diff --git a/internal/pkg/onuadaptercore/device_handler.go b/internal/pkg/onuadaptercore/device_handler.go
new file mode 100644
index 0000000..9d00d5a
--- /dev/null
+++ b/internal/pkg/onuadaptercore/device_handler.go
@@ -0,0 +1,1865 @@
+/*
+ * 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 adaptercoreonu provides the utility for onu devices, flows and statistics
+package adaptercoreonu
+
+import (
+	"context"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/gogo/protobuf/proto"
+	"github.com/golang/protobuf/ptypes"
+	"github.com/looplab/fsm"
+	me "github.com/opencord/omci-lib-go/generated"
+	"github.com/opencord/voltha-lib-go/v3/pkg/adapters/adapterif"
+	"github.com/opencord/voltha-lib-go/v3/pkg/db"
+	flow "github.com/opencord/voltha-lib-go/v3/pkg/flows"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	vc "github.com/opencord/voltha-protos/v3/go/common"
+	ic "github.com/opencord/voltha-protos/v3/go/inter_container"
+	"github.com/opencord/voltha-protos/v3/go/openflow_13"
+	of "github.com/opencord/voltha-protos/v3/go/openflow_13"
+	ofp "github.com/opencord/voltha-protos/v3/go/openflow_13"
+	oop "github.com/opencord/voltha-protos/v3/go/openolt"
+	"github.com/opencord/voltha-protos/v3/go/voltha"
+)
+
+/*
+// Constants for number of retries and for timeout
+const (
+	MaxRetry       = 10
+	MaxTimeOutInMs = 500
+)
+*/
+
+const (
+	devEvDeviceInit       = "devEvDeviceInit"
+	devEvGrpcConnected    = "devEvGrpcConnected"
+	devEvGrpcDisconnected = "devEvGrpcDisconnected"
+	devEvDeviceUpInd      = "devEvDeviceUpInd"
+	devEvDeviceDownInd    = "devEvDeviceDownInd"
+)
+const (
+	devStNull      = "devStNull"
+	devStDown      = "devStDown"
+	devStInit      = "devStInit"
+	devStConnected = "devStConnected"
+	devStUp        = "devStUp"
+)
+
+//Event category and subcategory definitions - same as defiend for OLT in eventmgr.go  - should be done more centrally
+const (
+	pon = voltha.EventSubCategory_PON
+	equipment = voltha.EventCategory_EQUIPMENT
+)
+
+const (
+	cEventObjectType = "ONU"
+)
+const (
+	cOnuActivatedEvent = "ONU_ACTIVATED"
+)
+
+//deviceHandler will interact with the ONU ? device.
+type deviceHandler struct {
+	deviceID         string
+	DeviceType       string
+	adminState       string
+	device           *voltha.Device
+	logicalDeviceID  string
+	ProxyAddressID   string
+	ProxyAddressType string
+	parentID         string
+	ponPortNumber    uint32
+
+	coreProxy    adapterif.CoreProxy
+	AdapterProxy adapterif.AdapterProxy
+	EventProxy   adapterif.EventProxy
+
+	pOpenOnuAc      *OpenONUAC
+	pDeviceStateFsm *fsm.FSM
+	deviceEntrySet  chan bool //channel for DeviceEntry set event
+	pOnuOmciDevice  *OnuDeviceEntry
+	pOnuTP          *onuUniTechProf
+	exitChannel     chan int
+	lockDevice      sync.RWMutex
+	pOnuIndication  *oop.OnuIndication
+	deviceReason    string
+	pLockStateFsm   *lockStateFsm
+	pUnlockStateFsm *lockStateFsm
+
+
+	stopCollector       chan bool
+	stopHeartbeatCheck  chan bool
+	activePorts         sync.Map
+	uniEntityMap        map[uint32]*onuUniPort
+	UniVlanConfigFsmMap map[uint8]*UniVlanConfigFsm
+	reconciling         bool
+}
+
+//newDeviceHandler creates a new device handler
+func newDeviceHandler(cp adapterif.CoreProxy, ap adapterif.AdapterProxy, ep adapterif.EventProxy, device *voltha.Device, adapter *OpenONUAC) *deviceHandler {
+	var dh deviceHandler
+	dh.coreProxy = cp
+	dh.AdapterProxy = ap
+	dh.EventProxy = ep
+	cloned := (proto.Clone(device)).(*voltha.Device)
+	dh.deviceID = cloned.Id
+	dh.DeviceType = cloned.Type
+	dh.adminState = "up"
+	dh.device = cloned
+	dh.pOpenOnuAc = adapter
+	dh.exitChannel = make(chan int, 1)
+	dh.lockDevice = sync.RWMutex{}
+	dh.deviceEntrySet = make(chan bool, 1)
+	dh.stopCollector = make(chan bool, 2)
+	dh.stopHeartbeatCheck = make(chan bool, 2)
+	dh.activePorts = sync.Map{}
+	dh.uniEntityMap = make(map[uint32]*onuUniPort)
+	dh.UniVlanConfigFsmMap = make(map[uint8]*UniVlanConfigFsm)
+	dh.reconciling = false
+
+	dh.pDeviceStateFsm = fsm.NewFSM(
+		devStNull,
+		fsm.Events{
+			{Name: devEvDeviceInit, Src: []string{devStNull, devStDown}, Dst: devStInit},
+			{Name: devEvGrpcConnected, Src: []string{devStInit}, Dst: devStConnected},
+			{Name: devEvGrpcDisconnected, Src: []string{devStConnected, devStDown}, Dst: devStInit},
+			{Name: devEvDeviceUpInd, Src: []string{devStConnected, devStDown}, Dst: devStUp},
+			{Name: devEvDeviceDownInd, Src: []string{devStUp}, Dst: devStDown},
+		},
+		fsm.Callbacks{
+			"before_event":                      func(e *fsm.Event) { dh.logStateChange(e) },
+			("before_" + devEvDeviceInit):       func(e *fsm.Event) { dh.doStateInit(e) },
+			("after_" + devEvDeviceInit):        func(e *fsm.Event) { dh.postInit(e) },
+			("before_" + devEvGrpcConnected):    func(e *fsm.Event) { dh.doStateConnected(e) },
+			("before_" + devEvGrpcDisconnected): func(e *fsm.Event) { dh.doStateInit(e) },
+			("after_" + devEvGrpcDisconnected):  func(e *fsm.Event) { dh.postInit(e) },
+			("before_" + devEvDeviceUpInd):      func(e *fsm.Event) { dh.doStateUp(e) },
+			("before_" + devEvDeviceDownInd):    func(e *fsm.Event) { dh.doStateDown(e) },
+		},
+	)
+
+	return &dh
+}
+
+// start save the device to the data model
+func (dh *deviceHandler) start(ctx context.Context) {
+	logger.Debugw("starting-device-handler", log.Fields{"device": dh.device, "device-id": dh.deviceID})
+	logger.Debug("device-handler-started")
+}
+
+/*
+// stop stops the device dh.  Not much to do for now
+func (dh *deviceHandler) stop(ctx context.Context) {
+	logger.Debug("stopping-device-handler")
+	dh.exitChannel <- 1
+}
+*/
+
+// ##########################################################################################
+// deviceHandler methods that implement the adapters interface requests ##### begin #########
+
+//adoptOrReconcileDevice adopts the OLT device
+func (dh *deviceHandler) adoptOrReconcileDevice(ctx context.Context, device *voltha.Device) {
+	logger.Debugw("Adopt_or_reconcile_device", log.Fields{"device-id": device.Id, "Address": device.GetHostAndPort()})
+
+	logger.Debugw("Device FSM: ", log.Fields{"state": string(dh.pDeviceStateFsm.Current())})
+	if dh.pDeviceStateFsm.Is(devStNull) {
+		if err := dh.pDeviceStateFsm.Event(devEvDeviceInit); err != nil {
+			logger.Errorw("Device FSM: Can't go to state DeviceInit", log.Fields{"err": err})
+		}
+		logger.Debugw("Device FSM: ", log.Fields{"state": string(dh.pDeviceStateFsm.Current())})
+	} else {
+		logger.Debugw("AdoptOrReconcileDevice: Agent/device init already done", log.Fields{"device-id": device.Id})
+	}
+
+}
+
+func (dh *deviceHandler) processInterAdapterOMCIReqMessage(msg *ic.InterAdapterMessage) error {
+	msgBody := msg.GetBody()
+	omciMsg := &ic.InterAdapterOmciMessage{}
+	if err := ptypes.UnmarshalAny(msgBody, omciMsg); err != nil {
+		logger.Warnw("cannot-unmarshal-omci-msg-body", log.Fields{
+			"device-id": dh.deviceID, "error": err})
+		return err
+	}
+
+	logger.Debugw("inter-adapter-recv-omci", log.Fields{
+		"device-id": dh.deviceID, "RxOmciMessage": hex.EncodeToString(omciMsg.Message)})
+	pDevEntry := dh.getOnuDeviceEntry(true)
+	if pDevEntry != nil {
+		return pDevEntry.PDevOmciCC.receiveMessage(context.TODO(), omciMsg.Message)
+	}
+	logger.Errorw("No valid OnuDevice -aborting", log.Fields{"device-id": dh.deviceID})
+	return errors.New("no valid OnuDevice")
+}
+
+func (dh *deviceHandler) processInterAdapterONUIndReqMessage(msg *ic.InterAdapterMessage) error {
+	msgBody := msg.GetBody()
+	onuIndication := &oop.OnuIndication{}
+	if err := ptypes.UnmarshalAny(msgBody, onuIndication); err != nil {
+		logger.Warnw("cannot-unmarshal-onu-indication-msg-body", log.Fields{
+			"device-id": dh.deviceID, "error": err})
+		return err
+	}
+
+	onuOperstate := onuIndication.GetOperState()
+	logger.Debugw("inter-adapter-recv-onu-ind", log.Fields{"OnuId": onuIndication.GetOnuId(),
+		"AdminState": onuIndication.GetAdminState(), "OperState": onuOperstate,
+		"SNR": onuIndication.GetSerialNumber()})
+
+	if onuOperstate == "up" {
+		_ = dh.createInterface(onuIndication)
+	} else if (onuOperstate == "down") || (onuOperstate == "unreachable") {
+		_ = dh.updateInterface(onuIndication)
+	} else {
+		logger.Errorw("unknown-onu-indication operState", log.Fields{"OnuId": onuIndication.GetOnuId()})
+		return errors.New("invalidOperState")
+	}
+	return nil
+}
+
+func (dh *deviceHandler) processInterAdapterTechProfileDownloadReqMessage(
+	msg *ic.InterAdapterMessage) error {
+	if dh.pOnuTP == nil {
+		//should normally not happen ...
+		logger.Warnw("onuTechProf instance not set up for DLMsg request - ignoring request",
+			log.Fields{"device-id": dh.deviceID})
+		return errors.New("techProfile DLMsg request while onuTechProf instance not setup")
+	}
+	if (dh.deviceReason == "stopping-openomci") || (dh.deviceReason == "omci-admin-lock") {
+		// I've seen cases for this request, where the device was already stopped
+		logger.Warnw("TechProf stopped: device-unreachable", log.Fields{"device-id": dh.deviceID})
+		return errors.New("device-unreachable")
+	}
+
+	msgBody := msg.GetBody()
+	techProfMsg := &ic.InterAdapterTechProfileDownloadMessage{}
+	if err := ptypes.UnmarshalAny(msgBody, techProfMsg); err != nil {
+		logger.Warnw("cannot-unmarshal-techprof-msg-body", log.Fields{
+			"device-id": dh.deviceID, "error": err})
+		return err
+	}
+
+	dh.pOnuTP.lockTpProcMutex()
+	if bTpModify := dh.pOnuTP.updateOnuUniTpPath(techProfMsg.UniId, techProfMsg.Path); bTpModify {
+		//	if there has been some change for some uni TechProfilePath
+		//in order to allow concurrent calls to other dh instances we do not wait for execution here
+		//but doing so we can not indicate problems to the caller (who does what with that then?)
+		//by now we just assume straightforward successful execution
+		//TODO!!! Generally: In this scheme it would be good to have some means to indicate
+		//  possible problems to the caller later autonomously
+
+		// deadline context to ensure completion of background routines waited for
+		//20200721: 10s proved to be less in 8*8 ONU test on local vbox machine with debug, might be further adapted
+		deadline := time.Now().Add(30 * time.Second) //allowed run time to finish before execution
+		dctx, cancel := context.WithDeadline(context.Background(), deadline)
+
+		dh.pOnuTP.resetProcessingErrorIndication()
+		var wg sync.WaitGroup
+		wg.Add(2) // for the 2 go routines to finish
+		// attention: deadline completion check and wg.Done is to be done in both routines
+		go dh.pOnuTP.configureUniTp(dctx, uint8(techProfMsg.UniId), techProfMsg.Path, &wg)
+		go dh.pOnuTP.updateOnuTpPathKvStore(dctx, &wg)
+		//the wait.. function is responsible for tpProcMutex.Unlock()
+		err := dh.pOnuTP.waitForTpCompletion(cancel, &wg) //wait for background process to finish and collect their result
+		return err
+	}
+	dh.pOnuTP.unlockTpProcMutex()
+	return nil
+}
+
+func (dh *deviceHandler) processInterAdapterDeleteGemPortReqMessage(
+	msg *ic.InterAdapterMessage) error {
+
+	if dh.pOnuTP == nil {
+		//should normally not happen ...
+		logger.Warnw("onuTechProf instance not set up for DelGem request - ignoring request",
+			log.Fields{"device-id": dh.deviceID})
+		return errors.New("techProfile DelGem request while onuTechProf instance not setup")
+	}
+
+	msgBody := msg.GetBody()
+	delGemPortMsg := &ic.InterAdapterDeleteGemPortMessage{}
+	if err := ptypes.UnmarshalAny(msgBody, delGemPortMsg); err != nil {
+		logger.Warnw("cannot-unmarshal-delete-gem-msg-body", log.Fields{
+			"device-id": dh.deviceID, "error": err})
+		return err
+	}
+
+	dh.pOnuTP.lockTpProcMutex()
+
+	deadline := time.Now().Add(10 * time.Second) //allowed run time to finish before execution
+	dctx, cancel := context.WithDeadline(context.Background(), deadline)
+
+	dh.pOnuTP.resetProcessingErrorIndication()
+	var wg sync.WaitGroup
+	wg.Add(1) // for the 1 go routine to finish
+	go dh.pOnuTP.deleteTpResource(dctx, delGemPortMsg.UniId, delGemPortMsg.TpPath,
+		cResourceGemPort, delGemPortMsg.GemPortId, &wg)
+	err := dh.pOnuTP.waitForTpCompletion(cancel, &wg) //let that also run off-line to let the IA messaging return!
+	return err
+}
+
+func (dh *deviceHandler) processInterAdapterDeleteTcontReqMessage(
+	msg *ic.InterAdapterMessage) error {
+	if dh.pOnuTP == nil {
+		//should normally not happen ...
+		logger.Warnw("onuTechProf instance not set up for DelTcont request - ignoring request",
+			log.Fields{"device-id": dh.deviceID})
+		return errors.New("techProfile DelTcont request while onuTechProf instance not setup")
+	}
+
+	msgBody := msg.GetBody()
+	delTcontMsg := &ic.InterAdapterDeleteTcontMessage{}
+	if err := ptypes.UnmarshalAny(msgBody, delTcontMsg); err != nil {
+		logger.Warnw("cannot-unmarshal-delete-tcont-msg-body", log.Fields{
+			"device-id": dh.deviceID, "error": err})
+		return err
+	}
+
+	dh.pOnuTP.lockTpProcMutex()
+	if bTpModify := dh.pOnuTP.updateOnuUniTpPath(delTcontMsg.UniId, ""); bTpModify {
+		// deadline context to ensure completion of background routines waited for
+		deadline := time.Now().Add(10 * time.Second) //allowed run time to finish before execution
+		dctx, cancel := context.WithDeadline(context.Background(), deadline)
+
+		dh.pOnuTP.resetProcessingErrorIndication()
+		var wg sync.WaitGroup
+		wg.Add(2) // for the 2 go routines to finish
+		go dh.pOnuTP.deleteTpResource(dctx, delTcontMsg.UniId, delTcontMsg.TpPath,
+			cResourceTcont, delTcontMsg.AllocId, &wg)
+		// Removal of the tcont/alloc id mapping represents the removal of the tech profile
+		go dh.pOnuTP.updateOnuTpPathKvStore(dctx, &wg)
+		//the wait.. function is responsible for tpProcMutex.Unlock()
+		err := dh.pOnuTP.waitForTpCompletion(cancel, &wg) //let that also run off-line to let the IA messaging return!
+		return err
+	}
+	dh.pOnuTP.unlockTpProcMutex()
+	return nil
+}
+
+//processInterAdapterMessage sends the proxied messages to the target device
+// If the proxy address is not found in the unmarshalled message, it first fetches the onu device for which the message
+// is meant, and then send the unmarshalled omci message to this onu
+func (dh *deviceHandler) processInterAdapterMessage(msg *ic.InterAdapterMessage) error {
+	msgID := msg.Header.Id
+	msgType := msg.Header.Type
+	fromTopic := msg.Header.FromTopic
+	toTopic := msg.Header.ToTopic
+	toDeviceID := msg.Header.ToDeviceId
+	proxyDeviceID := msg.Header.ProxyDeviceId
+	logger.Debugw("InterAdapter message header", log.Fields{"msgID": msgID, "msgType": msgType,
+		"fromTopic": fromTopic, "toTopic": toTopic, "toDeviceID": toDeviceID, "proxyDeviceID": proxyDeviceID})
+
+	switch msgType {
+	case ic.InterAdapterMessageType_OMCI_REQUEST:
+		{
+			return dh.processInterAdapterOMCIReqMessage(msg)
+		}
+	case ic.InterAdapterMessageType_ONU_IND_REQUEST:
+		{
+			return dh.processInterAdapterONUIndReqMessage(msg)
+		}
+	case ic.InterAdapterMessageType_TECH_PROFILE_DOWNLOAD_REQUEST:
+		{
+			return dh.processInterAdapterTechProfileDownloadReqMessage(msg)
+		}
+	case ic.InterAdapterMessageType_DELETE_GEM_PORT_REQUEST:
+		{
+			return dh.processInterAdapterDeleteGemPortReqMessage(msg)
+
+		}
+	case ic.InterAdapterMessageType_DELETE_TCONT_REQUEST:
+		{
+			return dh.processInterAdapterDeleteTcontReqMessage(msg)
+		}
+	default:
+		{
+			logger.Errorw("inter-adapter-unhandled-type", log.Fields{
+				"device-id": dh.deviceID, "msgType": msg.Header.Type})
+			return errors.New("unimplemented")
+		}
+	}
+}
+
+//FlowUpdateIncremental removes and/or adds the flow changes on a given device
+func (dh *deviceHandler) FlowUpdateIncremental(apOfFlowChanges *openflow_13.FlowChanges,
+	apOfGroupChanges *openflow_13.FlowGroupChanges, apFlowMetaData *voltha.FlowMetadata) error {
+
+	if apOfFlowChanges.ToRemove != nil {
+		for _, flowItem := range apOfFlowChanges.ToRemove.Items {
+			logger.Debugw("incremental flow item remove", log.Fields{"deviceId": dh.deviceID,
+				"Item": flowItem})
+		}
+	}
+	if apOfFlowChanges.ToAdd != nil {
+		for _, flowItem := range apOfFlowChanges.ToAdd.Items {
+			if flowItem.GetCookie() == 0 {
+				logger.Debugw("incremental flow add - no cookie - ignore", log.Fields{
+					"deviceId": dh.deviceID})
+				continue
+			}
+			flowInPort := flow.GetInPort(flowItem)
+			if flowInPort == uint32(of.OfpPortNo_OFPP_INVALID) {
+				logger.Errorw("flow inPort invalid", log.Fields{"deviceID": dh.deviceID})
+				return errors.New("flow inPort invalid")
+			} else if flowInPort == dh.ponPortNumber {
+				//this is some downstream flow
+				logger.Debugw("incremental flow ignore downstream", log.Fields{
+					"deviceId": dh.deviceID, "inPort": flowInPort})
+				continue
+			} else {
+				// this is the relevant upstream flow
+				var loUniPort *onuUniPort
+				if uniPort, exist := dh.uniEntityMap[flowInPort]; exist {
+					loUniPort = uniPort
+				} else {
+					logger.Errorw("flow inPort not found in UniPorts",
+						log.Fields{"deviceID": dh.deviceID, "inPort": flowInPort})
+					return fmt.Errorf("flow-parameter inPort %d not found in internal UniPorts", flowInPort)
+				}
+				flowOutPort := flow.GetOutPort(flowItem)
+				logger.Debugw("incremental flow-add port indications", log.Fields{
+					"deviceId": dh.deviceID, "inPort": flowInPort, "outPort": flowOutPort,
+					"uniPortName": loUniPort.name})
+				err := dh.addFlowItemToUniPort(flowItem, loUniPort)
+				//abort processing in error case
+				if err != nil {
+					return err
+				}
+			}
+		}
+	}
+	return nil
+}
+
+//disableDevice locks the ONU and its UNI/VEIP ports (admin lock via OMCI)
+// TODO!!! Clarify usage of this method, it is for sure not used within ONOS (OLT) device disable
+//         maybe it is obsolete by now
+func (dh *deviceHandler) disableDevice(device *voltha.Device) {
+	logger.Debugw("disable-device", log.Fields{"device-id": device.Id, "SerialNumber": device.SerialNumber})
+
+	if dh.deviceReason != "omci-admin-lock" {
+		// disable UNI ports/ONU
+		// *** should generate UniAdminStateDone event - unrelated to DeviceProcStatusUpdate!!
+		//     here the result of the processing is not checked (trusted in background) *****
+		if dh.pLockStateFsm == nil {
+			dh.createUniLockFsm(true, UniAdminStateDone)
+		} else { //LockStateFSM already init
+			dh.pLockStateFsm.setSuccessEvent(UniAdminStateDone)
+			dh.runUniLockFsm(true)
+		}
+
+		if err := dh.coreProxy.DeviceReasonUpdate(context.TODO(), dh.deviceID, "omci-admin-lock"); err != nil {
+			//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+			logger.Errorw("error-updating-reason-state", log.Fields{"device-id": dh.deviceID, "error": err})
+		}
+		dh.deviceReason = "omci-admin-lock"
+		//200604: ConnState improved to 'unreachable' (was not set in python-code), OperState 'unknown' seems to be best choice
+		if err := dh.coreProxy.DeviceStateUpdate(context.TODO(), dh.deviceID, voltha.ConnectStatus_UNREACHABLE,
+			voltha.OperStatus_UNKNOWN); err != nil {
+			//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+			logger.Errorw("error-updating-device-state", log.Fields{"device-id": dh.deviceID, "error": err})
+		}
+
+		// update json file
+		// onustat := &OnuStatus{
+		// 	Id:           dh.deviceID,
+		// 	AdminState:   vc.AdminState_Types_name[int32(dh.device.AdminState)],
+		// 	OpeState:     vc.OperStatus_Types_name[int32(dh.device.OperStatus)],
+		// 	ConnectState: vc.ConnectStatus_Types_name[int32(dh.device.ConnectStatus)],
+		// 	MacAddress:   dh.device.MacAddress,
+		// }
+		// logger.Debugw("UpdateOnu", log.Fields{"Id": dh.deviceID})
+		// err := UpdateOnu(onustat)
+		// logger.Debugw("UpdateOnu", log.Fields{"err": err})
+	}
+}
+
+//reEnableDevice unlocks the ONU and its UNI/VEIP ports (admin unlock via OMCI)
+// TODO!!! Clarify usage of this method, compare above DisableDevice, usage may clarify resulting states
+//         maybe it is obsolete by now
+func (dh *deviceHandler) reEnableDevice(device *voltha.Device) {
+	logger.Debugw("reenable-device", log.Fields{"device-id": device.Id, "SerialNumber": device.SerialNumber})
+
+	if err := dh.coreProxy.DeviceStateUpdate(context.TODO(), dh.deviceID, voltha.ConnectStatus_REACHABLE,
+		voltha.OperStatus_ACTIVE); err != nil {
+		//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+		logger.Errorw("error-updating-device-state", log.Fields{"device-id": dh.deviceID, "error": err})
+	}
+
+	if err := dh.coreProxy.DeviceReasonUpdate(context.TODO(), dh.deviceID, "initial-mib-downloaded"); err != nil {
+		//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+		logger.Errorw("error-updating-reason-state", log.Fields{"device-id": dh.deviceID, "error": err})
+	}
+	dh.deviceReason = "initial-mib-downloaded"
+
+
+	if dh.pUnlockStateFsm == nil {
+		dh.createUniLockFsm(false, UniAdminStateDone)
+	} else { //UnlockStateFSM already init
+		dh.pUnlockStateFsm.setSuccessEvent(UniAdminStateDone)
+		dh.runUniLockFsm(false)
+	}
+}
+
+func (dh *deviceHandler) reconcileDeviceOnuInd() {
+	logger.Debugw("reconciling - simulate onu indication", log.Fields{"device-id": dh.deviceID})
+
+	if err := dh.pOnuTP.restoreFromOnuTpPathKvStore(context.TODO()); err != nil {
+		logger.Errorw("reconciling - restoring OnuTp-data failed - abort", log.Fields{"err": err, "device-id": dh.deviceID})
+		dh.reconciling = false
+		return
+	}
+	var onuIndication oop.OnuIndication
+	onuIndication.IntfId = dh.pOnuTP.sOnuPersistentData.PersIntfID
+	onuIndication.OnuId = dh.pOnuTP.sOnuPersistentData.PersOnuID
+	onuIndication.OperState = dh.pOnuTP.sOnuPersistentData.PersOperState
+	onuIndication.AdminState = dh.pOnuTP.sOnuPersistentData.PersAdminState
+	_ = dh.createInterface(&onuIndication)
+}
+
+func (dh *deviceHandler) reconcileDeviceTechProf() {
+	logger.Debugw("reconciling - trigger tech profile config", log.Fields{"device-id": dh.deviceID})
+
+	dh.pOnuTP.lockTpProcMutex()
+	for _, uniData := range dh.pOnuTP.sOnuPersistentData.PersUniTpPath {
+		//In order to allow concurrent calls to other dh instances we do not wait for execution here
+		//but doing so we can not indicate problems to the caller (who does what with that then?)
+		//by now we just assume straightforward successful execution
+		//TODO!!! Generally: In this scheme it would be good to have some means to indicate
+		//  possible problems to the caller later autonomously
+
+		// deadline context to ensure completion of background routines waited for
+		//20200721: 10s proved to be less in 8*8 ONU test on local vbox machine with debug, might be further adapted
+		deadline := time.Now().Add(30 * time.Second) //allowed run time to finish before execution
+		dctx, cancel := context.WithDeadline(context.Background(), deadline)
+
+		dh.pOnuTP.resetProcessingErrorIndication()
+		var wg sync.WaitGroup
+		wg.Add(1) // for the 1 go routines to finish
+		// attention: deadline completion check and wg.Done is to be done in both routines
+		go dh.pOnuTP.configureUniTp(dctx, uint8(uniData.PersUniID), uniData.PersTpPath, &wg)
+		//the wait.. function is responsible for tpProcMutex.Unlock()
+		_ = dh.pOnuTP.waitForTpCompletion(cancel, &wg) //wait for background process to finish and collect their result
+		return
+	}
+	dh.pOnuTP.unlockTpProcMutex()
+	dh.reconciling = false
+}
+
+func (dh *deviceHandler) deleteDevice(device *voltha.Device) error {
+	logger.Debugw("delete-device", log.Fields{"device-id": device.Id, "SerialNumber": device.SerialNumber})
+	if err := dh.pOnuTP.deleteOnuTpPathKvStore(context.TODO()); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (dh *deviceHandler) rebootDevice(device *voltha.Device) error {
+	logger.Debugw("reboot-device", log.Fields{"device-id": device.Id, "SerialNumber": device.SerialNumber})
+	if device.ConnectStatus != voltha.ConnectStatus_REACHABLE {
+		logger.Errorw("device-unreachable", log.Fields{"device-id": device.Id, "SerialNumber": device.SerialNumber})
+		return errors.New("device-unreachable")
+	}
+	if err := dh.coreProxy.DeviceStateUpdate(context.TODO(), dh.deviceID, voltha.ConnectStatus_UNREACHABLE,
+		voltha.OperStatus_DISCOVERED); err != nil {
+		//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+		logger.Errorw("error-updating-device-state", log.Fields{"device-id": dh.deviceID, "error": err})
+		return err
+	}
+	if err := dh.coreProxy.DeviceReasonUpdate(context.TODO(), dh.deviceID, "rebooting-onu"); err != nil {
+		//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+		logger.Errorw("error-updating-reason-state", log.Fields{"device-id": dh.deviceID, "error": err})
+		return err
+	}
+	dh.deviceReason = "rebooting-onu"
+
+	if err := dh.sendMsgToOlt(context.TODO(), "reboot", nil); err != nil {
+		logger.Debugw("error", log.Fields{"error": err})
+	}
+
+	return nil
+}
+
+//  deviceHandler methods that implement the adapters interface requests## end #########
+// #####################################################################################
+
+// ################  to be updated acc. needs of ONU Device ########################
+// deviceHandler StateMachine related state transition methods ##### begin #########
+
+func (dh *deviceHandler) logStateChange(e *fsm.Event) {
+	logger.Debugw("Device FSM: ", log.Fields{"event name": string(e.Event), "src state": string(e.Src), "dst state": string(e.Dst), "device-id": dh.deviceID})
+}
+
+// doStateInit provides the device update to the core
+func (dh *deviceHandler) doStateInit(e *fsm.Event) {
+
+	logger.Debug("doStateInit-started")
+	var err error
+
+	dh.device.Root = false
+	dh.device.Vendor = "OpenONU"
+	dh.device.Model = "go"
+	dh.device.Reason = "activating-onu"
+	dh.deviceReason = "activating-onu"
+
+	dh.logicalDeviceID = dh.deviceID // really needed - what for ??? //TODO!!!
+
+	if !dh.reconciling {
+		_ = dh.coreProxy.DeviceUpdate(context.TODO(), dh.device)
+	} else {
+		logger.Debugw("reconciling - don't notify core about DeviceUpdate",
+			log.Fields{"device-id": dh.deviceID})
+	}
+
+	dh.parentID = dh.device.ParentId
+	dh.ponPortNumber = dh.device.ParentPortNo
+
+	dh.ProxyAddressID = dh.device.ProxyAddress.GetDeviceId()
+	dh.ProxyAddressType = dh.device.ProxyAddress.GetDeviceType()
+	logger.Debugw("device-updated", log.Fields{"device-id": dh.deviceID, "proxyAddressID": dh.ProxyAddressID,
+		"proxyAddressType": dh.ProxyAddressType, "SNR": dh.device.SerialNumber,
+		"ParentId": dh.parentID, "ParentPortNo": dh.ponPortNumber})
+
+	/*
+		self._pon = PonPort.create(self, self._pon_port_number)
+		self._pon.add_peer(self.parent_id, self._pon_port_number)
+		self.logger.debug('adding-pon-port-to-agent',
+				   type=self._pon.get_port().type,
+				   admin_state=self._pon.get_port().admin_state,
+				   oper_status=self._pon.get_port().oper_status,
+				   )
+	*/
+	if !dh.reconciling {
+		logger.Debugw("adding-pon-port", log.Fields{"deviceID": dh.deviceID, "ponPortNo": dh.ponPortNumber})
+		var ponPortNo uint32 = 1
+		if dh.ponPortNumber != 0 {
+			ponPortNo = dh.ponPortNumber
+		}
+
+		pPonPort := &voltha.Port{
+			PortNo: ponPortNo,
+			//Label:      fmt.Sprintf("pon-%d", ponPortNo),
+			Label:      "PON port",
+			Type:       voltha.Port_PON_ONU,
+			OperStatus: voltha.OperStatus_ACTIVE,
+			Peers: []*voltha.Port_PeerPort{{DeviceId: dh.parentID, // Peer device  is OLT
+				PortNo: ponPortNo}}, // Peer port is parent's port number
+		}
+		if err = dh.coreProxy.PortCreated(context.TODO(), dh.deviceID, pPonPort); err != nil {
+			logger.Fatalf("Device FSM: PortCreated-failed-%s", err)
+			e.Cancel(err)
+			return
+		}
+	} else {
+		logger.Debugw("reconciling - pon-port already added", log.Fields{"device-id": dh.deviceID})
+	}
+	logger.Debug("doStateInit-done")
+}
+
+// postInit setups the DeviceEntry for the conerned device
+func (dh *deviceHandler) postInit(e *fsm.Event) {
+
+	logger.Debug("postInit-started")
+	var err error
+	/*
+		dh.Client = oop.NewOpenoltClient(dh.clientCon)
+		dh.pTransitionMap.Handle(ctx, GrpcConnected)
+		return nil
+	*/
+	if err = dh.addOnuDeviceEntry(context.TODO()); err != nil {
+		logger.Fatalf("Device FSM: addOnuDeviceEntry-failed-%s", err)
+		e.Cancel(err)
+		return
+	}
+
+	if dh.reconciling {
+		go dh.reconcileDeviceOnuInd()
+		// reconcilement will be continued after mib download is done
+	}
+	/*
+			############################################################################
+			# Setup Alarm handler
+			self.events = AdapterEvents(self.core_proxy, device.id, self.logical_device_id,
+										device.serial_number)
+			############################################################################
+			# Setup PM configuration for this device
+			# Pass in ONU specific options
+			kwargs = {
+				OnuPmMetrics.DEFAULT_FREQUENCY_KEY: OnuPmMetrics.DEFAULT_ONU_COLLECTION_FREQUENCY,
+				'heartbeat': self.heartbeat,
+				OnuOmciPmMetrics.OMCI_DEV_KEY: self._onu_omci_device
+			}
+			self.logger.debug('create-pm-metrics', device_id=device.id, serial_number=device.serial_number)
+			self._pm_metrics = OnuPmMetrics(self.events, self.core_proxy, self.device_id,
+										   self.logical_device_id, device.serial_number,
+										   grouped=True, freq_override=False, **kwargs)
+			pm_config = self._pm_metrics.make_proto()
+			self._onu_omci_device.set_pm_config(self._pm_metrics.omci_pm.openomci_interval_pm)
+			self.logger.info("initial-pm-config", device_id=device.id, serial_number=device.serial_number)
+			yield self.core_proxy.device_pm_config_update(pm_config, init=True)
+
+			# Note, ONU ID and UNI intf set in add_uni_port method
+			self._onu_omci_device.alarm_synchronizer.set_alarm_params(mgr=self.events,
+																	  ani_ports=[self._pon])
+
+			# Code to Run OMCI Test Action
+			kwargs_omci_test_action = {
+				OmciTestRequest.DEFAULT_FREQUENCY_KEY:
+					OmciTestRequest.DEFAULT_COLLECTION_FREQUENCY
+			}
+			serial_number = device.serial_number
+			self._test_request = OmciTestRequest(self.core_proxy,
+										   self.omci_agent, self.device_id,
+										   AniG, serial_number,
+										   self.logical_device_id,
+										   exclusive=False,
+										   **kwargs_omci_test_action)
+
+			self.enabled = True
+		else:
+			self.logger.info('onu-already-activated')
+	*/
+	logger.Debug("postInit-done")
+}
+
+// doStateConnected get the device info and update to voltha core
+// for comparison of the original method (not that easy to uncomment): compare here:
+//  voltha-openolt-adapter/adaptercore/device_handler.go
+//  -> this one obviously initiates all communication interfaces of the device ...?
+func (dh *deviceHandler) doStateConnected(e *fsm.Event) {
+
+	logger.Debug("doStateConnected-started")
+	err := errors.New("device FSM: function not implemented yet")
+	e.Cancel(err)
+	logger.Debug("doStateConnected-done")
+}
+
+// doStateUp handle the onu up indication and update to voltha core
+func (dh *deviceHandler) doStateUp(e *fsm.Event) {
+
+	logger.Debug("doStateUp-started")
+	err := errors.New("device FSM: function not implemented yet")
+	e.Cancel(err)
+	logger.Debug("doStateUp-done")
+
+	/*
+		// Synchronous call to update device state - this method is run in its own go routine
+		if err := dh.coreProxy.DeviceStateUpdate(ctx, dh.device.Id, voltha.ConnectStatus_REACHABLE,
+			voltha.OperStatus_ACTIVE); err != nil {
+			logger.Errorw("Failed to update device with OLT UP indication", log.Fields{"deviceID": dh.device.Id, "error": err})
+			return err
+		}
+		return nil
+	*/
+}
+
+// doStateDown handle the onu down indication
+func (dh *deviceHandler) doStateDown(e *fsm.Event) {
+
+	logger.Debug("doStateDown-started")
+	var err error
+
+	device := dh.device
+	if device == nil {
+		/*TODO: needs to handle error scenarios */
+		logger.Error("Failed to fetch handler device")
+		e.Cancel(err)
+		return
+	}
+
+	cloned := proto.Clone(device).(*voltha.Device)
+	logger.Debugw("do-state-down", log.Fields{"ClonedDeviceID": cloned.Id})
+	/*
+		// Update the all ports state on that device to disable
+		if er := dh.coreProxy.PortsStateUpdate(ctx, cloned.Id, voltha.OperStatus_UNKNOWN); er != nil {
+			logger.Errorw("updating-ports-failed", log.Fields{"deviceID": device.Id, "error": er})
+			return er
+		}
+
+		//Update the device oper state and connection status
+		cloned.OperStatus = voltha.OperStatus_UNKNOWN
+		cloned.ConnectStatus = common.ConnectStatus_UNREACHABLE
+		dh.device = cloned
+
+		if er := dh.coreProxy.DeviceStateUpdate(ctx, cloned.Id, cloned.ConnectStatus, cloned.OperStatus); er != nil {
+			logger.Errorw("error-updating-device-state", log.Fields{"deviceID": device.Id, "error": er})
+			return er
+		}
+
+		//get the child device for the parent device
+		onuDevices, err := dh.coreProxy.GetChildDevices(ctx, dh.device.Id)
+		if err != nil {
+			logger.Errorw("failed to get child devices information", log.Fields{"deviceID": dh.device.Id, "error": err})
+			return err
+		}
+		for _, onuDevice := range onuDevices.Items {
+
+			// Update onu state as down in onu adapter
+			onuInd := oop.OnuIndication{}
+			onuInd.OperState = "down"
+			er := dh.AdapterProxy.SendInterAdapterMessage(ctx, &onuInd, ic.InterAdapterMessageType_ONU_IND_REQUEST,
+				"openolt", onuDevice.Type, onuDevice.Id, onuDevice.ProxyAddress.DeviceId, "")
+			if er != nil {
+				logger.Errorw("Failed to send inter-adapter-message", log.Fields{"OnuInd": onuInd,
+					"From Adapter": "openolt", "DevieType": onuDevice.Type, "DeviceID": onuDevice.Id})
+				//Do not return here and continue to process other ONUs
+			}
+		}
+		// * Discovered ONUs entries need to be cleared , since after OLT
+		//   is up, it starts sending discovery indications again* /
+		dh.discOnus = sync.Map{}
+		logger.Debugw("do-state-down-end", log.Fields{"deviceID": device.Id})
+		return nil
+	*/
+	err = errors.New("device FSM: function not implemented yet")
+	e.Cancel(err)
+	logger.Debug("doStateDown-done")
+}
+
+// deviceHandler StateMachine related state transition methods ##### end #########
+// #################################################################################
+
+// ###################################################
+// deviceHandler utility methods ##### begin #########
+
+//getOnuDeviceEntry getsthe  ONU device entry and may wait until its value is defined
+func (dh *deviceHandler) getOnuDeviceEntry(aWait bool) *OnuDeviceEntry {
+	dh.lockDevice.RLock()
+	pOnuDeviceEntry := dh.pOnuOmciDevice
+	if aWait && pOnuDeviceEntry == nil {
+		//keep the read sema short to allow for subsequent write
+		dh.lockDevice.RUnlock()
+		logger.Debugw("Waiting for DeviceEntry to be set ...", log.Fields{"device-id": dh.deviceID})
+		// based on concurrent processing the deviceEntry setup may not yet be finished at his point
+		// so it might be needed to wait here for that event with some timeout
+		select {
+		case <-time.After(60 * time.Second): //timer may be discussed ...
+			logger.Errorw("No valid DeviceEntry set after maxTime", log.Fields{"device-id": dh.deviceID})
+			return nil
+		case <-dh.deviceEntrySet:
+			logger.Debugw("devicEntry ready now - continue", log.Fields{"device-id": dh.deviceID})
+			// if written now, we can return the written value without sema
+			return dh.pOnuOmciDevice
+		}
+	}
+	dh.lockDevice.RUnlock()
+	return pOnuDeviceEntry
+}
+
+//setOnuDeviceEntry sets the ONU device entry within the handler
+func (dh *deviceHandler) setOnuDeviceEntry(
+	apDeviceEntry *OnuDeviceEntry, apOnuTp *onuUniTechProf) {
+	dh.lockDevice.Lock()
+	defer dh.lockDevice.Unlock()
+	dh.pOnuOmciDevice = apDeviceEntry
+	dh.pOnuTP = apOnuTp
+}
+
+//addOnuDeviceEntry creates a new ONU device or returns the existing
+func (dh *deviceHandler) addOnuDeviceEntry(ctx context.Context) error {
+	logger.Debugw("adding-deviceEntry", log.Fields{"device-id": dh.deviceID})
+
+	deviceEntry := dh.getOnuDeviceEntry(false)
+	if deviceEntry == nil {
+		/* costum_me_map in python code seems always to be None,
+		   we omit that here first (declaration unclear) -> todo at Adapter specialization ...*/
+		/* also no 'clock' argument - usage open ...*/
+		/* and no alarm_db yet (oo.alarm_db)  */
+		deviceEntry = newOnuDeviceEntry(ctx, dh.deviceID, dh.pOpenOnuAc.KVStoreHost,
+			dh.pOpenOnuAc.KVStorePort, dh.pOpenOnuAc.KVStoreType,
+			dh, dh.coreProxy, dh.AdapterProxy,
+			dh.pOpenOnuAc.pSupportedFsms) //nil as FSM pointer would yield deviceEntry internal defaults ...
+		onuTechProfProc := newOnuUniTechProf(ctx, dh.deviceID, dh)
+		//error treatment possible //TODO!!!
+		dh.setOnuDeviceEntry(deviceEntry, onuTechProfProc)
+		// fire deviceEntry ready event to spread to possibly waiting processing
+		dh.deviceEntrySet <- true
+
+		//dh.sendMsgToOlt(ctx, "adopt", nil)
+		// // update json file
+		// onustat := &OnuStatus{
+		// 	Id:           dh.deviceID,
+		// 	AdminState:   vc.AdminState_Types_name[int32(dh.device.AdminState)],
+		// 	OpeState:     vc.OperStatus_Types_name[int32(dh.device.OperStatus)],
+		// 	ConnectState: vc.ConnectStatus_Types_name[int32(dh.device.ConnectStatus)],
+		// 	MacAddress:   dh.device.MacAddress,
+		// }
+		// logger.Debugw("AddOnu", log.Fields{"Id": onustat.Id, "Admin": onustat.AdminState, "Ope": onustat.OpeState, "Con": onustat.ConnectState, "Mac": onustat.MacAddress})
+		// err := AddOnu(onustat)
+		// logger.Debugw("AddOnu", log.Fields{"err": err})
+		// //
+		// go WatchStatus(ctx, dh.coreProxy)
+
+		// dh.device.Root = true
+		// dh.coreProxy.DeviceUpdate(context.TODO(), dh.device)
+
+		logger.Infow("onuDeviceEntry-added", log.Fields{"device-id": dh.deviceID})
+	} else {
+		logger.Infow("onuDeviceEntry-add: Device already exists", log.Fields{"device-id": dh.deviceID})
+	}
+	return nil
+}
+
+// doStateInit provides the device update to the core
+func (dh *deviceHandler) createInterface(onuind *oop.OnuIndication) error {
+	logger.Debugw("create_interface-started", log.Fields{"OnuId": onuind.GetOnuId(),
+		"OnuIntfId": onuind.GetIntfId(), "OnuSerialNumber": onuind.GetSerialNumber()})
+
+	dh.pOnuIndication = onuind // let's revise if storing the pointer is sufficient...
+
+	if !dh.reconciling {
+		if err := dh.coreProxy.DeviceStateUpdate(context.TODO(), dh.deviceID,
+			voltha.ConnectStatus_REACHABLE, voltha.OperStatus_ACTIVATING); err != nil {
+			//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+			logger.Errorw("error-updating-device-state", log.Fields{"device-id": dh.deviceID, "error": err})
+		}
+	} else {
+		logger.Debugw("reconciling - don't notify core about DeviceStateUpdate to ACTIVATING",
+			log.Fields{"device-id": dh.deviceID})
+	}
+	/*
+			device, err := dh.coreProxy.GetDevice(context.TODO(), dh.device.Id, dh.device.Id)
+		    if err != nil || device == nil {
+					//TODO: needs to handle error scenarios
+				logger.Errorw("Failed to fetch device device at creating If", log.Fields{"err": err})
+				return errors.New("Voltha Device not found")
+			}
+	*/
+
+	pDevEntry := dh.getOnuDeviceEntry(true)
+	if pDevEntry != nil {
+		if err := pDevEntry.start(context.TODO()); err != nil {
+			return err
+		}
+	} else {
+		logger.Errorw("No valid OnuDevice -aborting", log.Fields{"device-id": dh.deviceID})
+		return errors.New("no valid OnuDevice")
+	}
+	if !dh.reconciling {
+		if err := dh.coreProxy.DeviceReasonUpdate(context.TODO(), dh.deviceID, "starting-openomci"); err != nil {
+			//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+			logger.Errorw("error-DeviceReasonUpdate to starting-openomci", log.Fields{"device-id": dh.deviceID, "error": err})
+		}
+	} else {
+		logger.Debugw("reconciling - don't notify core about DeviceReasonUpdate to starting-openomci",
+			log.Fields{"device-id": dh.deviceID})
+	}
+	dh.deviceReason = "starting-openomci"
+
+	/* this might be a good time for Omci Verify message?  */
+	verifyExec := make(chan bool)
+	omciVerify := newOmciTestRequest(context.TODO(),
+		dh.device.Id, pDevEntry.PDevOmciCC,
+		true, true) //eclusive and allowFailure (anyway not yet checked)
+	omciVerify.performOmciTest(context.TODO(), verifyExec)
+
+	/* 	give the handler some time here to wait for the OMCi verification result
+	after Timeout start and try MibUpload FSM anyway
+	(to prevent stopping on just not supported OMCI verification from ONU) */
+	select {
+	case <-time.After(2 * time.Second):
+		logger.Warn("omci start-verification timed out (continue normal)")
+	case testresult := <-verifyExec:
+		logger.Infow("Omci start verification done", log.Fields{"result": testresult})
+	}
+
+	/* In py code it looks earlier (on activate ..)
+			# Code to Run OMCI Test Action
+			kwargs_omci_test_action = {
+				OmciTestRequest.DEFAULT_FREQUENCY_KEY:
+					OmciTestRequest.DEFAULT_COLLECTION_FREQUENCY
+			}
+			serial_number = device.serial_number
+			self._test_request = OmciTestRequest(self.core_proxy,
+											self.omci_agent, self.device_id,
+											AniG, serial_number,
+											self.logical_device_id,
+											exclusive=False,
+											**kwargs_omci_test_action)
+	...
+	                    # Start test requests after a brief pause
+	                    if not self._test_request_started:
+	                        self._test_request_started = True
+	                        tststart = _STARTUP_RETRY_WAIT * (random.randint(1, 5))
+	                        reactor.callLater(tststart, self._test_request.start_collector)
+
+	*/
+	/* which is then: in omci_test_request.py : */
+	/*
+	   def start_collector(self, callback=None):
+	       """
+	               Start the collection loop for an adapter if the frequency > 0
+
+	               :param callback: (callable) Function to call to collect PM data
+	       """
+	       self.logger.info("starting-pm-collection", device_name=self.name, default_freq=self.default_freq)
+	       if callback is None:
+	           callback = self.perform_test_omci
+
+	       if self.lc is None:
+	           self.lc = LoopingCall(callback)
+
+	       if self.default_freq > 0:
+	           self.lc.start(interval=self.default_freq / 10)
+
+	   def perform_test_omci(self):
+	       """
+	       Perform the initial test request
+	       """
+	       ani_g_entities = self._device.configuration.ani_g_entities
+	       ani_g_entities_ids = list(ani_g_entities.keys()) if ani_g_entities \
+	                                                     is not None else None
+	       self._entity_id = ani_g_entities_ids[0]
+	       self.logger.info('perform-test', entity_class=self._entity_class,
+	                     entity_id=self._entity_id)
+	       try:
+	           frame = MEFrame(self._entity_class, self._entity_id, []).test()
+	           result = yield self._device.omci_cc.send(frame)
+	           if not result.fields['omci_message'].fields['success_code']:
+	               self.logger.info('Self-Test Submitted Successfully',
+	                             code=result.fields[
+	                                 'omci_message'].fields['success_code'])
+	           else:
+	               raise TestFailure('Test Failure: {}'.format(
+	                   result.fields['omci_message'].fields['success_code']))
+	       except TimeoutError as e:
+	           self.deferred.errback(failure.Failure(e))
+
+	       except Exception as e:
+	           self.logger.exception('perform-test-Error', e=e,
+	                              class_id=self._entity_class,
+	                              entity_id=self._entity_id)
+	           self.deferred.errback(failure.Failure(e))
+
+	*/
+
+
+	/* Note: Even though FSM calls look 'synchronous' here, FSM is running in background with the effect that possible errors
+	 * 	 within the MibUpload are not notified in the OnuIndication response, this might be acceptable here,
+	 *   as further OltAdapter processing may rely on the deviceReason event 'MibUploadDone' as a result of the FSM processing
+	 *   otherwise some processing synchronization would be required - cmp. e.g TechProfile processing
+	 */
+	pMibUlFsm := pDevEntry.pMibUploadFsm.pFsm
+	if pMibUlFsm != nil {
+		if pMibUlFsm.Is(ulStDisabled) {
+			if err := pMibUlFsm.Event(ulEvStart); err != nil {
+				logger.Errorw("MibSyncFsm: Can't go to state starting", log.Fields{"err": err})
+				return errors.New("can't go to state starting")
+			}
+			logger.Debugw("MibSyncFsm", log.Fields{"state": string(pMibUlFsm.Current())})
+			//Determine ONU status and start/re-start MIB Synchronization tasks
+			//Determine if this ONU has ever synchronized
+			if true { //TODO: insert valid check
+				if err := pMibUlFsm.Event(ulEvResetMib); err != nil {
+					logger.Errorw("MibSyncFsm: Can't go to state resetting_mib", log.Fields{"err": err})
+					return errors.New("can't go to state resetting_mib")
+				}
+			} else {
+				if err := pMibUlFsm.Event(ulEvExamineMds); err != nil {
+					logger.Errorw("MibSyncFsm: Can't go to state examine_mds", log.Fields{"err": err})
+					return errors.New("can't go to examine_mds")
+				}
+				logger.Debugw("state of MibSyncFsm", log.Fields{"state": string(pMibUlFsm.Current())})
+				//Examine the MIB Data Sync
+				// callbacks to be handled:
+				// Event(ulEvSuccess)
+				// Event(ulEvTimeout)
+				// Event(ulEvMismatch)
+			}
+		} else {
+			logger.Errorw("wrong state of MibSyncFsm - want: disabled", log.Fields{"have": string(pMibUlFsm.Current())})
+			return errors.New("wrong state of MibSyncFsm")
+		}
+	} else {
+		logger.Errorw("MibSyncFsm invalid - cannot be executed!!", log.Fields{"device-id": dh.deviceID})
+		return errors.New("cannot execut MibSync")
+	}
+	return nil
+}
+
+func (dh *deviceHandler) updateInterface(onuind *oop.OnuIndication) error {
+	if dh.deviceReason != "stopping-openomci" {
+		logger.Debugw("updateInterface-started - stopping-device", log.Fields{"device-id": dh.deviceID})
+		//stop all running SM processing - make use of the DH-state as mirrored in the deviceReason
+		pDevEntry := dh.getOnuDeviceEntry(false)
+		if pDevEntry == nil {
+			logger.Errorw("No valid OnuDevice -aborting", log.Fields{"device-id": dh.deviceID})
+			return errors.New("no valid OnuDevice")
+		}
+
+		switch dh.deviceReason {
+		case "starting-openomci":
+			{ //MIBSync FSM may run
+				pMibUlFsm := pDevEntry.pMibUploadFsm.pFsm
+				if pMibUlFsm != nil {
+					_ = pMibUlFsm.Event(ulEvStop) //TODO!! verify if MibSyncFsm stop-processing is sufficient (to allow it again afterwards)
+				}
+			}
+		case "discovery-mibsync-complete":
+			{ //MibDownload may run
+				pMibDlFsm := pDevEntry.pMibDownloadFsm.pFsm
+				if pMibDlFsm != nil {
+					_ = pMibDlFsm.Event(dlEvReset)
+				}
+			}
+		default:
+			{
+				//port lock/unlock FSM's may be active
+				if dh.pUnlockStateFsm != nil {
+					_ = dh.pUnlockStateFsm.pAdaptFsm.pFsm.Event(uniEvReset)
+				}
+				if dh.pLockStateFsm != nil {
+					_ = dh.pLockStateFsm.pAdaptFsm.pFsm.Event(uniEvReset)
+				}
+				//techProfile related PonAniConfigFsm FSM may be active
+				// maybe encapsulated as OnuTP method - perhaps later in context of module splitting
+				if dh.pOnuTP.pAniConfigFsm != nil {
+					_ = dh.pOnuTP.pAniConfigFsm.pAdaptFsm.pFsm.Event(aniEvReset)
+				}
+				for _, uniPort := range dh.uniEntityMap {
+					//reset the TechProfileConfig Done state for all (active) UNI's
+					dh.pOnuTP.setConfigDone(uniPort.uniID, false)
+					// reset the possibly existing VlanConfigFsm
+					if pVlanFilterFsm, exist := dh.UniVlanConfigFsmMap[uniPort.uniID]; exist {
+						//VlanFilterFsm exists and was already started
+						pVlanFilterStatemachine := pVlanFilterFsm.pAdaptFsm.pFsm
+						if pVlanFilterStatemachine != nil {
+							_ = pVlanFilterStatemachine.Event(vlanEvReset)
+						}
+					}
+				}
+			}
+			//TODO!!! care about PM/Alarm processing once started
+		}
+		//TODO: from here the deviceHandler FSM itself may be stuck in some of the initial states
+		//  (mainly the still separate 'Event states')
+		//  so it is questionable, how this is resolved after some possible re-enable
+		//  assumption there is obviously, that the system may continue with some 'after "mib-download-done" state'
+
+		//stop/remove(?) the device entry
+		_ = pDevEntry.stop(context.TODO()) //maybe some more sophisticated context treatment should be used here?
+
+		//TODO!!! remove existing traffic profiles
+		/* from py code, if TP's exist, remove them - not yet implemented
+		self._tp = dict()
+		# Let TP download happen again
+		for uni_id in self._tp_service_specific_task:
+			self._tp_service_specific_task[uni_id].clear()
+		for uni_id in self._tech_profile_download_done:
+			self._tech_profile_download_done[uni_id].clear()
+		*/
+
+		dh.disableUniPortStateUpdate()
+
+		if err := dh.coreProxy.DeviceReasonUpdate(context.TODO(), dh.deviceID, "stopping-openomci"); err != nil {
+			//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+			logger.Errorw("error-DeviceReasonUpdate to 'stopping-openomci'",
+				log.Fields{"device-id": dh.deviceID, "error": err})
+			// abort: system behavior is just unstable ...
+			return err
+		}
+		dh.deviceReason = "stopping-openomci"
+
+		if err := dh.coreProxy.DeviceStateUpdate(context.TODO(), dh.deviceID,
+			voltha.ConnectStatus_UNREACHABLE, voltha.OperStatus_DISCOVERED); err != nil {
+			//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+			logger.Errorw("error-updating-device-state unreachable-discovered",
+				log.Fields{"device-id": dh.deviceID, "error": err})
+			// abort: system behavior is just unstable ...
+			return err
+		}
+	} else {
+		logger.Debugw("updateInterface - device already stopped", log.Fields{"device-id": dh.deviceID})
+	}
+	return nil
+}
+
+func (dh *deviceHandler) processMibDatabaseSyncEvent(devEvent OnuDeviceEvent) {
+	logger.Debugw("MibInSync event received", log.Fields{"device-id": dh.deviceID})
+	if !dh.reconciling {
+		//initiate DevStateUpdate
+		if err := dh.coreProxy.DeviceReasonUpdate(context.TODO(), dh.deviceID, "discovery-mibsync-complete"); err != nil {
+			//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+			logger.Errorw("error-DeviceReasonUpdate to 'mibsync-complete'", log.Fields{
+				"device-id": dh.deviceID, "error": err})
+		} else {
+			logger.Infow("dev reason updated to 'MibSync complete'", log.Fields{"deviceID": dh.deviceID})
+		}
+	} else {
+		logger.Debugw("reconciling - don't notify core about DeviceReasonUpdate to mibsync-complete",
+			log.Fields{"device-id": dh.deviceID})
+	}
+	dh.deviceReason = "discovery-mibsync-complete"
+
+	i := uint8(0) //UNI Port limit: see MaxUnisPerOnu (by now 16) (OMCI supports max 255 p.b.)
+	pDevEntry := dh.getOnuDeviceEntry(false)
+	if unigInstKeys := pDevEntry.pOnuDB.getSortedInstKeys(me.UniGClassID); len(unigInstKeys) > 0 {
+		for _, mgmtEntityID := range unigInstKeys {
+			logger.Debugw("Add UNI port for stored UniG instance:", log.Fields{
+				"device-id": dh.deviceID, "UnigMe EntityID": mgmtEntityID})
+			dh.addUniPort(mgmtEntityID, i, uniPPTP)
+			i++
+		}
+	} else {
+		logger.Debugw("No UniG instances found", log.Fields{"device-id": dh.deviceID})
+	}
+	if veipInstKeys := pDevEntry.pOnuDB.getSortedInstKeys(me.VirtualEthernetInterfacePointClassID); len(veipInstKeys) > 0 {
+		for _, mgmtEntityID := range veipInstKeys {
+			logger.Debugw("Add VEIP acc. to stored VEIP instance:", log.Fields{
+				"device-id": dh.deviceID, "VEIP EntityID": mgmtEntityID})
+			dh.addUniPort(mgmtEntityID, i, uniVEIP)
+			i++
+		}
+	} else {
+		logger.Debugw("No VEIP instances found", log.Fields{"device-id": dh.deviceID})
+	}
+	if i == 0 {
+		logger.Warnw("No PPTP instances found", log.Fields{"device-id": dh.deviceID})
+	}
+
+	/* 200605: lock processing after initial MIBUpload removed now as the ONU should be in the lock state per default here
+	 *  left the code here as comment in case such processing should prove needed unexpectedly
+			// Init Uni Ports to Admin locked state
+			// maybe not really needed here as UNI ports should be locked by default, but still left as available in python code
+			// *** should generate UniLockStateDone event *****
+			if dh.pLockStateFsm == nil {
+				dh.createUniLockFsm(true, UniLockStateDone)
+			} else { //LockStateFSM already init
+				dh.pLockStateFsm.SetSuccessEvent(UniLockStateDone)
+				dh.runUniLockFsm(true)
+			}
+		}
+	case UniLockStateDone:
+		{
+			logger.Infow("UniLockStateDone event: Starting MIB download", log.Fields{"device-id": dh.deviceID})
+	* lockState processing commented out
+	*/
+	/*  Mib download procedure -
+	***** should run over 'downloaded' state and generate MibDownloadDone event *****
+	 */
+	pMibDlFsm := pDevEntry.pMibDownloadFsm.pFsm
+	if pMibDlFsm != nil {
+		if pMibDlFsm.Is(dlStDisabled) {
+			if err := pMibDlFsm.Event(dlEvStart); err != nil {
+				logger.Errorw("MibDownloadFsm: Can't go to state starting", log.Fields{"err": err})
+				// maybe try a FSM reset and then again ... - TODO!!!
+			} else {
+				logger.Debugw("MibDownloadFsm", log.Fields{"state": string(pMibDlFsm.Current())})
+				// maybe use more specific states here for the specific download steps ...
+				if err := pMibDlFsm.Event(dlEvCreateGal); err != nil {
+					logger.Errorw("MibDownloadFsm: Can't start CreateGal", log.Fields{"err": err})
+				} else {
+					logger.Debugw("state of MibDownloadFsm", log.Fields{"state": string(pMibDlFsm.Current())})
+					//Begin MIB data download (running autonomously)
+				}
+			}
+		} else {
+			logger.Errorw("wrong state of MibDownloadFsm - want: disabled", log.Fields{"have": string(pMibDlFsm.Current())})
+			// maybe try a FSM reset and then again ... - TODO!!!
+		}
+		/***** Mib download started */
+	} else {
+		logger.Errorw("MibDownloadFsm invalid - cannot be executed!!", log.Fields{"device-id": dh.deviceID})
+	}
+}
+
+func (dh *deviceHandler) processMibDownloadDoneEvent(devEvent OnuDeviceEvent) {
+	logger.Debugw("MibDownloadDone event received", log.Fields{"device-id": dh.deviceID})
+	if !dh.reconciling {
+		if err := dh.coreProxy.DeviceStateUpdate(context.TODO(), dh.deviceID,
+			voltha.ConnectStatus_REACHABLE, voltha.OperStatus_ACTIVE); err != nil {
+			//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+			logger.Errorw("error-updating-device-state", log.Fields{"device-id": dh.deviceID, "error": err})
+		} else {
+			logger.Debugw("dev state updated to 'Oper.Active'", log.Fields{"device-id": dh.deviceID})
+		}
+	} else {
+		logger.Debugw("reconciling - don't notify core about DeviceStateUpdate to ACTIVE",
+			log.Fields{"device-id": dh.deviceID})
+	}
+	if !dh.reconciling {
+		if err := dh.coreProxy.DeviceReasonUpdate(context.TODO(), dh.deviceID, "initial-mib-downloaded"); err != nil {
+			//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+			logger.Errorw("error-DeviceReasonUpdate to 'initial-mib-downloaded'",
+				log.Fields{"device-id": dh.deviceID, "error": err})
+		} else {
+			logger.Infow("dev reason updated to 'initial-mib-downloaded'", log.Fields{"device-id": dh.deviceID})
+		}
+	} else {
+		logger.Debugw("reconciling - don't notify core about DeviceReasonUpdate to initial-mib-downloaded",
+			log.Fields{"device-id": dh.deviceID})
+	}
+	dh.deviceReason = "initial-mib-downloaded"
+	if dh.pUnlockStateFsm == nil {
+		dh.createUniLockFsm(false, UniUnlockStateDone)
+	} else { //UnlockStateFSM already init
+		dh.pUnlockStateFsm.setSuccessEvent(UniUnlockStateDone)
+		dh.runUniLockFsm(false)
+	}
+}
+
+func (dh *deviceHandler) processUniUnlockStateDoneEvent(devEvent OnuDeviceEvent) {
+	go dh.enableUniPortStateUpdate() //cmp python yield self.enable_ports()
+
+	if !dh.reconciling {
+		logger.Infow("UniUnlockStateDone event: Sending OnuUp event", log.Fields{"device-id": dh.deviceID})
+		raisedTs := time.Now().UnixNano()
+		go dh.sendOnuOperStateEvent(voltha.OperStatus_ACTIVE, dh.deviceID, raisedTs) //cmp python onu_active_event
+	} else {
+		logger.Debugw("reconciling - don't notify core that onu went to active but trigger tech profile config",
+			log.Fields{"device-id": dh.deviceID})
+		go dh.reconcileDeviceTechProf()
+		//TODO: further actions e.g. restore flows, metrics, ...
+	}
+}
+
+func (dh *deviceHandler) processOmciAniConfigDoneEvent(devEvent OnuDeviceEvent) {
+	logger.Debugw("OmciAniConfigDone event received", log.Fields{"device-id": dh.deviceID})
+	if dh.deviceReason != "tech-profile-config-download-success" {
+		// which may be the case from some previous actvity on another UNI Port of the ONU
+		if !dh.reconciling {
+			if err := dh.coreProxy.DeviceReasonUpdate(context.TODO(), dh.deviceID, "tech-profile-config-download-success"); err != nil {
+				//TODO with VOL-3045/VOL-3046: return the error and stop further processing
+				logger.Errorw("error-DeviceReasonUpdate to 'tech-profile-config-download-success'",
+					log.Fields{"device-id": dh.deviceID, "error": err})
+			} else {
+				logger.Infow("update dev reason to 'tech-profile-config-download-success'",
+					log.Fields{"device-id": dh.deviceID})
+			}
+		} else {
+			logger.Debugw("reconciling - don't notify core about DeviceReasonUpdate to tech-profile-config-download-success",
+				log.Fields{"device-id": dh.deviceID})
+		}
+		//set internal state anyway - as it was done
+		dh.deviceReason = "tech-profile-config-download-success"
+	}
+}
+
+func (dh *deviceHandler) processOmciVlanFilterDoneEvent(devEvent OnuDeviceEvent) {
+	logger.Debugw("OmciVlanFilterDone event received",
+		log.Fields{"device-id": dh.deviceID})
+
+	if dh.deviceReason != "omci-flows-pushed" {
+		// which may be the case from some previous actvity on another UNI Port of the ONU
+		// or even some previous flow add activity on the same port
+		if err := dh.coreProxy.DeviceReasonUpdate(context.TODO(), dh.deviceID, "omci-flows-pushed"); err != nil {
+			logger.Errorw("error-DeviceReasonUpdate to 'omci-flows-pushed'",
+				log.Fields{"device-id": dh.deviceID, "error": err})
+		} else {
+			logger.Infow("updated dev reason to ''omci-flows-pushed'",
+				log.Fields{"device-id": dh.deviceID})
+		}
+		//set internal state anyway - as it was done
+		dh.deviceReason = "omci-flows-pushed"
+	}
+}
+
+//deviceProcStatusUpdate evaluates possible processing events and initiates according next activities
+func (dh *deviceHandler) deviceProcStatusUpdate(devEvent OnuDeviceEvent) {
+	switch devEvent {
+	case MibDatabaseSync:
+		{
+			dh.processMibDatabaseSyncEvent(devEvent)
+		}
+	case MibDownloadDone:
+		{
+			dh.processMibDownloadDoneEvent(devEvent)
+
+		}
+	case UniUnlockStateDone:
+		{
+			dh.processUniUnlockStateDoneEvent(devEvent)
+
+		}
+	case OmciAniConfigDone:
+		{
+			dh.processOmciAniConfigDoneEvent(devEvent)
+
+		}
+	case OmciVlanFilterDone:
+		{
+			dh.processOmciVlanFilterDoneEvent(devEvent)
+
+		}
+	default:
+		{
+			logger.Warnw("unhandled-device-event", log.Fields{"device-id": dh.deviceID, "event": devEvent})
+		}
+	} //switch
+}
+
+func (dh *deviceHandler) addUniPort(aUniInstNo uint16, aUniID uint8, aPortType uniPortType) {
+	uniNo := mkUniPortNum(dh.pOnuIndication.GetIntfId(), dh.pOnuIndication.GetOnuId(),
+		uint32(aUniID))
+	if _, present := dh.uniEntityMap[uniNo]; present {
+		logger.Warnw("onuUniPort-add: Port already exists", log.Fields{"for InstanceId": aUniInstNo})
+	} else {
+		//with arguments aUniID, a_portNo, aPortType
+		pUniPort := newOnuUniPort(aUniID, uniNo, aUniInstNo, aPortType)
+		if pUniPort == nil {
+			logger.Warnw("onuUniPort-add: Could not create Port", log.Fields{"for InstanceId": aUniInstNo})
+		} else {
+			//store UniPort with the System-PortNumber key
+			dh.uniEntityMap[uniNo] = pUniPort
+			if !dh.reconciling {
+				// create announce the UniPort to the core as VOLTHA Port object
+				if err := pUniPort.createVolthaPort(dh); err == nil {
+					logger.Infow("onuUniPort-added", log.Fields{"for PortNo": uniNo})
+				} //error logging already within UniPort method
+			} else {
+				logger.Debugw("reconciling - onuUniPort already added", log.Fields{"for PortNo": uniNo, "device-id": dh.deviceID})
+			}
+		}
+	}
+}
+
+// enableUniPortStateUpdate enables UniPortState and update core port state accordingly
+func (dh *deviceHandler) enableUniPortStateUpdate() {
+
+
+	for uniNo, uniPort := range dh.uniEntityMap {
+		// only if this port is validated for operState transfer
+		if (1<<uniPort.uniID)&activeUniPortStateUpdateMask == (1 << uniPort.uniID) {
+			logger.Infow("onuUniPort-forced-OperState-ACTIVE", log.Fields{"for PortNo": uniNo})
+			uniPort.setOperState(vc.OperStatus_ACTIVE)
+			if !dh.reconciling {
+				//maybe also use getter functions on uniPort - perhaps later ...
+				go dh.coreProxy.PortStateUpdate(context.TODO(), dh.deviceID, voltha.Port_ETHERNET_UNI, uniPort.portNo, uniPort.operState)
+			} else {
+				logger.Debugw("reconciling - don't notify core about PortStateUpdate", log.Fields{"device-id": dh.deviceID})
+			}
+		}
+	}
+}
+
+// Disable UniPortState and update core port state accordingly
+func (dh *deviceHandler) disableUniPortStateUpdate() {
+	for uniNo, uniPort := range dh.uniEntityMap {
+		// only if this port is validated for operState transfer
+		if (1<<uniPort.uniID)&activeUniPortStateUpdateMask == (1 << uniPort.uniID) {
+			logger.Infow("onuUniPort-forced-OperState-UNKNOWN", log.Fields{"for PortNo": uniNo})
+			uniPort.setOperState(vc.OperStatus_UNKNOWN)
+			//maybe also use getter functions on uniPort - perhaps later ...
+			go dh.coreProxy.PortStateUpdate(context.TODO(), dh.deviceID, voltha.Port_ETHERNET_UNI, uniPort.portNo, uniPort.operState)
+		}
+	}
+}
+
+// ONU_Active/Inactive announcement on system KAFKA bus
+// tried to re-use procedure of oltUpDownIndication from openolt_eventmgr.go with used values from Py code
+func (dh *deviceHandler) sendOnuOperStateEvent(aOperState vc.OperStatus_Types, aDeviceID string, raisedTs int64) {
+	var de voltha.DeviceEvent
+	eventContext := make(map[string]string)
+	parentDevice, err := dh.coreProxy.GetDevice(context.TODO(), dh.parentID, dh.parentID)
+	if err != nil || parentDevice == nil {
+		logger.Errorw("Failed to fetch parent device for OnuEvent",
+			log.Fields{"parentID": dh.parentID, "err": err})
+	}
+	oltSerialNumber := parentDevice.SerialNumber
+
+	eventContext["pon-id"] = strconv.FormatUint(uint64(dh.pOnuIndication.IntfId), 10)
+	eventContext["onu-id"] = strconv.FormatUint(uint64(dh.pOnuIndication.OnuId), 10)
+	eventContext["serial-number"] = dh.device.SerialNumber
+	eventContext["olt_serial_number"] = oltSerialNumber
+	eventContext["device_id"] = aDeviceID
+	eventContext["registration_id"] = aDeviceID //py: string(device_id)??
+	logger.Debugw("prepare ONU_ACTIVATED event",
+		log.Fields{"DeviceId": aDeviceID, "EventContext": eventContext})
+
+	/* Populating device event body */
+	de.Context = eventContext
+	de.ResourceId = aDeviceID
+	if aOperState == voltha.OperStatus_ACTIVE {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", cOnuActivatedEvent, "RAISE_EVENT")
+		de.Description = fmt.Sprintf("%s Event - %s - %s",
+			cEventObjectType, cOnuActivatedEvent, "Raised")
+	} else {
+		de.DeviceEventName = fmt.Sprintf("%s_%s", cOnuActivatedEvent, "CLEAR_EVENT")
+		de.Description = fmt.Sprintf("%s Event - %s - %s",
+			cEventObjectType, cOnuActivatedEvent, "Cleared")
+	}
+	/* Send event to KAFKA */
+	if err := dh.EventProxy.SendDeviceEvent(&de, equipment, pon, raisedTs); err != nil {
+		logger.Warnw("could not send ONU_ACTIVATED event",
+			log.Fields{"device-id": aDeviceID, "error": err})
+	}
+	logger.Debugw("ONU_ACTIVATED event sent to KAFKA",
+		log.Fields{"device-id": aDeviceID, "with-EventName": de.DeviceEventName})
+}
+
+// createUniLockFsm initializes and runs the UniLock FSM to transfer the OMCI related commands for port lock/unlock
+func (dh *deviceHandler) createUniLockFsm(aAdminState bool, devEvent OnuDeviceEvent) {
+	chLSFsm := make(chan Message, 2048)
+	var sFsmName string
+	if aAdminState {
+		logger.Infow("createLockStateFSM", log.Fields{"device-id": dh.deviceID})
+		sFsmName = "LockStateFSM"
+	} else {
+		logger.Infow("createUnlockStateFSM", log.Fields{"device-id": dh.deviceID})
+		sFsmName = "UnLockStateFSM"
+	}
+
+	pDevEntry := dh.getOnuDeviceEntry(true)
+	if pDevEntry == nil {
+		logger.Errorw("No valid OnuDevice -aborting", log.Fields{"device-id": dh.deviceID})
+		return
+	}
+	pLSFsm := newLockStateFsm(pDevEntry.PDevOmciCC, aAdminState, devEvent,
+		sFsmName, dh.deviceID, chLSFsm)
+	if pLSFsm != nil {
+		if aAdminState {
+			dh.pLockStateFsm = pLSFsm
+		} else {
+			dh.pUnlockStateFsm = pLSFsm
+		}
+		dh.runUniLockFsm(aAdminState)
+	} else {
+		logger.Errorw("LockStateFSM could not be created - abort!!", log.Fields{"device-id": dh.deviceID})
+	}
+}
+
+// runUniLockFsm starts the UniLock FSM to transfer the OMCI related commands for port lock/unlock
+func (dh *deviceHandler) runUniLockFsm(aAdminState bool) {
+	/*  Uni Port lock/unlock procedure -
+	 ***** should run via 'adminDone' state and generate the argument requested event *****
+	 */
+	var pLSStatemachine *fsm.FSM
+	if aAdminState {
+		pLSStatemachine = dh.pLockStateFsm.pAdaptFsm.pFsm
+		//make sure the opposite FSM is not running and if so, terminate it as not relevant anymore
+		if (dh.pUnlockStateFsm != nil) &&
+			(dh.pUnlockStateFsm.pAdaptFsm.pFsm.Current() != uniStDisabled) {
+			_ = dh.pUnlockStateFsm.pAdaptFsm.pFsm.Event(uniEvReset)
+		}
+	} else {
+		pLSStatemachine = dh.pUnlockStateFsm.pAdaptFsm.pFsm
+		//make sure the opposite FSM is not running and if so, terminate it as not relevant anymore
+		if (dh.pLockStateFsm != nil) &&
+			(dh.pLockStateFsm.pAdaptFsm.pFsm.Current() != uniStDisabled) {
+			_ = dh.pLockStateFsm.pAdaptFsm.pFsm.Event(uniEvReset)
+		}
+	}
+	if pLSStatemachine != nil {
+		if pLSStatemachine.Is(uniStDisabled) {
+			if err := pLSStatemachine.Event(uniEvStart); err != nil {
+				logger.Warnw("LockStateFSM: can't start", log.Fields{"err": err})
+				// maybe try a FSM reset and then again ... - TODO!!!
+			} else {
+				/***** LockStateFSM started */
+				logger.Debugw("LockStateFSM started", log.Fields{
+					"state": pLSStatemachine.Current(), "device-id": dh.deviceID})
+			}
+		} else {
+			logger.Warnw("wrong state of LockStateFSM - want: disabled", log.Fields{
+				"have": pLSStatemachine.Current(), "device-id": dh.deviceID})
+			// maybe try a FSM reset and then again ... - TODO!!!
+		}
+	} else {
+		logger.Errorw("LockStateFSM StateMachine invalid - cannot be executed!!", log.Fields{"device-id": dh.deviceID})
+		// maybe try a FSM reset and then again ... - TODO!!!
+	}
+}
+
+//setBackend provides a DB backend for the specified path on the existing KV client
+func (dh *deviceHandler) setBackend(aBasePathKvStore string) *db.Backend {
+	addr := dh.pOpenOnuAc.KVStoreHost + ":" + strconv.Itoa(dh.pOpenOnuAc.KVStorePort)
+	logger.Debugw("SetKVStoreBackend", log.Fields{"IpTarget": addr,
+		"BasePathKvStore": aBasePathKvStore, "device-id": dh.deviceID})
+	kvbackend := &db.Backend{
+		Client:    dh.pOpenOnuAc.kvClient,
+		StoreType: dh.pOpenOnuAc.KVStoreType,
+		/* address config update acc. to [VOL-2736] */
+		Address:    addr,
+		Timeout:    dh.pOpenOnuAc.KVStoreTimeout,
+		PathPrefix: aBasePathKvStore}
+
+	return kvbackend
+}
+func (dh *deviceHandler) getFlowOfbFields(apFlowItem *ofp.OfpFlowStats, loMatchVlan *uint16,
+	loAddPcp *uint8, loIPProto *uint32) {
+
+	for _, field := range flow.GetOfbFields(apFlowItem) {
+		switch field.Type {
+		case of.OxmOfbFieldTypes_OFPXMT_OFB_ETH_TYPE:
+			{
+				logger.Debugw("FlowAdd type EthType", log.Fields{"device-id": dh.deviceID,
+					"EthType": strconv.FormatInt(int64(field.GetEthType()), 16)})
+			}
+		case of.OxmOfbFieldTypes_OFPXMT_OFB_IP_PROTO:
+			{
+				*loIPProto = field.GetIpProto()
+				logger.Debugw("FlowAdd type IpProto", log.Fields{"device-id": dh.deviceID,
+					"IpProto": strconv.FormatInt(int64(*loIPProto), 16)})
+				if *loIPProto == 2 {
+					// some workaround for TT workflow at proto == 2 (IGMP trap) -> ignore the flow
+					// avoids installing invalid EVTOCD rule
+					logger.Debugw("FlowAdd type IpProto 2: TT workaround: ignore flow",
+						log.Fields{"device-id": dh.deviceID,
+							"IpProto": strconv.FormatInt(int64(*loIPProto), 16)})
+					return
+				}
+			}
+		case of.OxmOfbFieldTypes_OFPXMT_OFB_VLAN_VID:
+			{
+				*loMatchVlan = uint16(field.GetVlanVid())
+				loMatchVlanMask := uint16(field.GetVlanVidMask())
+				if !(*loMatchVlan == uint16(of.OfpVlanId_OFPVID_PRESENT) &&
+					loMatchVlanMask == uint16(of.OfpVlanId_OFPVID_PRESENT)) {
+					*loMatchVlan = *loMatchVlan & 0xFFF // not transparent: copy only ID bits
+				}
+				logger.Debugw("FlowAdd field type", log.Fields{"device-id": dh.deviceID,
+					"VID": strconv.FormatInt(int64(*loMatchVlan), 16)})
+			}
+		case of.OxmOfbFieldTypes_OFPXMT_OFB_VLAN_PCP:
+			{
+				*loAddPcp = uint8(field.GetVlanPcp())
+				logger.Debugw("FlowAdd field type", log.Fields{"device-id": dh.deviceID,
+					"PCP": loAddPcp})
+			}
+		case of.OxmOfbFieldTypes_OFPXMT_OFB_UDP_DST:
+			{
+				logger.Debugw("FlowAdd field type", log.Fields{"device-id": dh.deviceID,
+					"UDP-DST": strconv.FormatInt(int64(field.GetUdpDst()), 16)})
+			}
+		case of.OxmOfbFieldTypes_OFPXMT_OFB_UDP_SRC:
+			{
+				logger.Debugw("FlowAdd field type", log.Fields{"device-id": dh.deviceID,
+					"UDP-SRC": strconv.FormatInt(int64(field.GetUdpSrc()), 16)})
+			}
+		case of.OxmOfbFieldTypes_OFPXMT_OFB_IPV4_DST:
+			{
+				logger.Debugw("FlowAdd field type", log.Fields{"device-id": dh.deviceID,
+					"IPv4-DST": field.GetIpv4Dst()})
+			}
+		case of.OxmOfbFieldTypes_OFPXMT_OFB_IPV4_SRC:
+			{
+				logger.Debugw("FlowAdd field type", log.Fields{"device-id": dh.deviceID,
+					"IPv4-SRC": field.GetIpv4Src()})
+			}
+		case of.OxmOfbFieldTypes_OFPXMT_OFB_METADATA:
+			{
+				logger.Debugw("FlowAdd field type", log.Fields{"device-id": dh.deviceID,
+					"Metadata": field.GetTableMetadata()})
+			}
+			/*
+				default:
+					{
+						//all other entires ignored
+					}
+			*/
+		}
+	} //for all OfbFields
+}
+
+func (dh *deviceHandler) getFlowActions(apFlowItem *ofp.OfpFlowStats, loSetPcp *uint8, loSetVlan *uint16) {
+	for _, action := range flow.GetActions(apFlowItem) {
+		switch action.Type {
+		/* not used:
+		case of.OfpActionType_OFPAT_OUTPUT:
+			{
+				logger.Debugw("FlowAdd action type", log.Fields{"device-id": dh.deviceID,
+					"Output": action.GetOutput()})
+			}
+		*/
+		case of.OfpActionType_OFPAT_PUSH_VLAN:
+			{
+				logger.Debugw("FlowAdd action type", log.Fields{"device-id": dh.deviceID,
+					"PushEthType": strconv.FormatInt(int64(action.GetPush().Ethertype), 16)})
+			}
+		case of.OfpActionType_OFPAT_SET_FIELD:
+			{
+				pActionSetField := action.GetSetField()
+				if pActionSetField.Field.OxmClass != of.OfpOxmClass_OFPXMC_OPENFLOW_BASIC {
+					logger.Warnw("FlowAdd action SetField invalid OxmClass (ignored)", log.Fields{"device-id": dh.deviceID,
+						"OxcmClass": pActionSetField.Field.OxmClass})
+				}
+				if pActionSetField.Field.GetOfbField().Type == of.OxmOfbFieldTypes_OFPXMT_OFB_VLAN_VID {
+					*loSetVlan = uint16(pActionSetField.Field.GetOfbField().GetVlanVid())
+					logger.Debugw("FlowAdd Set VLAN from SetField action", log.Fields{"device-id": dh.deviceID,
+						"SetVlan": strconv.FormatInt(int64(*loSetVlan), 16)})
+				} else if pActionSetField.Field.GetOfbField().Type == of.OxmOfbFieldTypes_OFPXMT_OFB_VLAN_PCP {
+					*loSetPcp = uint8(pActionSetField.Field.GetOfbField().GetVlanPcp())
+					logger.Debugw("FlowAdd Set PCP from SetField action", log.Fields{"device-id": dh.deviceID,
+						"SetPcp": *loSetPcp})
+				} else {
+					logger.Warnw("FlowAdd action SetField invalid FieldType", log.Fields{"device-id": dh.deviceID,
+						"Type": pActionSetField.Field.GetOfbField().Type})
+				}
+			}
+			/*
+				default:
+					{
+						//all other entires ignored
+					}
+			*/
+		}
+	} //for all Actions
+}
+
+//addFlowItemToUniPort parses the actual flow item to add it to the UniPort
+func (dh *deviceHandler) addFlowItemToUniPort(apFlowItem *ofp.OfpFlowStats, apUniPort *onuUniPort) error {
+	var loSetVlan uint16 = uint16(of.OfpVlanId_OFPVID_NONE)      //noValidEntry
+	var loMatchVlan uint16 = uint16(of.OfpVlanId_OFPVID_PRESENT) //reserved VLANID entry
+	var loAddPcp, loSetPcp uint8
+	var loIPProto uint32
+	/* the TechProfileId is part of the flow Metadata - compare also comment within
+	 * OLT-Adapter:openolt_flowmgr.go
+	 *     Metadata 8 bytes:
+	 *	   Most Significant 2 Bytes = Inner VLAN
+	 *	   Next 2 Bytes = Tech Profile ID(TPID)
+	 *	   Least Significant 4 Bytes = Port ID
+	 *     Flow Metadata carries Tech-Profile (TP) ID and is mandatory in all
+	 *     subscriber related flows.
+	 */
+
+	metadata := flow.GetMetadataFromWriteMetadataAction(apFlowItem)
+	if metadata == 0 {
+		logger.Debugw("FlowAdd invalid metadata - abort",
+			log.Fields{"device-id": dh.deviceID})
+		return errors.New("flowAdd invalid metadata")
+	}
+	loTpID := flow.GetTechProfileIDFromWriteMetaData(metadata)
+	logger.Debugw("FlowAdd TechProfileId", log.Fields{"device-id": dh.deviceID, "TP-Id": loTpID})
+
+	dh.getFlowOfbFields(apFlowItem, &loMatchVlan, &loAddPcp, &loIPProto)
+	if loIPProto == 2 {
+		// some workaround for TT workflow at proto == 2 (IGMP trap) -> ignore the flow
+		// avoids installing invalid EVTOCD rule
+		logger.Debugw("FlowAdd type IpProto 2: TT workaround: ignore flow",
+			log.Fields{"device-id": dh.deviceID,
+				"IpProto": strconv.FormatInt(int64(loIPProto), 16)})
+		return nil
+	}
+	dh.getFlowActions(apFlowItem, &loSetPcp, &loSetVlan)
+
+	if loSetVlan == uint16(of.OfpVlanId_OFPVID_NONE) && loMatchVlan != uint16(of.OfpVlanId_OFPVID_PRESENT) {
+		logger.Errorw("FlowAdd aborted - SetVlanId undefined, but MatchVid set", log.Fields{
+			"device-id": dh.deviceID, "UniPort": apUniPort.portNo,
+			"set_vid":   strconv.FormatInt(int64(loSetVlan), 16),
+			"match_vid": strconv.FormatInt(int64(loMatchVlan), 16)})
+		//TODO!!: Use DeviceId within the error response to rwCore
+		//  likewise also in other error response cases to calling components as requested in [VOL-3458]
+		return errors.New("flowAdd Set/Match VlanId inconsistent")
+	}
+	if loSetVlan == uint16(of.OfpVlanId_OFPVID_NONE) && loMatchVlan == uint16(of.OfpVlanId_OFPVID_PRESENT) {
+		logger.Debugw("FlowAdd vlan-any/copy", log.Fields{"device-id": dh.deviceID})
+		loSetVlan = loMatchVlan //both 'transparent' (copy any)
+	} else {
+		//looks like OMCI value 4097 (copyFromOuter - for Uni double tagged) is not supported here
+		if loSetVlan != uint16(of.OfpVlanId_OFPVID_PRESENT) {
+			// not set to transparent
+			loSetVlan &= 0x0FFF //mask VID bits as prerequisite for vlanConfigFsm
+		}
+		logger.Debugw("FlowAdd vlan-set", log.Fields{"device-id": dh.deviceID})
+	}
+	if _, exist := dh.UniVlanConfigFsmMap[apUniPort.uniID]; exist {
+		logger.Errorw("FlowAdd aborted - FSM already running", log.Fields{
+			"device-id": dh.deviceID, "UniPort": apUniPort.portNo})
+		return errors.New("flowAdd FSM already running")
+	}
+	return dh.createVlanFilterFsm(apUniPort,
+		loTpID, loMatchVlan, loSetVlan, loSetPcp, OmciVlanFilterDone)
+}
+
+// createVlanFilterFsm initializes and runs the VlanFilter FSM to transfer OMCI related VLAN config
+func (dh *deviceHandler) createVlanFilterFsm(apUniPort *onuUniPort,
+	aTpID uint16, aMatchVlan uint16, aSetVlan uint16, aSetPcp uint8, aDevEvent OnuDeviceEvent) error {
+	chVlanFilterFsm := make(chan Message, 2048)
+
+	pDevEntry := dh.getOnuDeviceEntry(true)
+	if pDevEntry == nil {
+		logger.Errorw("No valid OnuDevice -aborting", log.Fields{"device-id": dh.deviceID})
+		return fmt.Errorf("no valid OnuDevice for device-id %x - aborting", dh.deviceID)
+	}
+
+	pVlanFilterFsm := NewUniVlanConfigFsm(dh, pDevEntry.PDevOmciCC, apUniPort, dh.pOnuTP,
+		pDevEntry.pOnuDB, aTpID, aDevEvent, "UniVlanConfigFsm", dh.deviceID, chVlanFilterFsm,
+		dh.pOpenOnuAc.AcceptIncrementalEvto, aMatchVlan, aSetVlan, aSetPcp)
+	if pVlanFilterFsm != nil {
+		dh.UniVlanConfigFsmMap[apUniPort.uniID] = pVlanFilterFsm
+		pVlanFilterStatemachine := pVlanFilterFsm.pAdaptFsm.pFsm
+		if pVlanFilterStatemachine != nil {
+			if pVlanFilterStatemachine.Is(vlanStDisabled) {
+				if err := pVlanFilterStatemachine.Event(vlanEvStart); err != nil {
+					logger.Warnw("UniVlanConfigFsm: can't start", log.Fields{"err": err})
+					return fmt.Errorf("can't start UniVlanConfigFsm for device-id %x", dh.deviceID)
+				}
+				/***** UniVlanConfigFsm started */
+				logger.Debugw("UniVlanConfigFsm started", log.Fields{
+					"state": pVlanFilterStatemachine.Current(), "device-id": dh.deviceID,
+					"UniPort": apUniPort.portNo})
+			} else {
+				logger.Warnw("wrong state of UniVlanConfigFsm - want: disabled", log.Fields{
+					"have": pVlanFilterStatemachine.Current(), "device-id": dh.deviceID})
+				return fmt.Errorf("uniVlanConfigFsm not in expected disabled state for device-id %x", dh.deviceID)
+			}
+		} else {
+			logger.Errorw("UniVlanConfigFsm StateMachine invalid - cannot be executed!!", log.Fields{
+				"device-id": dh.deviceID})
+			return fmt.Errorf("uniVlanConfigFsm invalid for device-id %x", dh.deviceID)
+		}
+	} else {
+		logger.Errorw("UniVlanConfigFsm could not be created - abort!!", log.Fields{
+			"device-id": dh.deviceID, "UniPort": apUniPort.portNo})
+		return fmt.Errorf("uniVlanConfigFsm could not be created for device-id %x", dh.deviceID)
+	}
+	return nil
+}
+
+//verifyUniVlanConfigRequest checks on existence of flow configuration and starts it accordingly
+func (dh *deviceHandler) verifyUniVlanConfigRequest(apUniPort *onuUniPort) {
+	if pVlanFilterFsm, exist := dh.UniVlanConfigFsmMap[apUniPort.uniID]; exist {
+		//VlanFilterFsm exists and was already started (assumed to wait for TechProfile execution here)
+		pVlanFilterStatemachine := pVlanFilterFsm.pAdaptFsm.pFsm
+		if pVlanFilterStatemachine != nil {
+			if pVlanFilterStatemachine.Is(vlanStWaitingTechProf) {
+				if err := pVlanFilterStatemachine.Event(vlanEvContinueConfig); err != nil {
+					logger.Warnw("UniVlanConfigFsm: can't continue processing", log.Fields{"err": err})
+				} else {
+					/***** UniVlanConfigFsm continued */
+					logger.Debugw("UniVlanConfigFsm continued", log.Fields{
+						"state": pVlanFilterStatemachine.Current(), "device-id": dh.deviceID,
+						"UniPort": apUniPort.portNo})
+				}
+			} else {
+				logger.Debugw("no state of UniVlanConfigFsm to be continued", log.Fields{
+					"have": pVlanFilterStatemachine.Current(), "device-id": dh.deviceID})
+			}
+		} else {
+			logger.Debugw("UniVlanConfigFsm StateMachine does not exist, no flow processing", log.Fields{
+				"device-id": dh.deviceID})
+		}
+
+	} // else: nothing to do
+}
+
+//RemoveVlanFilterFsm deletes the stored pointer to the VlanConfigFsm
+// intention is to provide this method to be called from VlanConfigFsm itself, when resources (and methods!) are cleaned up
+func (dh *deviceHandler) RemoveVlanFilterFsm(apUniPort *onuUniPort) {
+	logger.Debugw("remove UniVlanConfigFsm StateMachine", log.Fields{
+		"device-id": dh.deviceID, "uniPort": apUniPort.portNo})
+	delete(dh.UniVlanConfigFsmMap, apUniPort.uniID)
+}