate = 3;   /* Rate for this band. */
+    uint32              burst_size = 4;/* Size of bursts. */
+};
+
+/* OFPMBT_DROP band - drop packets */
+message ofp_meter_band_drop {
+    uint32        type = 1;   /* OFPMBT_DROP. */
+    uint32        len = 2;   /* Length in bytes of this band. */
+    uint32        rate = 3;   /* Rate for dropping packets. */
+    uint32        burst_size = 4;/* Size of bursts. */
+};
+
+/* OFPMBT_DSCP_REMARK band - Remark DSCP in the IP header */
+message ofp_meter_band_dscp_remark {
+    uint32        type = 1;       /* OFPMBT_DSCP_REMARK. */
+    uint32        len = 2;        /* Length in bytes of this band. */
+    uint32        rate = 3;       /* Rate for remarking packets. */
+    uint32        burst_size = 4; /* Size of bursts. */
+    uint32        prec_level = 5; /* Number of drop precedence level to add. */
+};
+
+/* OFPMBT_EXPERIMENTER band - Experimenter type.
+ * The rest of the band is experimenter-defined. */
+message ofp_meter_band_experimenter {
+    ofp_meter_band_type type = 1;        /* One of OFPMBT_*. */
+    uint32              len = 2;         /* Length in bytes of this band. */
+    uint32              rate = 3;        /* Rate for this band. */
+    uint32              burst_size = 4;  /* Size of bursts. */
+    uint32              experimenter = 5;/* Experimenter ID which takes the
+                                            same form as in struct
+                                            ofp_experimenter_header. */
+};
+
+/* Meter commands */
+enum ofp_meter_mod_command {
+    OFPMC_ADD = 0;              /* New meter. */
+    OFPMC_MODIFY = 1;           /* Modify specified meter. */
+    OFPMC_DELETE = 2;           /* Delete specified meter. */
+};
+
+/* Meter configuration flags */
+enum ofp_meter_flags {
+    OFPMF_INVALID = 0;
+    OFPMF_KBPS    = 1;     /* Rate value in kb/s (kilo-bit per second). */
+    OFPMF_PKTPS   = 2;     /* Rate value in packet/sec. */
+    OFPMF_BURST   = 4;     /* Do burst size. */
+    OFPMF_STATS   = 8;     /* Collect statistics. */
+};
+
+/* Meter configuration. OFPT_METER_MOD. */
+message ofp_meter_mod {
+//    ofp_header   header = 1;
+    ofp_meter_mod_command command = 1;       /* One of OFPMC_*. */
+    uint32                flags = 2;         /* Bitmap of OFPMF_* flags. */
+    uint32                meter_id = 3;      /* Meter instance. */
+    repeated ofp_meter_band_header bands = 4; /* The band list length is
+                                                 inferred from the length field
+                                                 in the header. */
+};
+
+/* Values for 'type' in ofp_error_message.  These values are immutable: they
+ * will not change in future versions of the protocol (although new values may
+ * be added). */
+enum ofp_error_type {
+    OFPET_HELLO_FAILED         = 0;  /* Hello protocol failed. */
+    OFPET_BAD_REQUEST          = 1;  /* Request was not understood. */
+    OFPET_BAD_ACTION           = 2;  /* Error in action description. */
+    OFPET_BAD_INSTRUCTION      = 3;  /* Error in instruction list. */
+    OFPET_BAD_MATCH            = 4;  /* Error in match. */
+    OFPET_FLOW_MOD_FAILED      = 5;  /* Problem modifying flow entry. */
+    OFPET_GROUP_MOD_FAILED     = 6;  /* Problem modifying group entry. */
+    OFPET_PORT_MOD_FAILED      = 7;  /* Port mod request failed. */
+    OFPET_TABLE_MOD_FAILED     = 8;  /* Table mod request failed. */
+    OFPET_QUEUE_OP_FAILED      = 9;  /* Queue operation failed. */
+    OFPET_SWITCH_CONFIG_FAILED = 10; /* Switch config request failed. */
+    OFPET_ROLE_REQUEST_FAILED  = 11; /* Controller Role request failed. */
+    OFPET_METER_MOD_FAILED     = 12; /* Error in meter. */
+    OFPET_TABLE_FEATURES_FAILED = 13; /* Setting table features failed. */
+    OFPET_EXPERIMENTER = 0xffff;      /* Experimenter error messages. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_HELLO_FAILED.  'data' contains an
+ * ASCII text string that may give failure details. */
+enum ofp_hello_failed_code {
+    OFPHFC_INCOMPATIBLE = 0;    /* No compatible version. */
+    OFPHFC_EPERM        = 1;    /* Permissions error. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_BAD_REQUEST.  'data' contains at least
+ * the first 64 bytes of the failed request. */
+enum ofp_bad_request_code {
+    OFPBRC_BAD_VERSION      = 0;  /* ofp_header.version not supported. */
+    OFPBRC_BAD_TYPE         = 1;  /* ofp_header.type not supported. */
+    OFPBRC_BAD_MULTIPART    = 2;  /* ofp_multipart_request.type not supported.
+                                   */
+    OFPBRC_BAD_EXPERIMENTER = 3;  /* Experimenter id not supported
+                                   * (in ofp_experimenter_header or
+                                   * ofp_multipart_request or
+                                   * ofp_multipart_reply). */
+    OFPBRC_BAD_EXP_TYPE     = 4;  /* Experimenter type not supported. */
+    OFPBRC_EPERM            = 5;  /* Permissions error. */
+    OFPBRC_BAD_LEN          = 6;  /* Wrong request length for type. */
+    OFPBRC_BUFFER_EMPTY     = 7;  /* Specified buffer has already been used. */
+    OFPBRC_BUFFER_UNKNOWN   = 8;  /* Specified buffer does not exist. */
+    OFPBRC_BAD_TABLE_ID     = 9;  /* Specified table-id invalid or does not
+                                   * exist. */
+    OFPBRC_IS_SLAVE         = 10; /* Denied because controller is slave. */
+    OFPBRC_BAD_PORT         = 11; /* Invalid port. */
+    OFPBRC_BAD_PACKET       = 12; /* Invalid packet in packet-out. */
+    OFPBRC_MULTIPART_BUFFER_OVERFLOW    = 13; /* ofp_multipart_request
+                                     overflowed the assigned buffer. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_BAD_ACTION.  'data' contains at least
+ * the first 64 bytes of the failed request. */
+enum ofp_bad_action_code {
+    OFPBAC_BAD_TYPE           = 0;  /* Unknown or unsupported action type. */
+    OFPBAC_BAD_LEN            = 1;  /* Length problem in actions. */
+    OFPBAC_BAD_EXPERIMENTER   = 2;  /* Unknown experimenter id specified. */
+    OFPBAC_BAD_EXP_TYPE       = 3;  /* Unknown action for experimenter id. */
+    OFPBAC_BAD_OUT_PORT       = 4;  /* Problem validating output port. */
+    OFPBAC_BAD_ARGUMENT       = 5;  /* Bad action argument. */
+    OFPBAC_EPERM              = 6;  /* Permissions error. */
+    OFPBAC_TOO_MANY           = 7;  /* Can't handle this many actions. */
+    OFPBAC_BAD_QUEUE          = 8;  /* Problem validating output queue. */
+    OFPBAC_BAD_OUT_GROUP      = 9;  /* Invalid group id in forward action. */
+    OFPBAC_MATCH_INCONSISTENT = 10; /* Action can't apply for this match,
+                                       or Set-Field missing prerequisite. */
+    OFPBAC_UNSUPPORTED_ORDER  = 11; /* Action order is unsupported for the
+                                 action list in an Apply-Actions instruction */
+    OFPBAC_BAD_TAG            = 12; /* Actions uses an unsupported
+                                       tag/encap. */
+    OFPBAC_BAD_SET_TYPE       = 13; /* Unsupported type in SET_FIELD action. */
+    OFPBAC_BAD_SET_LEN        = 14; /* Length problem in SET_FIELD action. */
+    OFPBAC_BAD_SET_ARGUMENT   = 15; /* Bad argument in SET_FIELD action. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_BAD_INSTRUCTION.  'data' contains at
+ * least the first 64 bytes of the failed request. */
+enum ofp_bad_instruction_code {
+    OFPBIC_UNKNOWN_INST     = 0; /* Unknown instruction. */
+    OFPBIC_UNSUP_INST       = 1; /* Switch or table does not support the
+                                    instruction. */
+    OFPBIC_BAD_TABLE_ID     = 2; /* Invalid Table-ID specified. */
+    OFPBIC_UNSUP_METADATA   = 3; /* Metadata value unsupported by datapath. */
+    OFPBIC_UNSUP_METADATA_MASK = 4; /* Metadata mask value unsupported by
+                                       datapath. */
+    OFPBIC_BAD_EXPERIMENTER = 5; /* Unknown experimenter id specified. */
+    OFPBIC_BAD_EXP_TYPE     = 6; /* Unknown instruction for experimenter id. */
+    OFPBIC_BAD_LEN          = 7; /* Length problem in instructions. */
+    OFPBIC_EPERM            = 8; /* Permissions error. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_BAD_MATCH.  'data' contains at least
+ * the first 64 bytes of the failed request. */
+enum ofp_bad_match_code {
+    OFPBMC_BAD_TYPE         = 0;  /* Unsupported match type specified by the
+                                     match */
+    OFPBMC_BAD_LEN          = 1;  /* Length problem in match. */
+    OFPBMC_BAD_TAG          = 2;  /* Match uses an unsupported tag/encap. */
+    OFPBMC_BAD_DL_ADDR_MASK = 3;  /* Unsupported datalink addr mask - switch
+                                     does not support arbitrary datalink
+                                     address mask. */
+    OFPBMC_BAD_NW_ADDR_MASK = 4;  /* Unsupported network addr mask - switch
+                                     does not support arbitrary network
+                                     address mask. */
+    OFPBMC_BAD_WILDCARDS    = 5;  /* Unsupported combination of fields masked
+                                     or omitted in the match. */
+    OFPBMC_BAD_FIELD        = 6;  /* Unsupported field type in the match. */
+    OFPBMC_BAD_VALUE        = 7;  /* Unsupported value in a match field. */
+    OFPBMC_BAD_MASK         = 8;  /* Unsupported mask specified in the match,
+                                     field is not dl-address or nw-address. */
+    OFPBMC_BAD_PREREQ       = 9;  /* A prerequisite was not met. */
+    OFPBMC_DUP_FIELD        = 10; /* A field type was duplicated. */
+    OFPBMC_EPERM            = 11; /* Permissions error. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_FLOW_MOD_FAILED.  'data' contains
+ * at least the first 64 bytes of the failed request. */
+enum ofp_flow_mod_failed_code {
+    OFPFMFC_UNKNOWN      = 0;   /* Unspecified error. */
+    OFPFMFC_TABLE_FULL   = 1;   /* Flow not added because table was full. */
+    OFPFMFC_BAD_TABLE_ID = 2;   /* Table does not exist */
+    OFPFMFC_OVERLAP      = 3;   /* Attempted to add overlapping flow with
+                                   CHECK_OVERLAP flag set. */
+    OFPFMFC_EPERM        = 4;   /* Permissions error. */
+    OFPFMFC_BAD_TIMEOUT  = 5;   /* Flow not added because of unsupported
+                                   idle/hard timeout. */
+    OFPFMFC_BAD_COMMAND  = 6;   /* Unsupported or unknown command. */
+    OFPFMFC_BAD_FLAGS    = 7;   /* Unsupported or unknown flags. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_GROUP_MOD_FAILED.  'data' contains
+ * at least the first 64 bytes of the failed request. */
+enum ofp_group_mod_failed_code {
+    OFPGMFC_GROUP_EXISTS         = 0;  /* Group not added because a group ADD
+                                          attempted to replace an
+                                          already-present group. */
+    OFPGMFC_INVALID_GROUP        = 1;  /* Group not added because Group
+                                          specified is invalid. */
+    OFPGMFC_WEIGHT_UNSUPPORTED   = 2;  /* Switch does not support unequal load
+                                          sharing with select groups. */
+    OFPGMFC_OUT_OF_GROUPS        = 3;  /* The group table is full. */
+    OFPGMFC_OUT_OF_BUCKETS       = 4;  /* The maximum number of action buckets
+                                          for a group has been exceeded. */
+    OFPGMFC_CHAINING_UNSUPPORTED = 5;  /* Switch does not support groups that
+                                          forward to groups. */
+    OFPGMFC_WATCH_UNSUPPORTED    = 6;  /* This group cannot watch the
+                                          watch_port or watch_group specified.
+                                        */
+    OFPGMFC_LOOP                 = 7;  /* Group entry would cause a loop. */
+    OFPGMFC_UNKNOWN_GROUP        = 8;  /* Group not modified because a group
+                                          MODIFY attempted to modify a
+                                          non-existent group. */
+    OFPGMFC_CHAINED_GROUP        = 9;  /* Group not deleted because another
+                                          group is forwarding to it. */
+    OFPGMFC_BAD_TYPE             = 10; /* Unsupported or unknown group type. */
+    OFPGMFC_BAD_COMMAND          = 11; /* Unsupported or unknown command. */
+    OFPGMFC_BAD_BUCKET           = 12; /* Error in bucket. */
+    OFPGMFC_BAD_WATCH            = 13; /* Error in watch port/group. */
+    OFPGMFC_EPERM                = 14; /* Permissions error. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_PORT_MOD_FAILED.  'data' contains
+ * at least the first 64 bytes of the failed request. */
+enum ofp_port_mod_failed_code {
+    OFPPMFC_BAD_PORT      = 0;   /* Specified port number does not exist. */
+    OFPPMFC_BAD_HW_ADDR   = 1;   /* Specified hardware address does not
+                                  * match the port number. */
+    OFPPMFC_BAD_CONFIG    = 2;   /* Specified config is invalid. */
+    OFPPMFC_BAD_ADVERTISE = 3;   /* Specified advertise is invalid. */
+    OFPPMFC_EPERM         = 4;   /* Permissions error. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_TABLE_MOD_FAILED.  'data' contains
+ * at least the first 64 bytes of the failed request. */
+enum ofp_table_mod_failed_code {
+    OFPTMFC_BAD_TABLE  = 0;      /* Specified table does not exist. */
+    OFPTMFC_BAD_CONFIG = 1;      /* Specified config is invalid. */
+    OFPTMFC_EPERM      = 2;      /* Permissions error. */
+};
+
+/* ofp_error msg 'code' values for OFPET_QUEUE_OP_FAILED. 'data' contains
+ * at least the first 64 bytes of the failed request */
+enum ofp_queue_op_failed_code {
+    OFPQOFC_BAD_PORT   = 0;     /* Invalid port (or port does not exist). */
+    OFPQOFC_BAD_QUEUE  = 1;     /* Queue does not exist. */
+    OFPQOFC_EPERM      = 2;     /* Permissions error. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_SWITCH_CONFIG_FAILED. 'data' contains
+ * at least the first 64 bytes of the failed request. */
+enum ofp_switch_config_failed_code {
+    OFPSCFC_BAD_FLAGS  = 0;      /* Specified flags is invalid. */
+    OFPSCFC_BAD_LEN    = 1;      /* Specified len is invalid. */
+    OFPSCFC_EPERM      = 2;      /* Permissions error. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_ROLE_REQUEST_FAILED. 'data' contains
+ * at least the first 64 bytes of the failed request. */
+enum ofp_role_request_failed_code {
+    OFPRRFC_STALE      = 0;      /* Stale Message: old generation_id. */
+    OFPRRFC_UNSUP      = 1;      /* Controller role change unsupported. */
+    OFPRRFC_BAD_ROLE   = 2;      /* Invalid role. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_METER_MOD_FAILED.  'data' contains
+ * at least the first 64 bytes of the failed request. */
+enum ofp_meter_mod_failed_code {
+    OFPMMFC_UNKNOWN       = 0;  /* Unspecified error. */
+    OFPMMFC_METER_EXISTS  = 1;  /* Meter not added because a Meter ADD
+                                 * attempted to replace an existing Meter. */
+    OFPMMFC_INVALID_METER = 2;  /* Meter not added because Meter specified
+                                 * is invalid,
+                                 * or invalid meter in meter action. */
+    OFPMMFC_UNKNOWN_METER = 3;  /* Meter not modified because a Meter MODIFY
+                                 * attempted to modify a non-existent Meter,
+                                 * or bad meter in meter action. */
+    OFPMMFC_BAD_COMMAND   = 4;  /* Unsupported or unknown command. */
+    OFPMMFC_BAD_FLAGS     = 5;  /* Flag configuration unsupported. */
+    OFPMMFC_BAD_RATE      = 6;  /* Rate unsupported. */
+    OFPMMFC_BAD_BURST     = 7;  /* Burst size unsupported. */
+    OFPMMFC_BAD_BAND      = 8;  /* Band unsupported. */
+    OFPMMFC_BAD_BAND_VALUE = 9; /* Band value unsupported. */
+    OFPMMFC_OUT_OF_METERS = 10; /* No more meters available. */
+    OFPMMFC_OUT_OF_BANDS  = 11; /* The maximum number of properties
+                                 * for a meter has been exceeded. */
+};
+
+/* ofp_error_msg 'code' values for OFPET_TABLE_FEATURES_FAILED. 'data' contains
+ * at least the first 64 bytes of the failed request. */
+enum ofp_table_features_failed_code {
+    OFPTFFC_BAD_TABLE    = 0;      /* Specified table does not exist. */
+    OFPTFFC_BAD_METADATA = 1;      /* Invalid metadata mask. */
+    OFPTFFC_BAD_TYPE     = 2;      /* Unknown property type. */
+    OFPTFFC_BAD_LEN      = 3;      /* Length problem in properties. */
+    OFPTFFC_BAD_ARGUMENT = 4;      /* Unsupported property value. */
+    OFPTFFC_EPERM        = 5;      /* Permissions error. */
+};
+
+/* OFPT_ERROR: Error message (datapath -> controller). */
+message ofp_error_msg {
+    //ofp_header header;
+    uint32 type = 1;
+    uint32 code = 2;
+    bytes data = 3;          /* Variable-length data.  Interpreted based
+                                 on the type and code.  No padding. */
+};
+
+/* OFPET_EXPERIMENTER: Error message (datapath -> controller). */
+message ofp_error_experimenter_msg {
+    //ofp_header header;
+
+    uint32 type = 1;           /* OFPET_EXPERIMENTER. */
+    uint32 exp_type = 2;       /* Experimenter defined. */
+    uint32 experimenter = 3;   /* Experimenter ID which takes the same form
+                                    as in struct ofp_experimenter_header. */
+    bytes data = 4;              /* Variable-length data.  Interpreted based
+                                    on the type and code.  No padding. */
+};
+
+enum ofp_multipart_type {
+    /* Description of this OpenFlow switch.
+     * The request body is empty.
+     * The reply body is struct ofp_desc. */
+    OFPMP_DESC = 0;
+
+    /* Individual flow statistics.
+     * The request body is struct ofp_flow_stats_request.
+     * The reply body is an array of struct ofp_flow_stats. */
+    OFPMP_FLOW = 1;
+
+    /* Aggregate flow statistics.
+     * The request body is struct ofp_aggregate_stats_request.
+     * The reply body is struct ofp_aggregate_stats_reply. */
+    OFPMP_AGGREGATE = 2;
+
+    /* Flow table statistics.
+     * The request body is empty.
+     * The reply body is an array of struct ofp_table_stats. */
+    OFPMP_TABLE = 3;
+
+    /* Port statistics.
+     * The request body is struct ofp_port_stats_request.
+     * The reply body is an array of struct ofp_port_stats. */
+    OFPMP_PORT_STATS = 4;
+
+    /* Queue statistics for a port
+     * The request body is struct ofp_queue_stats_request.
+     * The reply body is an array of struct ofp_queue_stats */
+    OFPMP_QUEUE = 5;
+
+    /* Group counter statistics.
+     * The request body is struct ofp_group_stats_request.
+     * The reply is an array of struct ofp_group_stats. */
+    OFPMP_GROUP = 6;
+
+    /* Group description.
+     * The request body is empty.
+     * The reply body is an array of struct ofp_group_desc. */
+    OFPMP_GROUP_DESC = 7;
+
+    /* Group features.
+     * The request body is empty.
+     * The reply body is struct ofp_group_features. */
+    OFPMP_GROUP_FEATURES = 8;
+
+    /* Meter statistics.
+     * The request body is struct ofp_meter_multipart_requests.
+     * The reply body is an array of struct ofp_meter_stats. */
+    OFPMP_METER = 9;
+
+    /* Meter configuration.
+     * The request body is struct ofp_meter_multipart_requests.
+     * The reply body is an array of struct ofp_meter_config. */
+    OFPMP_METER_CONFIG = 10;
+
+    /* Meter features.
+     * The request body is empty.
+     * The reply body is struct ofp_meter_features. */
+    OFPMP_METER_FEATURES = 11;
+
+    /* Table features.
+     * The request body is either empty or contains an array of
+     * struct ofp_table_features containing the controller's
+     * desired view of the switch. If the switch is unable to
+     * set the specified view an error is returned.
+     * The reply body is an array of struct ofp_table_features. */
+    OFPMP_TABLE_FEATURES = 12;
+
+    /* Port description.
+     * The request body is empty.
+     * The reply body is an array of struct ofp_port. */
+    OFPMP_PORT_DESC = 13;
+
+    /* Experimenter extension.
+     * The request and reply bodies begin with
+     * struct ofp_experimenter_multipart_header.
+     * The request and reply bodies are otherwise experimenter-defined. */
+    OFPMP_EXPERIMENTER = 0xffff;
+};
+
+/* Backward compatibility with 1.3.1 - avoid breaking the API. */
+//#define ofp_multipart_types ofp_multipart_type
+
+enum ofp_multipart_request_flags {
+    OFPMPF_REQ_INVALID = 0;
+    OFPMPF_REQ_MORE  = 1;  /* More requests to follow. */
+};
+
+message ofp_multipart_request {
+    //ofp_header header;
+    ofp_multipart_type type = 1; /* One of the OFPMP_* constants. */
+    uint32 flags = 2;            /* OFPMPF_REQ_* flags. */
+    bytes body = 3;              /* Body of the request. 0 or more bytes. */
+};
+
+enum ofp_multipart_reply_flags {
+    OFPMPF_REPLY_INVALID = 0;
+    OFPMPF_REPLY_MORE  = 1;  /* More replies to follow. */
+};
+
+message ofp_multipart_reply {
+    //ofp_header header;
+    ofp_multipart_type type = 1; /* One of the OFPMP_* constants. */
+    uint32 flags = 2;            /* OFPMPF_REPLY_* flags. */
+    bytes body = 3;              /* Body of the reply. 0 or more bytes. */
+};
+
+//#define DESC_STR_LEN   256
+//#define SERIAL_NUM_LEN 32
+/* Body of reply to OFPMP_DESC request.  Each entry is a NULL-terminated
+ * ASCII string. */
+message ofp_desc {
+    string mfr_desc = 1;       /* Manufacturer description. */
+    string hw_desc = 2;        /* Hardware description. */
+    string sw_desc = 3;        /* Software description. */
+    string serial_num = 4;     /* Serial number. */
+    string dp_desc = 5;        /* Human readable description of datapath. */
+};
+
+/* Body for ofp_multipart_request of type OFPMP_FLOW. */
+message ofp_flow_stats_request {
+    uint32 table_id = 1;       /* ID of table to read (from ofp_table_stats),
+                                    OFPTT_ALL for all tables. */
+    uint32 out_port = 2;       /* Require matching entries to include this
+                                    as an output port.  A value of OFPP_ANY
+                                    indicates no restriction. */
+    uint32 out_group = 3;      /* Require matching entries to include this
+                                    as an output group.  A value of OFPG_ANY
+                                    indicates no restriction. */
+    uint64 cookie = 4;         /* Require matching entries to contain this
+                                    cookie value */
+    uint64 cookie_mask = 5;    /* Mask used to restrict the cookie bits that
+                                    must match. A value of 0 indicates
+                                    no restriction. */
+    ofp_match match = 6;         /* Fields to match. Variable size. */
+};
+
+/* Body of reply to OFPMP_FLOW request. */
+message ofp_flow_stats {
+    uint64 id = 14;            /* Unique ID of flow within device. */
+    uint32 table_id = 1;       /* ID of table flow came from. */
+    uint32 duration_sec = 2;   /* Time flow has been alive in seconds. */
+    uint32 duration_nsec = 3;  /* Time flow has been alive in nanoseconds
+                                  beyond duration_sec. */
+    uint32 priority = 4;       /* Priority of the entry. */
+    uint32 idle_timeout = 5;   /* Number of seconds idle before expiration. */
+    uint32 hard_timeout = 6;   /* Number of seconds before expiration. */
+    uint32 flags = 7;          /* Bitmap of OFPFF_* flags. */
+    uint64 cookie = 8;         /* Opaque controller-issued identifier. */
+    uint64 packet_count = 9;   /* Number of packets in flow. */
+    uint64 byte_count = 10;    /* Number of bytes in flow. */
+    ofp_match match = 12;      /* Description of fields. Variable size. */
+    repeated ofp_instruction instructions = 13; /* Instruction set
+                                                   (0 or more) */
+};
+
+/* Body for ofp_multipart_request of type OFPMP_AGGREGATE. */
+message ofp_aggregate_stats_request {
+    uint32 table_id = 1;      /* ID of table to read (from ofp_table_stats)
+                                 OFPTT_ALL for all tables. */
+    uint32 out_port = 2;      /* Require matching entries to include this
+                                 as an output port.  A value of OFPP_ANY
+                                 indicates no restriction. */
+    uint32 out_group = 3;     /* Require matching entries to include this
+                                 as an output group.  A value of OFPG_ANY
+                                 indicates no restriction. */
+    uint64 cookie = 4;        /* Require matching entries to contain this
+                                 cookie value */
+    uint64 cookie_mask = 5;   /* Mask used to restrict the cookie bits that
+                                 must match. A value of 0 indicates
+                                 no restriction. */
+    ofp_match match = 6;      /* Fields to match. Variable size. */
+};
+
+/* Body of reply to OFPMP_AGGREGATE request. */
+message ofp_aggregate_stats_reply {
+    uint64 packet_count = 1;   /* Number of packets in flows. */
+    uint64 byte_count = 2;     /* Number of bytes in flows. */
+    uint32 flow_count = 3;     /* Number of flows. */
+};
+
+/* Table Feature property types.
+ * Low order bit cleared indicates a property for a regular Flow Entry.
+ * Low order bit set indicates a property for the Table-Miss Flow Entry.
+ */
+enum ofp_table_feature_prop_type {
+    OFPTFPT_INSTRUCTIONS           = 0;  /* Instructions property. */
+    OFPTFPT_INSTRUCTIONS_MISS      = 1;  /* Instructions for table-miss. */
+    OFPTFPT_NEXT_TABLES            = 2;  /* Next Table property. */
+    OFPTFPT_NEXT_TABLES_MISS       = 3;  /* Next Table for table-miss. */
+    OFPTFPT_WRITE_ACTIONS          = 4;  /* Write Actions property. */
+    OFPTFPT_WRITE_ACTIONS_MISS     = 5;  /* Write Actions for table-miss. */
+    OFPTFPT_APPLY_ACTIONS          = 6;  /* Apply Actions property. */
+    OFPTFPT_APPLY_ACTIONS_MISS     = 7;  /* Apply Actions for table-miss. */
+    OFPTFPT_MATCH                  = 8;  /* Match property. */
+    OFPTFPT_WILDCARDS              = 10; /* Wildcards property. */
+    OFPTFPT_WRITE_SETFIELD         = 12; /* Write Set-Field property. */
+    OFPTFPT_WRITE_SETFIELD_MISS    = 13; /* Write Set-Field for table-miss. */
+    OFPTFPT_APPLY_SETFIELD         = 14; /* Apply Set-Field property. */
+    OFPTFPT_APPLY_SETFIELD_MISS    = 15; /* Apply Set-Field for table-miss. */
+    OFPTFPT_EXPERIMENTER           = 0xFFFE; /* Experimenter property. */
+    OFPTFPT_EXPERIMENTER_MISS      = 0xFFFF; /* Experimenter for table-miss. */
+};
+
+/* Common header for all Table Feature Properties */
+message ofp_table_feature_property {
+    ofp_table_feature_prop_type type = 1;   /* One of OFPTFPT_*. */
+    oneof value {
+        ofp_table_feature_prop_instructions instructions = 2;
+        ofp_table_feature_prop_next_tables next_tables = 3;
+        ofp_table_feature_prop_actions actions = 4;
+        ofp_table_feature_prop_oxm oxm = 5;
+        ofp_table_feature_prop_experimenter experimenter = 6;
+    }
+};
+
+/* Instructions property */
+message ofp_table_feature_prop_instructions {
+    /* One of OFPTFPT_INSTRUCTIONS,
+       OFPTFPT_INSTRUCTIONS_MISS. */
+    repeated ofp_instruction instructions = 1;   /* List of instructions */
+};
+
+/* Next Tables property */
+message ofp_table_feature_prop_next_tables {
+    /* One of OFPTFPT_NEXT_TABLES,
+       OFPTFPT_NEXT_TABLES_MISS. */
+    repeated uint32 next_table_ids = 1;     /* List of table ids. */
+};
+
+/* Actions property */
+message ofp_table_feature_prop_actions {
+    /* One of OFPTFPT_WRITE_ACTIONS,
+       OFPTFPT_WRITE_ACTIONS_MISS,
+       OFPTFPT_APPLY_ACTIONS,
+       OFPTFPT_APPLY_ACTIONS_MISS. */
+    repeated ofp_action actions = 1; /* List of actions */
+};
+
+/* Match, Wildcard or Set-Field property */
+message ofp_table_feature_prop_oxm {
+    /* One of OFPTFPT_MATCH,
+       OFPTFPT_WILDCARDS,
+       OFPTFPT_WRITE_SETFIELD,
+       OFPTFPT_WRITE_SETFIELD_MISS,
+       OFPTFPT_APPLY_SETFIELD,
+       OFPTFPT_APPLY_SETFIELD_MISS. */
+    /* TODO is this a uint32??? */
+    repeated uint32 oxm_ids = 3;    /* Array of OXM headers */
+};
+
+/* Experimenter table feature property */
+message ofp_table_feature_prop_experimenter {
+    /* One of OFPTFPT_EXPERIMENTER,
+       OFPTFPT_EXPERIMENTER_MISS. */
+    uint32         experimenter = 2; /* Experimenter ID which takes the same
+                                        form as in struct
+                                        ofp_experimenter_header. */
+    uint32         exp_type = 3;      /* Experimenter defined. */
+    repeated uint32 experimenter_data = 4;
+};
+
+/* Body for ofp_multipart_request of type OFPMP_TABLE_FEATURES./
+ * Body of reply to OFPMP_TABLE_FEATURES request. */
+message ofp_table_features {
+    uint32 table_id = 1;       /* Identifier of table.  Lower numbered tables
+                                are consulted first. */
+    string name = 2;
+    uint64 metadata_match = 3; /* Bits of metadata table can match. */
+    uint64 metadata_write = 4; /* Bits of metadata table can write. */
+    uint32 config = 5;         /* Bitmap of OFPTC_* values */
+    uint32 max_entries = 6;    /* Max number of entries supported. */
+
+    /* Table Feature Property list */
+    repeated ofp_table_feature_property properties = 7;
+};
+
+/* Body of reply to OFPMP_TABLE request. */
+message ofp_table_stats {
+    uint32 table_id = 1;      /* Identifier of table.  Lower numbered tables
+                                 are consulted first. */
+    uint32 active_count = 2;  /* Number of active entries. */
+    uint64 lookup_count = 3;  /* Number of packets looked up in table. */
+    uint64 matched_count = 4; /* Number of packets that hit table. */
+};
+
+/* Body for ofp_multipart_request of type OFPMP_PORT. */
+message ofp_port_stats_request {
+    uint32 port_no = 1;       /* OFPMP_PORT message must request statistics
+                               * either for a single port (specified in
+                               * port_no) or for all ports (if port_no ==
+                               * OFPP_ANY). */
+};
+
+/* Body of reply to OFPMP_PORT request. If a counter is unsupported, set
+ * the field to all ones. */
+message ofp_port_stats {
+    uint32 port_no = 1;
+    uint64 rx_packets = 2;   /* Number of received packets. */
+    uint64 tx_packets = 3;   /* Number of transmitted packets. */
+    uint64 rx_bytes = 4;     /* Number of received bytes. */
+    uint64 tx_bytes = 5;     /* Number of transmitted bytes. */
+    uint64 rx_dropped = 6;   /* Number of packets dropped by RX. */
+    uint64 tx_dropped = 7;   /* Number of packets dropped by TX. */
+    uint64 rx_errors = 8;    /* Number of receive errors.  This is a super-set
+                                of more specific receive errors and should be
+                                greater than or equal to the sum of all
+                                rx_*_err values. */
+    uint64 tx_errors = 9;    /* Number of transmit errors.  This is a super-set
+                                of more specific transmit errors and should be
+                                greater than or equal to the sum of all
+                                tx_*_err values (none currently defined.) */
+    uint64 rx_frame_err = 10;  /* Number of frame alignment errors. */
+    uint64 rx_over_err = 11;   /* Number of packets with RX overrun. */
+    uint64 rx_crc_err = 12;    /* Number of CRC errors. */
+    uint64 collisions = 13;    /* Number of collisions. */
+    uint32 duration_sec = 14;  /* Time port has been alive in seconds. */
+    uint32 duration_nsec = 15; /* Time port has been alive in nanoseconds
+                                  beyond duration_sec. */
+};
+
+/* Body of OFPMP_GROUP request. */
+message ofp_group_stats_request {
+    uint32 group_id = 1;      /* All groups if OFPG_ALL. */
+};
+
+/* Used in group stats replies. */
+message ofp_bucket_counter {
+    uint64 packet_count = 1;  /* Number of packets processed by bucket. */
+    uint64 byte_count = 2;    /* Number of bytes processed by bucket. */
+};
+
+/* Body of reply to OFPMP_GROUP request. */
+message ofp_group_stats {
+    uint32 group_id = 1;      /* Group identifier. */
+    uint32 ref_count = 2;     /* Number of flows or groups that directly
+                                 forward to this group. */
+    uint64 packet_count = 3;  /* Number of packets processed by group. */
+    uint64 byte_count = 4;    /* Number of bytes processed by group. */
+    uint32 duration_sec = 5;  /* Time group has been alive in seconds. */
+    uint32 duration_nsec = 6; /* Time group has been alive in nanoseconds
+                                 beyond duration_sec. */
+    repeated ofp_bucket_counter bucket_stats = 7; /* One counter set per
+                                                     bucket. */
+};
+
+/* Body of reply to OFPMP_GROUP_DESC request. */
+message ofp_group_desc {
+    ofp_group_type type = 1;       /* One of OFPGT_*. */
+    uint32 group_id = 2;           /* Group identifier. */
+    repeated ofp_bucket buckets = 3;   /* List of buckets - 0 or more. */
+};
+
+message ofp_group_entry {
+    ofp_group_desc desc = 1 [(voltha.yang_inline_node).id = 'desc',
+                            (voltha.yang_inline_node).type = 'openflow_13-ofp_group_desc'];
+    ofp_group_stats stats = 2;
+};
+
+/* Backward compatibility with 1.3.1 - avoid breaking the API. */
+//#define ofp_group_desc_stats ofp_group_desc
+
+/* Group configuration flags */
+enum ofp_group_capabilities {
+    OFPGFC_INVALID         = 0;
+    OFPGFC_SELECT_WEIGHT   = 1;  /* Support weight for select groups */
+    OFPGFC_SELECT_LIVENESS = 2;  /* Support liveness for select groups */
+    OFPGFC_CHAINING        = 4;  /* Support chaining groups */
+    OFPGFC_CHAINING_CHECKS = 8;  /* Check chaining for loops and delete */
+};
+
+/* Body of reply to OFPMP_GROUP_FEATURES request. Group features. */
+message ofp_group_features {
+    uint32  types = 1;         /* Bitmap of (1 << OFPGT_*) values supported. */
+    uint32  capabilities = 2;  /* Bitmap of OFPGFC_* capability supported. */
+    repeated uint32 max_groups = 3; /* Maximum number of groups for each type.
+                                     */
+    repeated uint32 actions = 4;    /* Bitmaps of (1 << OFPAT_*) values
+                                       supported. */
+};
+
+/* Body of OFPMP_METER and OFPMP_METER_CONFIG requests. */
+message ofp_meter_multipart_request {
+    uint32 meter_id = 1;      /* Meter instance, or OFPM_ALL. */
+};
+
+/* Statistics for each meter band */
+message ofp_meter_band_stats {
+    uint64        packet_band_count = 1;  /* Number of packets in band. */
+    uint64        byte_band_count = 2;    /* Number of bytes in band. */
+};
+
+/* Body of reply to OFPMP_METER request. Meter statistics. */
+message ofp_meter_stats {
+    uint32        meter_id = 1;        /* Meter instance. */
+    uint32        flow_count = 2;      /* Number of flows bound to meter. */
+    uint64        packet_in_count = 3; /* Number of packets in input. */
+    uint64        byte_in_count = 4;   /* Number of bytes in input. */
+    uint32        duration_sec = 5; /* Time meter has been alive in seconds. */
+    uint32        duration_nsec = 6;/* Time meter has been alive in nanoseconds
+                                       beyond duration_sec. */
+    repeated ofp_meter_band_stats band_stats = 7; /* The band_stats length is
+                                         inferred from the length field. */
+};
+
+/* Body of reply to OFPMP_METER_CONFIG request. Meter configuration. */
+message ofp_meter_config {
+    uint32        flags = 1;           /* All OFPMF_* that apply. */
+    uint32        meter_id = 2;        /* Meter instance. */
+    repeated ofp_meter_band_header bands = 3; /* The bands length is
+                                             inferred from the length field. */
+};
+
+/* Body of reply to OFPMP_METER_FEATURES request. Meter features. */
+message ofp_meter_features {
+    uint32    max_meter = 1;    /* Maximum number of meters. */
+    uint32    band_types = 2;   /* Bitmaps of (1 << OFPMBT_*) values supported.
+                                 */
+    uint32    capabilities = 3; /* Bitmaps of "ofp_meter_flags". */
+    uint32    max_bands = 4;    /* Maximum bands per meters */
+    uint32    max_color = 5;    /* Maximum color value */
+};
+
+/* Body for ofp_multipart_request/reply of type OFPMP_EXPERIMENTER. */
+message ofp_experimenter_multipart_header {
+    uint32 experimenter = 1;   /* Experimenter ID which takes the same form
+                                  as in struct ofp_experimenter_header. */
+    uint32 exp_type = 2;       /* Experimenter defined. */
+    bytes data = 3; /* Experimenter-defined arbitrary additional data. */
+};
+
+/* Experimenter extension. */
+message ofp_experimenter_header {
+    //ofp_header header;  /* Type OFPT_EXPERIMENTER. */
+    uint32 experimenter = 1;     /* Experimenter ID:
+                                 * - MSB 0: low-order bytes are IEEE OUI.
+                                 * - MSB != 0: defined by ONF. */
+    uint32 exp_type = 2;         /* Experimenter defined. */
+    bytes data = 3; /* Experimenter-defined arbitrary additional data. */
+};
+
+/* All ones is used to indicate all queues in a port (for stats retrieval). */
+//#define OFPQ_ALL      0xffffffff
+
+/* Min rate > 1000 means not configured. */
+//#define OFPQ_MIN_RATE_UNCFG      0xffff
+
+/* Max rate > 1000 means not configured. */
+//#define OFPQ_MAX_RATE_UNCFG      0xffff
+
+enum ofp_queue_properties {
+    OFPQT_INVALID       = 0;
+    OFPQT_MIN_RATE      = 1;      /* Minimum datarate guaranteed. */
+    OFPQT_MAX_RATE      = 2;      /* Maximum datarate. */
+    OFPQT_EXPERIMENTER  = 0xffff; /* Experimenter defined property. */
+};
+
+/* Common description for a queue. */
+message ofp_queue_prop_header {
+    uint32 property = 1;   /* One of OFPQT_. */
+    uint32 len = 2;        /* Length of property, including this header. */
+};
+
+/* Min-Rate queue property description. */
+message ofp_queue_prop_min_rate {
+    ofp_queue_prop_header prop_header = 1;/* prop: OFPQT_MIN, len: 16. */
+    uint32 rate = 2;       /* In 1/10 of a percent = 0;>1000 -> disabled. */
+};
+
+/* Max-Rate queue property description. */
+message ofp_queue_prop_max_rate {
+    ofp_queue_prop_header prop_header = 1;/* prop: OFPQT_MAX, len: 16. */
+    uint32 rate = 2;       /* In 1/10 of a percent = 0;>1000 -> disabled. */
+};
+
+/* Experimenter queue property description. */
+message ofp_queue_prop_experimenter {
+    ofp_queue_prop_header prop_header = 1;/* prop: OFPQT_EXPERIMENTER */
+    uint32 experimenter = 2;         /* Experimenter ID which takes the same
+                                          form as in struct
+                                          ofp_experimenter_header. */
+    bytes data = 3;                    /* Experimenter defined data. */
+};
+
+/* Full description for a queue. */
+message ofp_packet_queue {
+    uint32 queue_id = 1;    /* id for the specific queue. */
+    uint32 port = 2;        /* Port this queue is attached to. */
+    repeated ofp_queue_prop_header properties = 4; /* List of properties. */
+};
+
+/* Query for port queue configuration. */
+message ofp_queue_get_config_request {
+    //ofp_header header;
+    uint32 port = 1;        /* Port to be queried. Should refer
+                              to a valid physical port (i.e. <= OFPP_MAX),
+                              or OFPP_ANY to request all configured
+                              queues.*/
+};
+
+/* Queue configuration for a given port. */
+message ofp_queue_get_config_reply {
+    //ofp_header header;
+    uint32 port = 1;
+    repeated ofp_packet_queue queues = 2; /* List of configured queues. */
+};
+
+/* OFPAT_SET_QUEUE action struct: send packets to given queue on port. */
+message ofp_action_set_queue {
+    uint32 type = 1;           /* OFPAT_SET_QUEUE. */
+    uint32 queue_id = 3;       /* Queue id for the packets. */
+};
+
+message ofp_queue_stats_request {
+    uint32 port_no = 1;       /* All ports if OFPP_ANY. */
+    uint32 queue_id = 2;      /* All queues if OFPQ_ALL. */
+};
+
+message ofp_queue_stats {
+    uint32 port_no = 1;
+    uint32 queue_id = 2;      /* Queue i.d */
+    uint64 tx_bytes = 3;      /* Number of transmitted bytes. */
+    uint64 tx_packets = 4;    /* Number of transmitted packets. */
+    uint64 tx_errors = 5;     /* Number of packets dropped due to overrun. */
+    uint32 duration_sec = 6;  /* Time queue has been alive in seconds. */
+    uint32 duration_nsec = 7; /* Time queue has been alive in nanoseconds
+                                 beyond duration_sec. */
+};
+
+/* Configures the "role" of the sending controller.  The default role is:
+ *
+ *    - Equal (OFPCR_ROLE_EQUAL), which allows the controller access to all
+ *      OpenFlow features. All controllers have equal responsibility.
+ *
+ * The other possible roles are a related pair:
+ *
+ *    - Master (OFPCR_ROLE_MASTER) is equivalent to Equal, except that there
+ *      may be at most one Master controller at a time: when a controller
+ *      configures itself as Master, any existing Master is demoted to the
+ *      Slave role.
+ *
+ *    - Slave (OFPCR_ROLE_SLAVE) allows the controller read-only access to
+ *      OpenFlow features.  In particular attempts to modify the flow table
+ *      will be rejected with an OFPBRC_EPERM error.
+ *
+ *      Slave controllers do not receive OFPT_PACKET_IN or OFPT_FLOW_REMOVED
+ *      messages, but they do receive OFPT_PORT_STATUS messages.
+ */
+
+/* Controller roles. */
+enum ofp_controller_role {
+    OFPCR_ROLE_NOCHANGE = 0;    /* Don't change current role. */
+    OFPCR_ROLE_EQUAL    = 1;    /* Default role, full access. */
+    OFPCR_ROLE_MASTER   = 2;    /* Full access, at most one master. */
+    OFPCR_ROLE_SLAVE    = 3;    /* Read-only access. */
+};
+
+/* Role request and reply message. */
+message ofp_role_request {
+    //ofp_header header;        /* Type OFPT_ROLE_REQUEST/OFPT_ROLE_REPLY. */
+    ofp_controller_role role = 1; /* One of OFPCR_ROLE_*. */
+    uint64 generation_id = 2;     /* Master Election Generation Id */
+};
+
+/* Asynchronous message configuration. */
+message ofp_async_config {
+    //ofp_header header;    /* OFPT_GET_ASYNC_REPLY or OFPT_SET_ASYNC. */
+    repeated uint32 packet_in_mask = 1;   /* Bitmasks of OFPR_* values. */
+    repeated uint32 port_status_mask = 2; /* Bitmasks of OFPPR_* values. */
+    repeated uint32 flow_removed_mask = 3;/* Bitmasks of OFPRR_* values. */
+};
+
+
+/* ADDITIONAL VOLTHA SPECIFIC MESSAGE TYPES, AIDING RPC CALLS */
+
+message FlowTableUpdate {
+    string id = 1;  // Device.id or LogicalDevice.id
+    ofp_flow_mod flow_mod = 2;
+}
+
+message FlowGroupTableUpdate {
+    string id = 1;  // Device.id or LogicalDevice.id
+    ofp_group_mod group_mod = 2;
+}
+
+message Flows {
+    repeated ofp_flow_stats items = 1;
+}
+
+message FlowGroups {
+    repeated ofp_group_entry items = 1;
+}
+
+message FlowChanges {
+    Flows to_add = 1;
+    Flows to_remove = 2;
+}
+
+message FlowGroupChanges {
+    FlowGroups to_add = 1;
+    FlowGroups to_remove = 2;
+}
+
+message PacketIn {
+    string id = 1;  // LogicalDevice.id
+    ofp_packet_in packet_in = 2;
+}
+
+message PacketOut {
+    string id = 1;  // LogicalDevice.id
+    ofp_packet_out packet_out = 2;
+}
+
+message ChangeEvent {
+    string id = 1; // LogicalDevice.id
+    oneof event {
+        ofp_port_status port_status = 2;
+    }
+}
diff --git a/protos/ponsim.proto b/protos/ponsim.proto
new file mode 100644
index 0000000..2ed8914
--- /dev/null
+++ b/protos/ponsim.proto
@@ -0,0 +1,57 @@
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/voltha";
+
+package voltha;
+
+import "google/protobuf/empty.proto";
+import "openflow_13.proto";
+
+
+message PonSimDeviceInfo {
+    int32 nni_port = 1;
+    repeated int32 uni_ports = 2;
+}
+
+message FlowTable {
+    int32 port = 1;  // Used to address right device
+    repeated openflow_13.ofp_flow_stats flows = 2;
+}
+
+message PonSimFrame {
+    string id = 1;
+    bytes payload = 2;
+}
+
+message PonSimPacketCounter {
+    string name = 1;
+    int64 value = 2;
+}
+
+message PonSimPortMetrics {
+    string port_name = 1;
+    repeated PonSimPacketCounter packets = 2;
+}
+
+message PonSimMetrics {
+    string device = 1;
+    repeated PonSimPortMetrics metrics = 2;
+}
+
+service PonSim {
+    rpc SendFrame(PonSimFrame)
+        returns (google.protobuf.Empty) {}
+
+    rpc ReceiveFrames(google.protobuf.Empty)
+        returns (stream PonSimFrame) {}
+
+    rpc GetDeviceInfo(google.protobuf.Empty)
+        returns(PonSimDeviceInfo) {}
+
+    rpc UpdateFlowTable(FlowTable)
+        returns(google.protobuf.Empty) {}
+
+    rpc GetStats(google.protobuf.Empty)
+        returns(PonSimMetrics) {}
+
+}
diff --git a/protos/schema.proto b/protos/schema.proto
new file mode 100644
index 0000000..bb1f895
--- /dev/null
+++ b/protos/schema.proto
@@ -0,0 +1,40 @@
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/schema";
+
+package schema;
+
+import "google/api/annotations.proto";
+import "google/protobuf/empty.proto";
+
+// Contains the name and content of a *.proto file
+message ProtoFile {
+    string file_name = 1;  // name of proto file
+    string proto = 2;  // content of proto file
+    bytes descriptor = 3;  // compiled descriptor for proto (zlib compressed)
+}
+
+// Proto files and compiled descriptors for this interface
+message Schemas {
+
+    // Proto files
+    repeated ProtoFile protos = 1;
+
+    // Proto file name from which swagger.json shall be generated
+    string swagger_from = 2;
+
+    // Proto file name from which yang schemas shall be generated
+    string yang_from = 3;
+}
+
+// Schema services
+service SchemaService {
+
+    // Return active grpc schemas
+    rpc GetSchema(google.protobuf.Empty) returns (Schemas) {
+        option (google.api.http) = {
+            get: "/schema"
+        };
+    }
+
+}
diff --git a/protos/scripts/build_protos.sh b/protos/scripts/build_protos.sh
new file mode 100644
index 0000000..faac725
--- /dev/null
+++ b/protos/scripts/build_protos.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+
+export SRC_DIR="$1"
+
+echo $SRC_DIR
+
+export MAPS=Mgoogle/protobuf/descriptor.proto=github.com/golang/protobuf/protoc-gen-go/descriptor
+export INCS="\
+    -I $SRC_DIR \
+    -I $GOPATH/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis"
+
+export VOLTHA_PB="\
+    $SRC_DIR/adapter.proto \
+    $SRC_DIR/device.proto \
+    $SRC_DIR/events.proto \
+    $SRC_DIR/health.proto \
+    $SRC_DIR/logical_device.proto \
+    $SRC_DIR/ponsim.proto \
+    $SRC_DIR/voltha.proto"
+
+export COMMON_PB="\
+    $SRC_DIR/common.proto \
+    $SRC_DIR/meta.proto \
+    $SRC_DIR/yang_options.proto"
+
+export CORE_ADAPTER_PB="$SRC_DIR/core_adapter.proto"
+export SCHEMA_PB="$SRC_DIR/schema.proto"
+export IETF_PB="$SRC_DIR/ietf_interfaces.proto"
+export OF_PB="$SRC_DIR/openflow_13.proto"
+export OMCI_PB="$SRC_DIR/omci*.proto"
+
+export PB_VARS="\
+    VOLTHA_PB \
+    COMMON_PB \
+    CORE_ADAPTER_PB \
+    SCHEMA_PB \
+    IETF_PB \
+    OF_PB \
+    OMCI_PB"
+
+for pb_var in $PB_VARS
+do
+    pbs="$(eval echo \$$pb_var)"
+    echo "Compiling $pbs"
+    protoc --go_out=$MAPS,plugins=grpc:$GOPATH/src $INCS $pbs
+done
diff --git a/protos/voltha.proto b/protos/voltha.proto
new file mode 100644
index 0000000..a107bd2
--- /dev/null
+++ b/protos/voltha.proto
@@ -0,0 +1,505 @@
+/*
+ * Top-level Voltha API definition
+ *
+ * For details, see individual definition files.
+ */
+
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/voltha";
+
+package voltha;
+
+import "google/protobuf/empty.proto";
+import "google/api/annotations.proto";
+
+import "yang_options.proto";
+
+import public "meta.proto";
+import public "common.proto";
+import public "health.proto";
+import public "logical_device.proto";
+import public "device.proto";
+import public "adapter.proto";
+import public "openflow_13.proto";
+import "omci_mib_db.proto";
+
+
+option java_package = "org.opencord.voltha";
+option java_outer_classname = "VolthaProtos";
+option csharp_namespace = "Opencord.Voltha.Voltha";
+
+message DeviceGroup {
+
+    string id = 1 [(access) = READ_ONLY];
+
+    repeated LogicalDevice logical_devices = 2 [(child_node) = {key: "id"}];
+
+    repeated Device devices = 3 [(child_node) = {key: "id"}];
+}
+
+message DeviceGroups {
+    repeated DeviceGroup items = 1;
+}
+
+
+message AlarmFilterRuleKey {
+    option (yang_child_rule) = MOVE_TO_PARENT_LEVEL;
+
+    enum AlarmFilterRuleKey {
+        id = 0;
+        type = 1;
+        severity = 2;
+        resource_id = 3;
+        category = 4;
+        device_id = 5;
+    }
+}
+
+message AlarmFilterRule {
+    AlarmFilterRuleKey.AlarmFilterRuleKey key = 1;
+    string value = 2;
+}
+message AlarmFilter {
+    string id = 1 [(access) = READ_ONLY];
+
+    repeated AlarmFilterRule rules = 2;
+}
+
+message AlarmFilters {
+    repeated AlarmFilter filters = 1;
+}
+
+// Top-level (root) node for a Voltha Instance
+message VolthaInstance {
+    option (yang_message_rule) = CREATE_BOTH_GROUPING_AND_CONTAINER;
+
+    string instance_id = 1  [(access) = READ_ONLY];
+
+    string version = 2 [(access) = READ_ONLY];
+
+    LogLevel.LogLevel log_level = 3;
+
+    HealthStatus health = 10 [(child_node) = {}];
+
+    repeated Adapter adapters = 11 [(child_node) = {key: "id" }];
+
+    repeated LogicalDevice logical_devices = 12 [(child_node) = {key: "id"}];
+
+    repeated Device devices = 13 [(child_node) = {key: "id"}];
+
+    repeated DeviceType device_types = 14 [(child_node) = {key: "id"}];
+
+    repeated DeviceGroup device_groups = 15 [(child_node) = {key: "id"}];
+
+    repeated AlarmFilter alarm_filters = 16 [(child_node) = {key: "id"}];
+
+    repeated
+        omci.MibDeviceData omci_mibs = 28
+        [(child_node) = {key: "device_id"}];
+}
+
+message VolthaInstances {
+    option (yang_message_rule) = CREATE_BOTH_GROUPING_AND_CONTAINER;
+    repeated string items = 1;
+}
+
+// Voltha representing the entire Voltha cluster
+message Voltha {
+    option (yang_message_rule) = CREATE_BOTH_GROUPING_AND_CONTAINER;
+
+    string version = 1 [(access) = READ_ONLY];
+
+    LogLevel.LogLevel log_level = 2;
+
+    repeated VolthaInstance instances = 3 [(child_node) = {key: "instance_id"}];
+
+    repeated Adapter adapters = 11 [(child_node) = {key: "id"}];
+
+    repeated LogicalDevice logical_devices = 12 [(child_node) = {key: "id"}];
+
+    repeated Device devices = 13 [(child_node) = {key: "id"}];
+
+    repeated DeviceGroup device_groups = 15 [(child_node) = {key: "id"}];
+
+    repeated
+        omci.MibDeviceData omci_mib_database = 28
+        [(child_node) = {key: "device_id"}];
+}
+
+// Device Self Test Response
+message SelfTestResponse {
+    option (yang_child_rule) = MOVE_TO_PARENT_LEVEL;
+
+	enum SelfTestResult  {
+	    SUCCESS = 0;
+	    FAILURE = 1;
+	    NOT_SUPPORTED = 2;
+	    UNKNOWN_ERROR = 3;
+    }
+    SelfTestResult result = 1;
+}
+
+message OfAgentSubscriber {
+    // ID of ofagent instance
+    string ofagent_id = 1;
+
+    // ID of voltha instance to which the ofagent is subscribed
+    string voltha_id = 2;
+}
+
+/*
+ * Voltha APIs
+ *
+ */
+service VolthaService {
+
+    // Get high level information on the Voltha cluster
+    rpc GetVoltha(google.protobuf.Empty) returns(Voltha) {
+        option (google.api.http) = {
+            get: "/api/v1"
+        };
+    }
+
+    // List all Voltha cluster instances
+    rpc ListVolthaInstances(google.protobuf.Empty) returns(VolthaInstances) {
+        option (google.api.http) = {
+            get: "/api/v1/instances"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'items';
+        option (voltha.yang_xml_tag).list_items_name = 'items';
+    }
+
+    // Get details on a Voltha cluster instance
+    rpc GetVolthaInstance(ID) returns(VolthaInstance) {
+        option (google.api.http) = {
+            get: "/api/v1/instances/{id}"
+        };
+    }
+
+    // List all active adapters (plugins) in the Voltha cluster
+    rpc ListAdapters(google.protobuf.Empty) returns(Adapters) {
+        option (google.api.http) = {
+            get: "/api/v1/adapters"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'adapters';
+    }
+
+
+    // List all logical devices managed by the Voltha cluster
+    rpc ListLogicalDevices(google.protobuf.Empty) returns(LogicalDevices) {
+        option (google.api.http) = {
+            get: "/api/v1/logical_devices"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'logical_devices';
+    }
+
+    // Get additional information on a given logical device
+    rpc GetLogicalDevice(ID) returns(LogicalDevice) {
+        option (google.api.http) = {
+            get: "/api/v1/logical_devices/{id}"
+        };
+    }
+
+    // List ports of a logical device
+    rpc ListLogicalDevicePorts(ID) returns(LogicalPorts) {
+        option (google.api.http) = {
+            get: "/api/v1/logical_devices/{id}/ports"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'ports';
+    }
+
+    // Gets a logical device port
+    rpc GetLogicalDevicePort(LogicalPortId) returns(LogicalPort) {
+        option (google.api.http) = {
+            get: "/api/v1/logical_devices/{id}/ports/{port_id}"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'port';
+    }
+
+    // Enables a logical device port
+    rpc EnableLogicalDevicePort(LogicalPortId) returns(google.protobuf.Empty) {
+        option (google.api.http) = {
+            post: "/api/v1/logical_devices/{id}/ports/{port_id}/enable"
+        };
+    }
+
+    // Disables a logical device port
+    rpc DisableLogicalDevicePort(LogicalPortId) returns(google.protobuf.Empty) {
+        option (google.api.http) = {
+            post: "/api/v1/logical_devices/{id}/ports/{port_id}/disable"
+        };
+    }
+
+    // List all flows of a logical device
+    rpc ListLogicalDeviceFlows(ID) returns(openflow_13.Flows) {
+        option (google.api.http) = {
+            get: "/api/v1/logical_devices/{id}/flows"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'flows';
+        option (voltha.yang_xml_tag).list_items_name = 'items';
+    }
+
+    // Update flow table for logical device
+    rpc UpdateLogicalDeviceFlowTable(openflow_13.FlowTableUpdate)
+            returns(google.protobuf.Empty) {
+        option (google.api.http) = {
+            post: "/api/v1/logical_devices/{id}/flows"
+            body: "*"
+        };
+    }
+
+    // List all flow groups of a logical device
+    rpc ListLogicalDeviceFlowGroups(ID) returns(openflow_13.FlowGroups) {
+        option (google.api.http) = {
+            get: "/api/v1/logical_devices/{id}/flow_groups"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'flow_groups';
+        option (voltha.yang_xml_tag).list_items_name = 'items';
+    }
+
+    // Update group table for device
+    rpc UpdateLogicalDeviceFlowGroupTable(openflow_13.FlowGroupTableUpdate)
+            returns(google.protobuf.Empty) {
+        option (google.api.http) = {
+            post: "/api/v1/logical_devices/{id}/flow_groups"
+            body: "*"
+        };
+    }
+
+    // List all physical devices controlled by the Voltha cluster
+    rpc ListDevices(google.protobuf.Empty) returns(Devices) {
+        option (google.api.http) = {
+            get: "/api/v1/devices"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'devices';
+    }
+
+    // Get more information on a given physical device
+    rpc GetDevice(ID) returns(Device) {
+        option (google.api.http) = {
+            get: "/api/v1/devices/{id}"
+        };
+    }
+
+    // Pre-provision a new physical device
+    rpc CreateDevice(Device) returns(Device) {
+        option (google.api.http) = {
+            post: "/api/v1/devices"
+            body: "*"
+        };
+    }
+
+    // Enable a device.  If the device was in pre-provisioned state then it
+    // will transition to ENABLED state.  If it was is DISABLED state then it
+    // will transition to ENABLED state as well.
+    rpc EnableDevice(ID) returns(google.protobuf.Empty) {
+        option (google.api.http) = {
+            post: "/api/v1/devices/{id}/enable"
+        };
+    }
+
+    // Disable a device
+    rpc DisableDevice(ID) returns(google.protobuf.Empty) {
+        option (google.api.http) = {
+            post: "/api/v1/devices/{id}/disable"
+        };
+    }
+
+    // Reboot a device
+    rpc RebootDevice(ID) returns(google.protobuf.Empty) {
+        option (google.api.http) = {
+            post: "/api/v1/devices/{id}/reboot"
+        };
+    }
+
+    // Delete a device
+    rpc DeleteDevice(ID) returns(google.protobuf.Empty) {
+        option (google.api.http) = {
+            delete: "/api/v1/devices/{id}/delete"
+        };
+    }
+
+    // Request an image download to the standby partition
+    // of a device.
+    // Note that the call is expected to be non-blocking.
+    rpc DownloadImage(ImageDownload) returns(OperationResp) {
+        option (google.api.http) = {
+            post: "/api/v1/devices/{id}/image_downloads/{name}"
+            body: "*"
+        };
+    }
+
+    // Get image download status on a device
+    // The request retrieves progress on device and updates db record
+    rpc GetImageDownloadStatus(ImageDownload) returns(ImageDownload) {
+        option (google.api.http) = {
+            get: "/api/v1/devices/{id}/image_downloads/{name}/status"
+        };
+    }
+
+    // Get image download db record
+    rpc GetImageDownload(ImageDownload) returns(ImageDownload) {
+        option (google.api.http) = {
+            get: "/api/v1/devices/{id}/image_downloads/{name}"
+        };
+    }
+
+    // List image download db records for a given device
+    rpc ListImageDownloads(ID) returns(ImageDownloads) {
+        option (google.api.http) = {
+            get: "/api/v1/devices/{id}/image_downloads"
+        };
+    }
+
+    // Cancel an existing image download process on a device
+    rpc CancelImageDownload(ImageDownload) returns(OperationResp) {
+        option (google.api.http) = {
+            delete: "/api/v1/devices/{id}/image_downloads/{name}"
+        };
+    }
+
+    // Activate the specified image at a standby partition
+    // to active partition.
+    // Depending on the device implementation, this call
+    // may or may not cause device reboot.
+    // If no reboot, then a reboot is required to make the
+    // activated image running on device
+    // Note that the call is expected to be non-blocking.
+    rpc ActivateImageUpdate(ImageDownload) returns(OperationResp) {
+        option (google.api.http) = {
+            post: "/api/v1/devices/{id}/image_downloads/{name}/image_update"
+            body: "*"
+        };
+    }
+
+    // Revert the specified image at standby partition
+    // to active partition, and revert to previous image
+    // Depending on the device implementation, this call
+    // may or may not cause device reboot.
+    // If no reboot, then a reboot is required to make the
+    // previous image running on device
+    // Note that the call is expected to be non-blocking.
+    rpc RevertImageUpdate(ImageDownload) returns(OperationResp) {
+        option (google.api.http) = {
+            post: "/api/v1/devices/{id}/image_downloads/{name}/image_revert"
+            body: "*"
+        };
+    }
+
+    // List ports of a device
+    rpc ListDevicePorts(ID) returns(Ports) {
+        option (google.api.http) = {
+            get: "/api/v1/devices/{id}/ports"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'ports';
+    }
+
+    // List pm config of a device
+    rpc ListDevicePmConfigs(ID) returns(PmConfigs) {
+        option (google.api.http) = {
+            get: "/api/v1/devices/{id}/pm_configs"
+        };
+    }
+
+    // Update the pm config of a device
+    rpc UpdateDevicePmConfigs(voltha.PmConfigs) returns(google.protobuf.Empty) {
+        option (google.api.http) = {
+            post: "/api/v1/devices/{id}/pm_configs"
+            body: "*"
+        };
+    }
+
+    // List all flows of a device
+    rpc ListDeviceFlows(ID) returns(openflow_13.Flows) {
+        option (google.api.http) = {
+            get: "/api/v1/devices/{id}/flows"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'flows';
+        option (voltha.yang_xml_tag).list_items_name = 'items';
+    }
+
+    // List all flow groups of a device
+    rpc ListDeviceFlowGroups(ID) returns(openflow_13.FlowGroups) {
+        option (google.api.http) = {
+            get: "/api/v1/devices/{id}/flow_groups"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'flow_groups';
+        option (voltha.yang_xml_tag).list_items_name = 'items';
+    }
+
+    // List device types known to Voltha
+    rpc ListDeviceTypes(google.protobuf.Empty) returns(DeviceTypes) {
+        option (google.api.http) = {
+            get: "/api/v1/device_types"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'device_types';
+    }
+
+    // Get additional information on a device type
+    rpc GetDeviceType(ID) returns(DeviceType) {
+        option (google.api.http) = {
+            get: "/api/v1/device_types/{id}"
+        };
+    }
+
+    // List all device sharding groups
+    rpc ListDeviceGroups(google.protobuf.Empty) returns(DeviceGroups) {
+        option (google.api.http) = {
+            get: "/api/v1/device_groups"
+        };
+        option (voltha.yang_xml_tag).xml_tag = 'device_groups';
+    }
+
+    // Get additional information on a device group
+    rpc GetDeviceGroup(ID) returns(DeviceGroup) {
+        option (google.api.http) = {
+            get: "/api/v1/device_groups/{id}"
+        };
+    }
+
+    rpc CreateAlarmFilter(AlarmFilter) returns(AlarmFilter) {
+        option (google.api.http) = {
+            post: "/api/v1/alarm_filters"
+            body: "*"
+        };
+    }
+
+    rpc GetAlarmFilter(ID) returns(AlarmFilter) {
+        option (google.api.http) = {
+            get: "/api/v1/alarm_filters/{id}"
+        };
+    }
+
+    rpc UpdateAlarmFilter(AlarmFilter) returns(AlarmFilter) {
+        option (google.api.http) = {
+            put: "/api/v1/alarm_filters/{id}"
+            body: "*"
+        };
+    }
+
+    rpc DeleteAlarmFilter(ID) returns(google.protobuf.Empty) {
+        option (google.api.http) = {
+            delete: "/api/v1/alarm_filters/{id}"
+        };
+    }
+
+    rpc ListAlarmFilters(google.protobuf.Empty) returns(AlarmFilters) {
+        option (google.api.http) = {
+            get: "/api/v1/alarm_filters"
+        };
+    }
+
+    rpc GetImages(ID) returns(Images) {
+        option (google.api.http) = {
+            get: "/api/v1/devices/{id}/images"
+        };
+    }
+
+    rpc SelfTest(ID) returns(SelfTestResponse) {
+        option (google.api.http) = {
+            post: "/api/v1/devices/{id}/self_test"
+        };
+    }
+}
+
diff --git a/protos/yang_options.proto b/protos/yang_options.proto
new file mode 100644
index 0000000..25f70a8
--- /dev/null
+++ b/protos/yang_options.proto
@@ -0,0 +1,74 @@
+// Copyright (c) 2015, Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file contains annotation definitions that can be used to describe
+// a configuration tree.
+
+syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-go/protos/common";
+
+package voltha;
+
+import "google/protobuf/descriptor.proto";
+
+enum MessageParserOption {
+    // Move any enclosing child enum/message definition to the same level
+    // as the parent (this message) in the yang generated file
+    MOVE_TO_PARENT_LEVEL= 0;
+
+    // Create both a grouping and a container for this message.  The container
+    // name will be the message name.  The grouping name will be the message
+    // name prefixed with "grouping_"
+    CREATE_BOTH_GROUPING_AND_CONTAINER = 1;
+}
+
+message InlineNode {
+    string id = 1;
+    string type = 2;
+}
+
+message RpcReturnDef {
+    // The gRPC methods return message types.  NETCONF expects an actual
+    // attribute as defined in the YANG schema.  The xnl_tag will be used
+    // as the top most tag when translating a gRPC response into an xml
+    // response
+    string xml_tag = 1;
+
+    // When the gRPC response is a list of items, we need to differentiate
+    // between a YANG schema attribute whose name is "items" and when "items"
+    // is used only to indicate a list of items is being returned.  The default
+    // behavior assumes a list is returned when "items" is present in
+    // the response.  This option will therefore be used when the attribute
+    // name in the YANG schema is 'items'
+    string list_items_name = 2;
+}
+
+extend google.protobuf.MessageOptions {
+    // This annotation is used to indicate how a message is parsed when
+    // converting from proto to yang format.
+    MessageParserOption yang_child_rule = 7761774;
+
+    MessageParserOption yang_message_rule = 7761775;
+}
+
+extend google.protobuf.FieldOptions {
+    // If present, the field (a message reference) should be replaced by the
+    // message itself.  For now, this applies only to non-repeated fields.
+    InlineNode yang_inline_node = 7761776;
+}
+
+extend google.protobuf.MethodOptions {
+    RpcReturnDef yang_xml_tag = 7761777;
+}
diff --git a/rw_core/config/config.go b/rw_core/config/config.go
index a223318..8b2c165 100644
--- a/rw_core/config/config.go
+++ b/rw_core/config/config.go
@@ -24,7 +24,7 @@
 	default_KVStoreTimeout   = 5 //in seconds
 	default_KVStoreHost      = "10.100.198.240"
 	default_KVStorePort      = 8500 // Etcd = 2379
-	default_LogLevel         = 1
+	default_LogLevel         = 0
 	default_Banner           = false
 	default_CoreTopic        = "rwcore"
 	default_RWCoreEndpoint   = "rwcore"
diff --git a/rw_core/core/requestHandlerProxy.go b/rw_core/core/requestHandlerProxy.go
new file mode 100644
index 0000000..4bfafa5
--- /dev/null
+++ b/rw_core/core/requestHandlerProxy.go
@@ -0,0 +1,154 @@
+package core
+
+import (
+	"github.com/opencord/voltha-go/common/log"
+	ca "github.com/opencord/voltha-go/protos/core_adapter"
+	"github.com/opencord/voltha-go/protos/voltha"
+	"github.com/golang/protobuf/ptypes"
+	"errors"
+)
+
+type RequestHandlerProxy struct {
+	TestMode bool
+}
+
+func (rhp *RequestHandlerProxy) GetDevice(args []*ca.Argument)(error, *voltha.Device) {
+	if len(args) != 1 {
+		log.Warn("invalid-number-of-args", log.Fields{"args": args})
+		err := errors.New("invalid-number-of-args")
+		return err, nil
+	}
+	pID := &ca.StrType{}
+	if err := ptypes.UnmarshalAny(args[0].Value, pID); err != nil {
+		log.Warnw("cannot-unmarshal-argument", log.Fields{"error": err})
+		return err, nil
+	}
+	log.Debugw("GetDevice", log.Fields{"deviceId": pID.Val})
+	// TODO process the request
+
+	if rhp.TestMode { // Execute only for test cases
+		return nil, &voltha.Device{Id: pID.Val}
+	}
+	return nil, nil
+}
+
+
+func (rhp *RequestHandlerProxy) GetChildDevice(args []*ca.Argument)(error, *voltha.Device) {
+	if len(args) < 1 {
+		log.Warn("invalid-number-of-args", log.Fields{"args": args})
+		err := errors.New("invalid-number-of-args")
+		return err, nil
+	}
+	pID := &ca.StrType{}
+	if err := ptypes.UnmarshalAny(args[0].Value, pID); err != nil {
+		log.Warnw("cannot-unmarshal-argument", log.Fields{"error": err})
+		return err, nil
+	}
+	// TODO decompose the other parameteres for matching criteria and process
+	log.Debugw("GetChildDevice", log.Fields{"deviceId": pID.Val})
+
+	if rhp.TestMode { // Execute only for test cases
+		return nil, &voltha.Device{Id: pID.Val}
+	}
+	return nil, nil
+}
+
+func (rhp *RequestHandlerProxy) GetPorts(args []*ca.Argument)(error, *voltha.Ports) {
+	if len(args) != 2 {
+		log.Warn("invalid-number-of-args", log.Fields{"args": args})
+		err := errors.New("invalid-number-of-args")
+		return err, nil
+	}
+	pID := &ca.StrType{}
+	if err := ptypes.UnmarshalAny(args[0].Value, pID); err != nil {
+		log.Warnw("cannot-unmarshal-argument", log.Fields{"error": err})
+		return err, nil
+	}
+	// Porttype is an enum sent as an integer proto
+	pt := &ca.IntType{}
+	if err := ptypes.UnmarshalAny(args[1].Value, pt); err != nil {
+		log.Warnw("cannot-unmarshal-argument", log.Fields{"error": err})
+		return err, nil
+	}
+
+	// TODO decompose the other parameteres for matching criteria
+	log.Debugw("GetPorts", log.Fields{"deviceID": pID.Val, "portype": pt.Val})
+
+	if rhp.TestMode { // Execute only for test cases
+		aPort := &voltha.Port{Label:"test_port"}
+		allPorts := &voltha.Ports{}
+		allPorts.Items = append(allPorts.Items, aPort)
+		return nil, allPorts
+	}
+	return nil, nil
+
+}
+
+func (rhp *RequestHandlerProxy) GetChildDevices(args []*ca.Argument)(error, *voltha.Device) {
+	if len(args) != 1 {
+		log.Warn("invalid-number-of-args", log.Fields{"args": args})
+		err := errors.New("invalid-number-of-args")
+		return err, nil
+	}
+	pID := &ca.StrType{}
+	if err := ptypes.UnmarshalAny(args[0].Value, pID); err != nil {
+		log.Warnw("cannot-unmarshal-argument", log.Fields{"error": err})
+		return err, nil
+	}
+	// TODO decompose the other parameteres for matching criteria and process
+	log.Debugw("GetChildDevice", log.Fields{"deviceId": pID.Val})
+
+	if rhp.TestMode { // Execute only for test cases
+		return nil, &voltha.Device{Id: pID.Val}
+	}
+	return nil, nil
+}
+
+// ChildDeviceDetected is invoked when a child device is detected.  The following
+// parameters are expected:
+// {parent_device_id, parent_port_no, child_device_type, proxy_address, admin_state, **kw)
+func (rhp *RequestHandlerProxy) ChildDeviceDetected(args []*ca.Argument) (error) {
+	if len(args) < 5 {
+		log.Warn("invalid-number-of-args", log.Fields{"args": args})
+		err := errors.New("invalid-number-of-args")
+		return err
+	}
+
+	pID := &ca.StrType{}
+	if err := ptypes.UnmarshalAny(args[0].Value, pID); err != nil {
+		log.Warnw("cannot-unmarshal-argument", log.Fields{"error": err})
+		return err
+	}
+	portNo := &ca.IntType{}
+	if err := ptypes.UnmarshalAny(args[1].Value, portNo); err != nil {
+		log.Warnw("cannot-unmarshal-argument", log.Fields{"error": err})
+		return err
+	}
+	dt := &ca.StrType{}
+	if err := ptypes.UnmarshalAny(args[2].Value, dt); err != nil {
+		log.Warnw("cannot-unmarshal-argument", log.Fields{"error": err})
+		return err
+	}
+	pAddr := &voltha.Device_ProxyAddress{}
+	if err := ptypes.UnmarshalAny(args[3].Value, pAddr); err != nil {
+		log.Warnw("cannot-unmarshal-argument", log.Fields{"error": err})
+		return err
+	}
+	adminState := &ca.IntType{}
+	if err := ptypes.UnmarshalAny(args[4].Value, adminState); err != nil {
+		log.Warnw("cannot-unmarshal-argument", log.Fields{"error": err})
+		return err
+	}
+
+	// Need to decode the other params - in this case the key will represent the proto type
+	// TODO decompose the other parameteres for matching criteria and process
+	log.Debugw("ChildDeviceDetected", log.Fields{"deviceId": pID.Val, "portNo":portNo.Val,
+	"deviceType": dt.Val, "proxyAddress": pAddr, "adminState": adminState})
+
+	if rhp.TestMode { // Execute only for test cases
+		return nil
+	}
+	return nil
+}
+
+
diff --git a/rw_core/main.go b/rw_core/main.go
index faa5851..a0928c5 100644
--- a/rw_core/main.go
+++ b/rw_core/main.go
@@ -6,6 +6,8 @@
 	"fmt"
 	"github.com/opencord/voltha-go/common/log"
 	"github.com/opencord/voltha-go/db/kvstore"
+	"github.com/opencord/voltha-go/kafka"
+	ca "github.com/opencord/voltha-go/protos/core_adapter"
 	"github.com/opencord/voltha-go/rw_core/config"
 	"os"
 	"os/signal"
@@ -19,6 +21,9 @@
 	config      *config.RWCoreFlags
 	halted      bool
 	exitChannel chan int
+	kmp         *kafka.KafkaMessagingProxy
+	//For test
+	receiverChannels []<-chan *ca.InterContainerMessage
 }
 
 func newKVClient(storeType string, address string, timeout int) (kvstore.Client, error) {
@@ -38,6 +43,7 @@
 	rwCore.config = cf
 	rwCore.halted = false
 	rwCore.exitChannel = make(chan int, 1)
+	rwCore.receiverChannels = make([]<-chan *ca.InterContainerMessage, 0)
 	return &rwCore
 }
 
@@ -63,6 +69,7 @@
 	}
 }
 
+
 func (core *rwCore) start(ctx context.Context) {
 	log.Info("Starting RW Core components")
 	// Setup GRPC Server
@@ -70,13 +77,29 @@
 	// Setup KV Client
 
 	// Setup Kafka messaging services
-
+	var err error
+	if core.kmp, err = kafka.NewKafkaMessagingProxy(
+		kafka.KafkaHost("10.100.198.220"),
+		kafka.KafkaPort(9092),
+		kafka.DefaultTopic(&kafka.Topic{Name: "Adapter"})); err != nil {
+		log.Errorw("fail-to-create-kafka-proxy", log.Fields{"error": err})
+		return
+	}
+	// Start the kafka messaging service - synchronous call to ensure
+	if err = core.kmp.Start(); err != nil {
+		log.Fatalw("error-starting-messaging-proxy", log.Fields{"error": err})
+	}
 }
 
 func (core *rwCore) stop() {
 	// Stop leadership tracking
 	core.halted = true
 
+	// Stop the Kafka messaging service
+	if core.kmp != nil {
+		core.kmp.Stop()
+	}
+
 	// send exit signal
 	core.exitChannel <- 0
 
diff --git a/tests/kafka/kafka_inter_container_messaging_test.go b/tests/kafka/kafka_inter_container_messaging_test.go
new file mode 100644
index 0000000..9a73b18
--- /dev/null
+++ b/tests/kafka/kafka_inter_container_messaging_test.go
@@ -0,0 +1,437 @@
+package kafka
+
+import (
+	"context"
+	"github.com/golang/protobuf/ptypes"
+	"github.com/opencord/voltha-go/common/log"
+	kk "github.com/opencord/voltha-go/kafka"
+	ca "github.com/opencord/voltha-go/protos/core_adapter"
+	"github.com/opencord/voltha-go/protos/voltha"
+	rhp "github.com/opencord/voltha-go/rw_core/core"
+	"github.com/stretchr/testify/assert"
+	"testing"
+	//"time"
+	"github.com/google/uuid"
+	"time"
+)
+
+var coreKafkaProxy *kk.KafkaMessagingProxy
+var adapterKafkaProxy *kk.KafkaMessagingProxy
+
+func init() {
+	if _, err := log.SetLogger(log.JSON, 1, log.Fields{"instanceId": "testing"}); err != nil {
+		log.With(log.Fields{"error": err}).Fatal("Cannot setup logging")
+	}
+	coreKafkaProxy, _ = kk.NewKafkaMessagingProxy(
+		kk.KafkaHost("10.100.198.220"),
+		kk.KafkaPort(9092),
+		kk.DefaultTopic(&kk.Topic{Name: "Core"}))
+
+	adapterKafkaProxy, _ = kk.NewKafkaMessagingProxy(
+		kk.KafkaHost("10.100.198.220"),
+		kk.KafkaPort(9092),
+		kk.DefaultTopic(&kk.Topic{Name: "Adapter"}))
+
+	coreKafkaProxy.Start()
+	adapterKafkaProxy.Start()
+	subscribeTarget(coreKafkaProxy)
+}
+
+func subscribeTarget(kmp *kk.KafkaMessagingProxy) {
+	topic := kk.Topic{Name: "Core"}
+	requestProxy := &rhp.RequestHandlerProxy{TestMode: true}
+	kmp.SubscribeWithTarget(topic, requestProxy)
+}
+
+func waitForRPCMessage(topic kk.Topic, ch <-chan *ca.InterContainerMessage, doneCh chan string) {
+	for msg := range ch {
+		log.Debugw("Got-RPC-message", log.Fields{"msg": msg})
+		//	Unpack message
+		requestBody := &ca.InterContainerRequestBody{}
+		if err := ptypes.UnmarshalAny(msg.Body, requestBody); err != nil {
+			doneCh <- "Error"
+		} else {
+			doneCh <- requestBody.Rpc
+		}
+		break
+	}
+}
+
+func TestSubscribeUnsubscribe(t *testing.T) {
+	// First subscribe to the specific topic
+	topic := kk.Topic{Name: "Core"}
+	ch, err := coreKafkaProxy.Subscribe(topic)
+	assert.NotNil(t, ch)
+	assert.Nil(t, err)
+	// Create a channel to receive a response
+	waitCh := make(chan string)
+	// Wait for a message
+	go waitForRPCMessage(topic, ch, waitCh)
+	// Send the message - don't care of the response
+	rpc := "AnyRPCRequestForTest"
+	adapterKafkaProxy.InvokeRPC(nil, rpc, &topic, true)
+	// Wait for the result on ouw own channel
+	result := <-waitCh
+	assert.Equal(t, result, rpc)
+	close(waitCh)
+	err = coreKafkaProxy.UnSubscribe(topic, ch)
+	assert.Nil(t, err)
+}
+
+func TestMultipleSubscribeUnsubscribe(t *testing.T) {
+	// First subscribe to the specific topic
+	var err error
+	var ch1 <-chan *ca.InterContainerMessage
+	var ch2 <-chan *ca.InterContainerMessage
+	topic := kk.Topic{Name: "Core"}
+	ch1, err = coreKafkaProxy.Subscribe(topic)
+	assert.NotNil(t, ch1)
+	assert.Nil(t, err)
+	// Create a channel to receive responses
+	waitCh := make(chan string)
+	ch2, err = coreKafkaProxy.Subscribe(topic)
+	assert.NotNil(t, ch2)
+	assert.Nil(t, err)
+	// Wait for a message
+	go waitForRPCMessage(topic, ch2, waitCh)
+	go waitForRPCMessage(topic, ch1, waitCh)
+
+	// Send the message - don't care of the response
+	rpc := "AnyRPCRequestForTest"
+	adapterKafkaProxy.InvokeRPC(nil, rpc, &topic, true)
+	// Wait for the result on ouw own channel
+
+	responses := 0
+	for msg := range waitCh {
+		assert.Equal(t, msg, rpc)
+		responses = responses + 1
+		if responses > 1 {
+			break
+		}
+	}
+	assert.Equal(t, responses, 2)
+	close(waitCh)
+	err = coreKafkaProxy.UnSubscribe(topic, ch1)
+	assert.Nil(t, err)
+	err = coreKafkaProxy.UnSubscribe(topic, ch2)
+	assert.Nil(t, err)
+}
+
+func TestIncorrectAPI(t *testing.T) {
+	trnsId := uuid.New().String()
+	protoMsg := &voltha.Device{Id: trnsId}
+	args := make([]*kk.KVArg, 1)
+	args[0] = &kk.KVArg{
+		Key:   "device",
+		Value: protoMsg,
+	}
+	rpc := "IncorrectAPI"
+	topic := kk.Topic{Name: "Core"}
+	start := time.Now()
+	status, result := adapterKafkaProxy.InvokeRPC(nil, rpc, &topic, true, args...)
+	elapsed := time.Since(start)
+	log.Infow("Result", log.Fields{"status": status, "result": result, "time": elapsed})
+	assert.Equal(t, status, false)
+	//Unpack the result into the actual proto object
+	unpackResult := &ca.Error{}
+	if err := ptypes.UnmarshalAny(result, unpackResult); err != nil {
+		log.Warnw("cannot-unmarshal-response", log.Fields{"error": err})
+	}
+	assert.NotNil(t, unpackResult)
+}
+
+func TestIncorrectAPIParams(t *testing.T) {
+	trnsId := uuid.New().String()
+	protoMsg := &voltha.Device{Id: trnsId}
+	args := make([]*kk.KVArg, 1)
+	args[0] = &kk.KVArg{
+		Key:   "device",
+		Value: protoMsg,
+	}
+	rpc := "GetDevice"
+	topic := kk.Topic{Name: "Core"}
+	start := time.Now()
+	status, result := adapterKafkaProxy.InvokeRPC(nil, rpc, &topic, true, args...)
+	elapsed := time.Since(start)
+	log.Infow("Result", log.Fields{"status": status, "result": result, "time": elapsed})
+	assert.Equal(t, status, false)
+	//Unpack the result into the actual proto object
+	unpackResult := &ca.Error{}
+	if err := ptypes.UnmarshalAny(result, unpackResult); err != nil {
+		log.Warnw("cannot-unmarshal-response", log.Fields{"error": err})
+	}
+	assert.NotNil(t, unpackResult)
+}
+
+func TestGetDevice(t *testing.T) {
+	trnsId := uuid.New().String()
+	protoMsg := &ca.StrType{Val: trnsId}
+	args := make([]*kk.KVArg, 1)
+	args[0] = &kk.KVArg{
+		Key:   "deviceID",
+		Value: protoMsg,
+	}
+	rpc := "GetDevice"
+	topic := kk.Topic{Name: "Core"}
+	expectedResponse := &voltha.Device{Id: trnsId}
+	timeout := time.Duration(50) * time.Millisecond
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	start := time.Now()
+	status, result := adapterKafkaProxy.InvokeRPC(ctx, rpc, &topic, true, args...)
+	elapsed := time.Since(start)
+	log.Infow("Result", log.Fields{"status": status, "result": result, "time": elapsed})
+	assert.Equal(t, status, true)
+	unpackResult := &voltha.Device{}
+	if err := ptypes.UnmarshalAny(result, unpackResult); err != nil {
+		log.Warnw("cannot-unmarshal-response", log.Fields{"error": err})
+	}
+	assert.Equal(t, unpackResult, expectedResponse)
+}
+
+func TestGetDeviceTimeout(t *testing.T) {
+	trnsId := uuid.New().String()
+	protoMsg := &ca.StrType{Val: trnsId}
+	args := make([]*kk.KVArg, 1)
+	args[0] = &kk.KVArg{
+		Key:   "deviceID",
+		Value: protoMsg,
+	}
+	rpc := "GetDevice"
+	topic := kk.Topic{Name: "Core"}
+	timeout := time.Duration(2) * time.Millisecond
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	start := time.Now()
+	status, result := adapterKafkaProxy.InvokeRPC(ctx, rpc, &topic, true, args...)
+	elapsed := time.Since(start)
+	log.Infow("Result", log.Fields{"status": status, "result": result, "time": elapsed})
+	assert.Equal(t, status, false)
+	unpackResult := &ca.Error{}
+	if err := ptypes.UnmarshalAny(result, unpackResult); err != nil {
+		log.Warnw("cannot-unmarshal-response", log.Fields{"error": err})
+	}
+	assert.NotNil(t, unpackResult)
+}
+
+func TestGetChildDevice(t *testing.T) {
+	trnsId := uuid.New().String()
+	protoMsg := &ca.StrType{Val: trnsId}
+	args := make([]*kk.KVArg, 1)
+	args[0] = &kk.KVArg{
+		Key:   "deviceID",
+		Value: protoMsg,
+	}
+	rpc := "GetChildDevice"
+	topic := kk.Topic{Name: "Core"}
+	expectedResponse := &voltha.Device{Id: trnsId}
+	start := time.Now()
+	status, result := adapterKafkaProxy.InvokeRPC(nil, rpc, &topic, true, args...)
+	elapsed := time.Since(start)
+	log.Infow("Result", log.Fields{"status": status, "result": result, "time": elapsed})
+	assert.Equal(t, status, true)
+	unpackResult := &voltha.Device{}
+	if err := ptypes.UnmarshalAny(result, unpackResult); err != nil {
+		log.Warnw("cannot-unmarshal-response", log.Fields{"error": err})
+	}
+	assert.Equal(t, unpackResult, expectedResponse)
+}
+
+func TestGetChildDevices(t *testing.T) {
+	trnsId := uuid.New().String()
+	protoMsg := &ca.StrType{Val: trnsId}
+	args := make([]*kk.KVArg, 1)
+	args[0] = &kk.KVArg{
+		Key:   "deviceID",
+		Value: protoMsg,
+	}
+	rpc := "GetChildDevices"
+	topic := kk.Topic{Name: "Core"}
+	expectedResponse := &voltha.Device{Id: trnsId}
+	start := time.Now()
+	status, result := adapterKafkaProxy.InvokeRPC(nil, rpc, &topic, true, args...)
+	elapsed := time.Since(start)
+	log.Infow("Result", log.Fields{"status": status, "result": result, "time": elapsed})
+	assert.Equal(t, status, true)
+	unpackResult := &voltha.Device{}
+	if err := ptypes.UnmarshalAny(result, unpackResult); err != nil {
+		log.Warnw("cannot-unmarshal-response", log.Fields{"error": err})
+	}
+	assert.Equal(t, unpackResult, expectedResponse)
+}
+
+func TestGetPorts(t *testing.T) {
+	trnsId := uuid.New().String()
+	protoArg1 := &ca.StrType{Val: trnsId}
+	args := make([]*kk.KVArg, 2)
+	args[0] = &kk.KVArg{
+		Key:   "deviceID",
+		Value: protoArg1,
+	}
+	protoArg2 := &ca.IntType{Val: 1}
+	args[1] = &kk.KVArg{
+		Key:   "portType",
+		Value: protoArg2,
+	}
+	rpc := "GetPorts"
+	topic := kk.Topic{Name: "Core"}
+	start := time.Now()
+	status, result := adapterKafkaProxy.InvokeRPC(nil, rpc, &topic, true, args...)
+	elapsed := time.Since(start)
+	log.Infow("Result", log.Fields{"status": status, "result": result, "time": elapsed})
+	assert.Equal(t, status, true)
+	unpackResult := &voltha.Ports{}
+	if err := ptypes.UnmarshalAny(result, unpackResult); err != nil {
+		log.Warnw("cannot-unmarshal-response", log.Fields{"error": err})
+	}
+	expectedLen := len(unpackResult.Items) >= 1
+	assert.Equal(t, true, expectedLen)
+}
+
+func TestGetPortsMissingArgs(t *testing.T) {
+	trnsId := uuid.New().String()
+	protoArg1 := &ca.StrType{Val: trnsId}
+	args := make([]*kk.KVArg, 1)
+	args[0] = &kk.KVArg{
+		Key:   "deviceID",
+		Value: protoArg1,
+	}
+	rpc := "GetPorts"
+	topic := kk.Topic{Name: "Core"}
+	start := time.Now()
+	status, result := adapterKafkaProxy.InvokeRPC(nil, rpc, &topic, true, args...)
+	elapsed := time.Since(start)
+	log.Infow("Result", log.Fields{"status": status, "result": result, "time": elapsed})
+	assert.Equal(t, status, false)
+	//Unpack the result into the actual proto object
+	unpackResult := &ca.Error{}
+	if err := ptypes.UnmarshalAny(result, unpackResult); err != nil {
+		log.Warnw("cannot-unmarshal-response", log.Fields{"error": err})
+	}
+	assert.NotNil(t, unpackResult)
+}
+
+func TestChildDeviceDetected(t *testing.T) {
+	trnsId := uuid.New().String()
+	protoArg1 := &ca.StrType{Val: trnsId}
+	args := make([]*kk.KVArg, 5)
+	args[0] = &kk.KVArg{
+		Key:   "deviceID",
+		Value: protoArg1,
+	}
+	protoArg2 := &ca.IntType{Val: 1}
+	args[1] = &kk.KVArg{
+		Key:   "parentPortNo",
+		Value: protoArg2,
+	}
+	protoArg3 := &ca.StrType{Val: "great_onu"}
+	args[2] = &kk.KVArg{
+		Key:   "childDeviceType",
+		Value: protoArg3,
+	}
+	protoArg4 := &voltha.Device_ProxyAddress{DeviceId: trnsId, ChannelId: 100}
+	args[3] = &kk.KVArg{
+		Key:   "proxyAddress",
+		Value: protoArg4,
+	}
+	protoArg5 := &ca.IntType{Val: 1}
+	args[4] = &kk.KVArg{
+		Key:   "portType",
+		Value: protoArg5,
+	}
+
+	rpc := "ChildDeviceDetected"
+	topic := kk.Topic{Name: "Core"}
+	start := time.Now()
+	status, result := adapterKafkaProxy.InvokeRPC(nil, rpc, &topic, true, args...)
+	elapsed := time.Since(start)
+	log.Infow("Result", log.Fields{"status": status, "result": result, "time": elapsed})
+	assert.Equal(t, status, true)
+	assert.Nil(t, result)
+}
+
+func TestChildDeviceDetectedNoWait(t *testing.T) {
+	trnsId := uuid.New().String()
+	protoArg1 := &ca.StrType{Val: trnsId}
+	args := make([]*kk.KVArg, 5)
+	args[0] = &kk.KVArg{
+		Key:   "deviceID",
+		Value: protoArg1,
+	}
+	protoArg2 := &ca.IntType{Val: 1}
+	args[1] = &kk.KVArg{
+		Key:   "parentPortNo",
+		Value: protoArg2,
+	}
+	protoArg3 := &ca.StrType{Val: "great_onu"}
+	args[2] = &kk.KVArg{
+		Key:   "childDeviceType",
+		Value: protoArg3,
+	}
+	protoArg4 := &voltha.Device_ProxyAddress{DeviceId: trnsId, ChannelId: 100}
+	args[3] = &kk.KVArg{
+		Key:   "proxyAddress",
+		Value: protoArg4,
+	}
+	protoArg5 := &ca.IntType{Val: 1}
+	args[4] = &kk.KVArg{
+		Key:   "portType",
+		Value: protoArg5,
+	}
+
+	rpc := "ChildDeviceDetected"
+	topic := kk.Topic{Name: "Core"}
+	start := time.Now()
+	status, result := adapterKafkaProxy.InvokeRPC(nil, rpc, &topic, false, args...)
+	elapsed := time.Since(start)
+	log.Infow("Result", log.Fields{"status": status, "result": result, "time": elapsed})
+	assert.Equal(t, status, true)
+	assert.Nil(t, result)
+}
+
+func TestChildDeviceDetectedMissingArgs(t *testing.T) {
+	trnsId := uuid.New().String()
+	protoArg1 := &ca.StrType{Val: trnsId}
+	args := make([]*kk.KVArg, 4)
+	args[0] = &kk.KVArg{
+		Key:   "deviceID",
+		Value: protoArg1,
+	}
+	protoArg2 := &ca.IntType{Val: 1}
+	args[1] = &kk.KVArg{
+		Key:   "parentPortNo",
+		Value: protoArg2,
+	}
+	protoArg3 := &ca.StrType{Val: "great_onu"}
+	args[2] = &kk.KVArg{
+		Key:   "childDeviceType",
+		Value: protoArg3,
+	}
+	protoArg4 := &voltha.Device_ProxyAddress{DeviceId: trnsId, ChannelId: 100}
+	args[3] = &kk.KVArg{
+		Key:   "proxyAddress",
+		Value: protoArg4,
+	}
+
+	rpc := "ChildDeviceDetected"
+	topic := kk.Topic{Name: "Core"}
+	start := time.Now()
+	status, result := adapterKafkaProxy.InvokeRPC(nil, rpc, &topic, true, args...)
+	elapsed := time.Since(start)
+	log.Infow("Result", log.Fields{"status": status, "result": result, "time": elapsed})
+	assert.Equal(t, status, false)
+	unpackResult := &ca.Error{}
+	if err := ptypes.UnmarshalAny(result, unpackResult); err != nil {
+		log.Warnw("cannot-unmarshal-response", log.Fields{"error": err})
+	}
+	assert.NotNil(t, unpackResult)
+}
+
+func TestStopKafkaProxy(t *testing.T) {
+	adapterKafkaProxy.Stop()
+	coreKafkaProxy.Stop()
+}
+
+//func TestMain(m *testing.T) {
+//	log.Info("Main")
+//}