Created question in FIWARE Q/A platform on 25-05-2020 at 12:05
Please, ANSWER this question AT https://stackoverflow.com/questions/62001030/not-supporting-ngsiv2-metadata-in-device-provisioned-attributes

Question:
Not supporting NGSIv2 metadata in device provisioned attributes

Description:
We have used IoT agent -1.14.0 version from docker hub.
We have given the service and servicepath as follows
fiware-service:testiotagent
fiware-servicepath:/

Device registration payload :

,
{"object_id": "l", "name": "luminosity", "type":"Integer",
"metadata":{ "unitCode":

}
}
]
}
]
}

As per iotagent node lib version 2.12.0 ,IoT agent json -1.14.0 version should support the metadata in device provisioned attributes. But still facing issue.
When we try to provision the above device we are getting the below error:

{
"name": "WRONG_SYNTAX",
"message": "Wrong syntax in request: Errors found validating request."
}

I found that iotagent-node-lib have the schema to validate against device registration payload

https://github.com/telefonicaid/iotagent-node-lib/blob/master/lib/templates/createDevice.json

In this json schema there is no metadata schema mentioned in attributes.

I have followed the below steps for metadata in Entity level:

I have removed the metadata in IoT agent
Updated the entity 'urn:ngsi-ld:SENSOR:Motion-10' as below

{
"id":"urn:ngsi-ld:SENSOR:Motion-10",
"type":"SENSOR",
"luminosity":{
"type":"Integer",
"value":"0",
"metadata":{ "unitCode":

}
}

Tried to send measurement and metadata got overriden and got the empty metadata

{
"id":"urn:ngsi-ld:SENSOR:Motion-10",
"type":"SENSOR",
"luminosity":{
"type":"Integer",
"value":"15",
"metadata":{}
}
}

Is it due to the fix given for issue 1788 in fiware-orion ,https://github.com/telefonicaid/fiware-orion/issues?q=1788.
Need some qucik confirmation and help from Fiware experts to overcome this issue, it is very much appreciated.