Created question in FIWARE Q/A platform on 04-05-2021 at 08:05
Please, ANSWER this question AT https://stackoverflow.com/questions/67381102/how-to-change-values-from-writable-basic-datatypes-on-an-opc-ua-server-with-fiwa

Question:
How to change values from writable basic Datatypes on an OPC UA Server with FIWARE OPC UA AGENT

Description:
GOAL
Change writable values on the OPC UA Server by using the Fiware OPC UA Agent.
My test implementation

Adding the Parameter to the "command" and "contextSubscription" sections in the config.json file.
Start a new test environment with OpcUa Agent, Orion Context broker and mongodb.

Expectet behavior
The value on the server is updated when a request is sent to the Context Broker.
Current behaviour

The value of the parameter is read out correctly but with an incorrect data type (string instead of integer).
The value of the parameter is not updated when a request is sent to the Orion Context Broker.

additional informations

config.json

{
"logLevel" : "DEBUG",
"contextBroker" :

{ "host" : "orion", "port" : 1026 }

,
"server" :

{ "port" : 4001, "baseRoot" : "/" }

,
"deviceRegistry" :

{ "type" : "memory" }

,
"mongodb" :

{ "host" : "iotmongo", "port" : "27017", "db" : "iotagent", "retries" : 5, "retryTime" : 5 }

,
"providerUrl" : "http://iotopcua:4001",
"pollingExpiration" : "200000",
"pollingDaemonFrequency" : "20000",
"deviceRegistrationDuration" : "P1M",
"defaultType" : null,
"browseServerOptions" : null,
"service" : "test",
"subservice" : "/test",
"types" : {
"g_communication" : {
"service" : "test",
"subservice" : "/test",
"active" : [

{ "name" : "7:PLC1_7:G_Communication_7:fo_smartControllerActive_b", "type" : "Boolean" }

],
"lazy" : [ ],
"commands" : [

{ "name" : "7:PLC1_7:G_Communication_7:fi_heartbeat_i", "type" : "Command" }

]
}
},
"contexts" : [ {
"id" : "plant",
"type" : "g_communication",
"service" : "test",
"subservice" : "/test",
"polling" : null,
"mappings" : [

{ "ocb_id" : "7:PLC1_7:G_Communication_7:fo_smartControllerActive_b", "opcua_id" : "ns=7;s=G_Communication.fo_smartControllerActive_b", "object_id" : null, "inputArguments" : [] }

]
}],
"contextSubscriptions" : [{
"id" : "plant",
"type" : "g_communication",
"mappings" : [{
"ocb_id" : "7:PLC1_7:G_Communication_7:fi_heartbeat_i",
"opcua_id" : "ns=7;s=G_Communication.fi_heartbeat_i",
"object_id" : "ns=7;s=G_Communication",
"inputArguments" : [

{ "type": "Number" }

]
}]
}]
}

List Entities

curl 'http://localhost:1026/v2/entities/plant/' -H 'fiware-service: test' -H 'fiwate-servicepath: /test' | python -m json.tool
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 684 100 684 0 0 13751 0 -::- -::- -::- 13959
{
"7:PLC1_7:G_Communication_7:fi_heartbeat_i": {
"metadata": {
"ServerTimestamp":

{ "type": "ISO8601", "value": "null" }

,
"SourceTimestamp":

{ "type": "ISO8601", "value": "null" }

},
"type": "string",
"value": "4"
},
"7:PLC1_7:G_Communication_7:fi_heartbeat_i_info": {
"metadata": {},
"type": "commandResult",
"value": " "
},
"7:PLC1_7:G_Communication_7:fi_heartbeat_i_status": {
"metadata": {},
"type": "commandStatus",
"value": "UNKNOWN"
},
"7:PLC1_7:G_Communication_7:fo_smartControllerActive_b": {
"metadata": {
"ServerTimestamp":

{ "type": "ISO8601", "value": "2021-05-04T07:38:01.150Z" }

,
"SourceTimestamp":

{ "type": "ISO8601", "value": "2021-05-04T07:37:59.934Z" }

},
"type": "Boolean",
"value": false
},
"id": "plant",
"type": "g_communication"
}

Registrations

curl 'http://localhost:1026/v2/registrations' -H 'fiware-service: test' -H 'fiwate-servicepath: /test' | python -m json.tool
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 320 100 320 0 0 46049 0 -::- -::- -::- 53333
[
{
"dataProvided": {
"attrs": [
"7:PLC1_7:G_Communication_7:fi_heartbeat_i"
],
"entities": [

{ "id": "plant", "type": "g_communication" }

]
},
"expires": "2021-06-03T07:37:38.00Z",
"id": "6090f9c254b918756abf1a7d",
"provider": {
"http":

{ "url": "http://iotopcua:4001" }

,
"legacyForwarding": true,
"supportedForwardingMode": "all"
},
"status": "active"
}
]

Test communication with iotopcua

curl "http://iotopcua:4001/version"

{"libVersion":"2.12.0-next","port":4001,"baseRoot":"/"}

Request for update

curl -X PUT \
'http://localhost:1026/v2/entities/plant/attrs/7:PLC1_7:G_Communication_7:fi_heartbeat_i?type=g_communication' \
-H 'content-type: application/json' \
-H 'fiware-service: test' \
-H 'fiware-servicepath: /test' \
-d '

{ "value": 2 }

'

Log OCB

from=0.0.0.0 | srv=test | subsrv=/test | comp=Orion | op=logMsg.h[1844]:lmTransactionStart | msg=Starting transaction from 0.0.0.0:54232/v2/entities/plant/attrs/7:PLC1_7:G_Communication_7:fi_heartbeat_i
from=0.0.0.0 | srv=test | subsrv=/test | comp=Orion | op=rest.cpp[874]:servicePathSplit | msg=Service Path 0: '/test'
from=0.0.0.0 | srv=test | subsrv=/test | comp=Orion | op=connectionOperations.cpp[244]:collectionCount | msg=Database Operation Successful (count:

{ _id.id: "plant", _id.type: "g_communication", _id.servicePath: "/test" }

)
from=0.0.0.0 | srv=test | subsrv=/test | comp=Orion | op=connectionOperations.cpp[94]:collectionQuery | msg=Database Operation Successful (query:

{ _id.id: "plant", _id.type: "g_communication", _id.servicePath: "/test" }

)
from=0.0.0.0 | srv=test | subsrv=/test | comp=Orion | op=connectionOperations.cpp[182]:collectionRangedQuery | msg=Database Operation Successful (query: { query: { $or: [

{ contextRegistration.entities.id: "plant", contextRegistration.entities.type: "g_communication" }

, { contextRegistration.entities.id: ".*", contextRegistration.entities.isPattern: "true", contextRegistration.entities.type:

{ $in: [ "g_communication" ] }

}, { contextRegistration.entities.id: ".*", contextRegistration.entities.isPattern: "true", contextRegistration.entities.type:

{ $exists: false }

} ], expiration:

{ $gt: 1620114947 }

, contextRegistration.attrs.name:

{ $in: [ "7:PLC1_7:G_Communication_7:fi_heartbeat_i" ] }

, servicePath: "/test" }, orderby:

{ _id: 1 }

})
from=0.0.0.0 | srv=test | subsrv=/test | comp=Orion | op=logMsg.h[1844]:lmTransactionStart | msg=Starting transaction to http://iotopcua:4001//updateContext
from=0.0.0.0 | srv=test | subsrv=/test | comp=Orion | op=httpRequestSend.cpp[550]:httpRequestSendWithCurl | msg=Sending message 4 to HTTP server: sending message of 458 bytes to HTTP server
from=10.1.17.1 | srv=test | subsrv=/test | comp=Orion | op=logMsg.h[1844]:lmTransactionStart | msg=Starting transaction from 10.1.17.1:58162/v1/updateContext
from=10.1.17.1 | srv=test | subsrv=/test | comp=Orion | op=rest.cpp[874]:servicePathSplit | msg=Service Path 0: '/test'
from=10.1.17.1 | srv=test | subsrv=/test | comp=Orion | op=connectionOperations.cpp[94]:collectionQuery | msg=Database Operation Successful (query:

{ _id.id: "plant", _id.type: "g_communication", _id.servicePath: "/test" }

)
from=10.1.17.1 | srv=test | subsrv=/test | comp=Orion | op=connectionOperations.cpp[454]:collectionUpdate | msg=Database Operation Successful (update: <

{ _id.id: "plant", _id.type: "g_communication", _id.servicePath: "/test" }

, { $set: { attrs.7:PLC1_7:G_Communication_7:fi_heartbeat_i_status:

{ value: "PENDING", type: "commandStatus", mdNames: [], creDate: 1620113858, modDate: 1620114947 }

, modDate: 1620114947, lastCorrelator: "2324ca1e-acae-11eb-a4f7-226cad26e2cc" }, $unset:

{ location: 1, expDate: 1 }

}>)
from=10.1.17.1 | srv=test | subsrv=/test | comp=Orion | op=logMsg.h[1874]:lmTransactionEnd | msg=Transaction ended
from=0.0.0.0 | srv=test | subsrv=/test | comp=Orion | op=httpRequestSend.cpp[570]:httpRequestSendWithCurl | msg=Notification Successfully Sent to http://iotopcua:4001//updateContext
from=0.0.0.0 | srv=test | subsrv=/test | comp=Orion | op=httpRequestSend.cpp[579]:httpRequestSendWithCurl | msg=Notification response OK, http code: 200
from=0.0.0.0 | srv=test | subsrv=/test | comp=Orion | op=logMsg.h[1874]:lmTransactionEnd | msg=Transaction ended

Log OPCUA Client

time=2021-05-04T07:55:47.191Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.GenericMiddlewares | msg=Request for path //updateContext from [iotopcua:4001]
time=2021-05-04T07:55:47.191Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.GenericMiddlewares | msg=Body:

{
"contextElements": [
{
"type": "g_communication",
"isPattern": "false",
"id": "plant",
"attributes": [

{ "name": "7:PLC1_7:G_Communication_7:fi_heartbeat_i", "type": "Number", "value": 2 }

]
}
],
"updateAction": "UPDATE"
}

time=2021-05-04T07:55:47.193Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.ContextServer | msg=Handling update from [iotopcua:4001]
time=2021-05-04T07:55:47.193Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.ContextServer | msg=[object Object]
time=2021-05-04T07:55:47.194Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.InMemoryGroupRegister | msg=Looking for device params ["service","subservice","type"]
time=2021-05-04T07:55:47.194Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.DeviceService | msg=deviceData after merge with conf: {"id":"plant","name":"plant","type":"g_communication","active":[

{"name":"7:PLC1_7:G_Communication_7:fo_smartControllerActive_b","type":"Boolean","object_id":"7:PLC1_7:G_Communication_7:fo_smartControllerActive_b"}

],"service":"test","subservice":"/test","polling":null,"endpoint":"opc.tcp://109.68.106.155:48050","registrationId":"6090f9c254b918756abf1a7d","creationDate":1620113858802}
time=2021-05-04T07:55:47.194Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.DeviceService | msg=deviceData before merge with conf: {"id":"plant","name":"plant","type":"g_communication","active":[

{"name":"7:PLC1_7:G_Communication_7:fo_smartControllerActive_b","type":"Boolean","object_id":"7:PLC1_7:G_Communication_7:fo_smartControllerActive_b"}

],"lazy":[],"commands":[

{"name":"7:PLC1_7:G_Communication_7:fi_heartbeat_i","type":"Command","object_id":"7:PLC1_7:G_Communication_7:fi_heartbeat_i"}

],"service":"test","subservice":"/test","polling":null,"endpoint":"opc.tcp://109.68.106.155:48050","registrationId":"6090f9c254b918756abf1a7d","creationDate":1620113858802,"internalAttributes":null,"staticAttributes":[],"subscriptions":[]}
time=2021-05-04T07:55:47.195Z | lvl=INFO | corr=n/a | trans=n/a | op=Index.CommandContextHandler | comp=iotAgent-OPCUA | srv=test | subsrv=/test | msg=method to call =[{"objectId":"ns=7;s=G_Communication","methodId":"ns=7;s=G_Communication.fi_heartbeat_i","inputArguments":[

{"type":"Number"}

]}]
time=2021-05-04T07:55:47.879Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.NGSIService | msg=executeWithDeviceInfo entityName plant type undefined apikey undefined attributes [

{"name":"7:PLC1_7:G_Communication_7:fi_heartbeat_i_status","type":"commandStatus","value":"PENDING"}

] deviceInformation {"id":"plant","name":"plant","type":"g_communication","active":[

{"name":"7:PLC1_7:G_Communication_7:fo_smartControllerActive_b","type":"Boolean","object_id":"7:PLC1_7:G_Communication_7:fo_smartControllerActive_b"}

],"lazy":[],"commands":[

{"name":"7:PLC1_7:G_Communication_7:fi_heartbeat_i","type":"Command","object_id":"7:PLC1_7:G_Communication_7:fi_heartbeat_i"}

],"service":"test","subservice":"/test","polling":null,"endpoint":"opc.tcp://109.68.106.155:48050","registrationId":"6090f9c254b918756abf1a7d","creationDate":1620113858802,"internalAttributes":null,"staticAttributes":[],"subscriptions":[]}
time=2021-05-04T07:55:47.879Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.NGSIService | msg=error

{"name":"DEVICE_GROUP_NOT_FOUND","message":"Couldn\t find device group","code":404}

in get group device
time=2021-05-04T07:55:47.880Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.NGSIService | msg=typeInformation {"id":"plant","name":"plant","type":"g_communication","active":[

{"name":"7:PLC1_7:G_Communication_7:fo_smartControllerActive_b","type":"Boolean","object_id":"7:PLC1_7:G_Communication_7:fo_smartControllerActive_b"}

],"lazy":[],"commands":[

{"name":"7:PLC1_7:G_Communication_7:fi_heartbeat_i","type":"Command","object_id":"7:PLC1_7:G_Communication_7:fi_heartbeat_i"}

],"service":"test","subservice":"/test","polling":null,"endpoint":"opc.tcp://109.68.106.155:48050","registrationId":"6090f9c254b918756abf1a7d","creationDate":1620113858802,"internalAttributes":null,"staticAttributes":[],"subscriptions":[]}
time=2021-05-04T07:55:47.880Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.NGSIService | msg=Updating device value in the Context Broker at http://orion:1026/v1/updateContext
time=2021-05-04T07:55:47.880Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.NGSIService | msg=Using the following request:

{
"url": "http://orion:1026/v1/updateContext&quot;,
"method": "POST",
"headers":

{ "fiware-service": "test", "fiware-servicepath": "/test" }

,
"json": {
"contextElements": [
{
"type": "g_communication",
"isPattern": "false",
"id": "plant",
"attributes": [

{ "name": "7:PLC1_7:G_Communication_7:fi_heartbeat_i_status", "type": "commandStatus", "value": "PENDING" }

]
}
],
"updateAction": "UPDATE"
}
}

time=2021-05-04T07:55:47.886Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.NGSIService | msg=Received the following request from the CB:

{
"contextResponses": [
{
"contextElement": {
"type": "g_communication",
"isPattern": "false",
"id": "plant",
"attributes": [

{ "name": "7:PLC1_7:G_Communication_7:fi_heartbeat_i_status", "type": "commandStatus", "value": "" }

]
},
"statusCode":

{ "code": "200", "reasonPhrase": "OK" }

}
]
}

time=2021-05-04T07:55:47.886Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.NGSIService | msg=Value updated successfully
time=2021-05-04T07:55:47.886Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.ContextServer | msg=Update action from [iotopcua:4001] handled successfully.
time=2021-05-04T07:55:47.886Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.ContextServer | msg=Generated update response: {"contextResponses":[{"contextElement":{"attributes":[

{"name":"7:PLC1_7:G_Communication_7:fi_heartbeat_i","type":"Number","value":""}

],"id":"plant","isPattern":false,"type":"g_communication"},"statusCode":{"code":200,"reasonPhrase":"OK"}}]}
time=2021-05-04T07:55:47.887Z | lvl=DEBUG | corr=n/a | trans=n/a | op=IoTAgentNGSI.DomainControl | msg=response-time: 697