diff --git a/adaptercoreont/openonu.go b/adaptercoreont/openonu.go
new file mode 100644
index 0000000..c8b7d4d
--- /dev/null
+++ b/adaptercoreont/openonu.go
@@ -0,0 +1,295 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.
+ */
+
+//Package adaptercoreont provides the utility for onu devices, flows and statistics
+package adaptercoreont
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/opencord/voltha-lib-go/v3/pkg/adapters/adapterif"
+	"github.com/opencord/voltha-lib-go/v3/pkg/kafka"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	ic "github.com/opencord/voltha-protos/v3/go/inter_container"
+	"github.com/opencord/voltha-protos/v3/go/openflow_13"
+	"github.com/opencord/voltha-protos/v3/go/voltha"
+
+	"test.internal/openadapter/config"
+)
+
+//OpenONUAC structure holds the ONU core information
+type OpenONUAC struct {
+	deviceHandlers              map[string]*DeviceHandler
+	coreProxy                   adapterif.CoreProxy
+	adapterProxy                adapterif.AdapterProxy
+	eventProxy                  adapterif.EventProxy
+	kafkaICProxy                kafka.InterContainerProxy
+	config                      *config.AdapterFlags
+	numOnus                     int
+	KVStoreHost                 string
+	KVStorePort                 int
+	KVStoreType                 string
+	exitChannel                 chan int
+	HeartbeatCheckInterval      time.Duration
+	HeartbeatFailReportInterval time.Duration
+	//GrpcTimeoutInterval         time.Duration
+	lockDeviceHandlersMap sync.RWMutex
+}
+
+//NewOpenONUAC returns a new instance of OpenONU_AC
+func NewOpenONUAC(ctx context.Context, kafkaICProxy kafka.InterContainerProxy,
+	coreProxy adapterif.CoreProxy, adapterProxy adapterif.AdapterProxy,
+	eventProxy adapterif.EventProxy, cfg *config.AdapterFlags) *OpenONUAC {
+	var openOnuAc OpenONUAC
+	openOnuAc.exitChannel = make(chan int, 1)
+	openOnuAc.deviceHandlers = make(map[string]*DeviceHandler)
+	openOnuAc.kafkaICProxy = kafkaICProxy
+	openOnuAc.config = cfg
+	openOnuAc.numOnus = cfg.OnuNumber
+	openOnuAc.coreProxy = coreProxy
+	openOnuAc.adapterProxy = adapterProxy
+	openOnuAc.eventProxy = eventProxy
+	openOnuAc.KVStoreHost = cfg.KVStoreHost
+	openOnuAc.KVStorePort = cfg.KVStorePort
+	openOnuAc.KVStoreType = cfg.KVStoreType
+	openOnuAc.HeartbeatCheckInterval = cfg.HeartbeatCheckInterval
+	openOnuAc.HeartbeatFailReportInterval = cfg.HeartbeatFailReportInterval
+	//openOnuAc.GrpcTimeoutInterval = cfg.GrpcTimeoutInterval
+	openOnuAc.lockDeviceHandlersMap = sync.RWMutex{}
+	return &openOnuAc
+}
+
+//Start starts (logs) the adapter
+func (oo *OpenONUAC) Start(ctx context.Context) error {
+	log.Info("starting-openonu-adapter")
+	log.Info("openonu-adapter-started")
+	return nil
+}
+
+//Stop terminates the session
+func (oo *OpenONUAC) Stop(ctx context.Context) error {
+	log.Info("stopping-device-manager")
+	oo.exitChannel <- 1
+	log.Info("device-manager-stopped")
+	return nil
+}
+
+func (oo *OpenONUAC) addDeviceHandlerToMap(ctx context.Context, agent *DeviceHandler) {
+	oo.lockDeviceHandlersMap.Lock()
+	defer oo.lockDeviceHandlersMap.Unlock()
+	if _, exist := oo.deviceHandlers[agent.deviceID]; !exist {
+		oo.deviceHandlers[agent.deviceID] = agent
+		oo.deviceHandlers[agent.deviceID].Start(ctx)
+	}
+}
+
+func (oo *OpenONUAC) deleteDeviceHandlerToMap(agent *DeviceHandler) {
+	oo.lockDeviceHandlersMap.Lock()
+	defer oo.lockDeviceHandlersMap.Unlock()
+	delete(oo.deviceHandlers, agent.deviceID)
+}
+
+func (oo *OpenONUAC) getDeviceHandler(deviceID string) *DeviceHandler {
+	oo.lockDeviceHandlersMap.Lock()
+	defer oo.lockDeviceHandlersMap.Unlock()
+	if agent, ok := oo.deviceHandlers[deviceID]; ok {
+		return agent
+	}
+	return nil
+}
+
+// Adapter interface required methods ############## begin #########
+// #################################################################
+
+// for original content compare: (needs according deviceHandler methods)
+// /voltha-openolt-adapter/adaptercore/openolt.go
+
+// Adopt_device creates a new device handler if not present already and then adopts the device
+func (oo *OpenONUAC) Adopt_device(device *voltha.Device) error {
+	if device == nil {
+		log.Warn("voltha-device-is-nil")
+		return errors.New("nil-device")
+	}
+	ctx := context.Background()
+	log.Infow("adopt-device", log.Fields{"deviceId": device.Id})
+	var handler *DeviceHandler
+	if handler = oo.getDeviceHandler(device.Id); handler == nil {
+		handler := NewDeviceHandler(oo.coreProxy, oo.adapterProxy, oo.eventProxy, device, oo)
+		oo.addDeviceHandlerToMap(ctx, handler)
+		go handler.AdoptDevice(ctx, device)
+		// Launch the creation of the device topic
+		// go oo.createDeviceTopic(device)
+	}
+	return nil
+}
+
+//Get_ofp_device_info returns OFP information for the given device
+func (oo *OpenONUAC) Get_ofp_device_info(device *voltha.Device) (*ic.SwitchCapability, error) {
+	log.Errorw("device-handler-not-set", log.Fields{"deviceId": device.Id})
+	return nil, errors.New("device-handler-not-set")
+}
+
+//Get_ofp_port_info returns OFP port information for the given device
+func (oo *OpenONUAC) Get_ofp_port_info(device *voltha.Device, portNo int64) (*ic.PortCapability, error) {
+	log.Errorw("device-handler-not-set", log.Fields{"deviceId": device.Id})
+	return nil, errors.New("device-handler-not-set")
+}
+
+//Process_inter_adapter_message sends messages to a target device (between adapters)
+func (oo *OpenONUAC) Process_inter_adapter_message(msg *ic.InterAdapterMessage) error {
+	log.Debugw("Process_inter_adapter_message", log.Fields{"msgId": msg.Header.Id,
+		"msgProxyDeviceId": msg.Header.ProxyDeviceId, "msgToDeviceId": msg.Header.ToDeviceId})
+
+	targetDevice := msg.Header.ToDeviceId
+	//ToDeviceId should address an DeviceHandler instance
+	if handler := oo.getDeviceHandler(targetDevice); handler != nil {
+		return handler.ProcessInterAdapterMessage(msg)
+	}
+	log.Warn("no handler found for received Inter-Proxy-message 'ToDeviceId'")
+	return fmt.Errorf(fmt.Sprintf("handler-not-found-%s", targetDevice))
+}
+
+//Adapter_descriptor not implemented
+func (oo *OpenONUAC) Adapter_descriptor() error {
+	return errors.New("unImplemented")
+}
+
+//Device_types unimplemented
+func (oo *OpenONUAC) Device_types() (*voltha.DeviceTypes, error) {
+	return nil, errors.New("unImplemented")
+}
+
+//Health  returns unimplemented
+func (oo *OpenONUAC) Health() (*voltha.HealthStatus, error) {
+	return nil, errors.New("unImplemented")
+}
+
+//Reconcile_device unimplemented
+func (oo *OpenONUAC) Reconcile_device(device *voltha.Device) error {
+	return errors.New("unImplemented")
+}
+
+//Abandon_device unimplemented
+func (oo *OpenONUAC) Abandon_device(device *voltha.Device) error {
+	return errors.New("unImplemented")
+}
+
+//Disable_device disables the given device
+func (oo *OpenONUAC) Disable_device(device *voltha.Device) error {
+	return errors.New("unImplemented")
+}
+
+//Reenable_device enables the olt device after disable
+func (oo *OpenONUAC) Reenable_device(device *voltha.Device) error {
+	return errors.New("unImplemented")
+}
+
+//Reboot_device reboots the given device
+func (oo *OpenONUAC) Reboot_device(device *voltha.Device) error {
+	return errors.New("unImplemented")
+}
+
+//Self_test_device unimplented
+func (oo *OpenONUAC) Self_test_device(device *voltha.Device) error {
+	return errors.New("unImplemented")
+}
+
+//Delete_device unimplemented
+func (oo *OpenONUAC) Delete_device(device *voltha.Device) error {
+	return errors.New("unImplemented")
+}
+
+//Get_device_details unimplemented
+func (oo *OpenONUAC) Get_device_details(device *voltha.Device) error {
+	return errors.New("unImplemented")
+}
+
+//Update_flows_bulk returns
+func (oo *OpenONUAC) Update_flows_bulk(device *voltha.Device, flows *voltha.Flows, groups *voltha.FlowGroups, flowMetadata *voltha.FlowMetadata) error {
+	return errors.New("unImplemented")
+}
+
+//Update_flows_incrementally updates (add/remove) the flows on a given device
+func (oo *OpenONUAC) Update_flows_incrementally(device *voltha.Device, flows *openflow_13.FlowChanges, groups *openflow_13.FlowGroupChanges, flowMetadata *voltha.FlowMetadata) error {
+	return errors.New("unImplemented")
+}
+
+//Update_pm_config returns PmConfigs nil or error
+func (oo *OpenONUAC) Update_pm_config(device *voltha.Device, pmConfigs *voltha.PmConfigs) error {
+	return errors.New("unImplemented")
+}
+
+//Receive_packet_out sends packet out to the device
+func (oo *OpenONUAC) Receive_packet_out(deviceID string, egressPortNo int, packet *openflow_13.OfpPacketOut) error {
+	return errors.New("unImplemented")
+}
+
+//Suppress_event unimplemented
+func (oo *OpenONUAC) Suppress_event(filter *voltha.EventFilter) error {
+	return errors.New("unImplemented")
+}
+
+//Unsuppress_event  unimplemented
+func (oo *OpenONUAC) Unsuppress_event(filter *voltha.EventFilter) error {
+	return errors.New("unImplemented")
+}
+
+//Download_image unimplemented
+func (oo *OpenONUAC) Download_image(device *voltha.Device, request *voltha.ImageDownload) (*voltha.ImageDownload, error) {
+	return nil, errors.New("unImplemented")
+}
+
+//Get_image_download_status unimplemented
+func (oo *OpenONUAC) Get_image_download_status(device *voltha.Device, request *voltha.ImageDownload) (*voltha.ImageDownload, error) {
+	return nil, errors.New("unImplemented")
+}
+
+//Cancel_image_download unimplemented
+func (oo *OpenONUAC) Cancel_image_download(device *voltha.Device, request *voltha.ImageDownload) (*voltha.ImageDownload, error) {
+	return nil, errors.New("unImplemented")
+}
+
+//Activate_image_update unimplemented
+func (oo *OpenONUAC) Activate_image_update(device *voltha.Device, request *voltha.ImageDownload) (*voltha.ImageDownload, error) {
+	return nil, errors.New("unImplemented")
+}
+
+//Revert_image_update unimplemented
+func (oo *OpenONUAC) Revert_image_update(device *voltha.Device, request *voltha.ImageDownload) (*voltha.ImageDownload, error) {
+	return nil, errors.New("unImplemented")
+}
+
+// Enable_port to Enable PON/NNI interface
+func (oo *OpenONUAC) Enable_port(deviceID string, port *voltha.Port) error {
+	return errors.New("unImplemented")
+}
+
+// Disable_port to Disable pon/nni interface
+func (oo *OpenONUAC) Disable_port(deviceID string, port *voltha.Port) error {
+	return errors.New("unImplemented")
+}
+
+// enableDisablePort to Disable pon or Enable PON interface
+func (oo *OpenONUAC) enableDisablePort(deviceID string, port *voltha.Port, enablePort bool) error {
+	return errors.New("unImplemented")
+}
+
+// Adapter interface required methods ################ end #########
+// #################################################################