Created question in FIWARE Q/A platform on 20-10-2018 at 19:10
Please, ANSWER this question AT https://stackoverflow.com/questions/52908085/command-doesnt-forward-from-fiware-json-agent-toward-the-broker-mqtt

Question:
Command doesn't forward from FIWARE JSON Agent toward the Broker MQTT

Description:
I've deployed the iot stack with docker. These are the used containers:

fiware/orion:1.13.0
fiware/iotagent-json:1.8.0
eclipse-mosquitto:1.4.12
[other containers not involved in the issue ...]

I've registered the following device on the agent:

{
"device_id": "t3",
"service": "lmobile",
"service_path": "/lmobile_Industry",
"entity_name": "t3",
"entity_type": "Device",
"endpoint": "tcp://<mqttborker_publicip>:<port>",
"transport": "MQTT",
"attributes": [

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

],
"static_attributes": [
....
],
"protocol": "JSON"
}

and the corresponding entity has been properly created on the OCB and when I publish a new measure on the mqttbroker, under the topic /<apikey>/t3/attrs the measure is properly forward toward the OCB.

In order to send the command c to the device I send the following updateContext on OCB:

curl -s -X POST http://:1026/v1/updateContext
-H 'accept: application/json'
-H 'cache-control: no-cache'
-H 'content-type: application/json'
-H 'fiware-service: lmobile'
-H 'fiware-servicepath: /lmobile_Industry'
-d '{
"contextElements": [
{
"type": "Device",
"isPattern": "false",
"id": "t3",
"attributes": [

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

and I receive the following error response:

{
"errorCode":

}

In the OCB Log I can see the following WARNING Message:
time=Thursday 18 Oct 08:55:54 2018.431Z | lvl=WARN | corr=N/A | trans=N/A | from=N/A | srv=N/A | subsrv=N/A | comp=Orion | op=postQueryContext.cpp[169]:queryForward | msg=Other Error (context provider response to QueryContext is empty).
Anyway, the updateContext is properly forwarded to the Agent.

In the Agent Log (in DEBUG) I can see the followings:

iotstack_agent-json.1.xyz@xerus-1 | time=2018-10-18T09:02:33.975Z | lvl=DEBUG | corr=8d2864ec-d2b4-11e8-b445-02420aff0161 | trans=de5680e7-0727-4577-ac44-ddeb59df1f31 | op=IoTAgentNGSI.GenericMiddlewares | srv=lmobile | subsrv=/lmobile_Industry | msg=Request for path [/updateContext] from [<agent_publicip>:<port>] | comp=IoTAgent
iotstack_agent-json.1.xyz@xerus-1 | time=2018-10-18T09:02:33.976Z | lvl=DEBUG | corr=8d2864ec-d2b4-11e8-b445-02420aff0161 | trans=de5680e7-0727-4577-ac44-ddeb59df1f31 | op=IoTAgentNGSI.GenericMiddlewares | srv=lmobile | subsrv=/lmobile_Industry | msg=Body:
iotstack_agent-json.1.xyz@xerus-1 |
iotstack_agent-json.1.xyz@xerus-1 | {
iotstack_agent-json.1.xyz@xerus-1 | "contextElements": [
iotstack_agent-json.1.xyz@xerus-1 | {
iotstack_agent-json.1.xyz@xerus-1 | "type": "Device",
iotstack_agent-json.1.xyz@xerus-1 | "isPattern": "false",
iotstack_agent-json.1.xyz@xerus-1 | "id": "t3",
iotstack_agent-json.1.xyz@xerus-1 | "attributes": [
iotstack_agent-json.1.xyz@xerus-1 |

iotstack_agent-json.1.xyz@xerus-1 | ]
iotstack_agent-json.1.xyz@xerus-1 | }
iotstack_agent-json.1.xyz@xerus-1 | ],
iotstack_agent-json.1.xyz@xerus-1 | "updateAction": "UPDATE"
iotstack_agent-json.1.xyz@xerus-1 | }
iotstack_agent-json.1.xyz@xerus-1 |
iotstack_agent-json.1.xyz@xerus-1 | | comp=IoTAgent
iotstack_agent-json.1.xyz@xerus-1 | time=2018-10-18T09:02:33.978Z | lvl=DEBUG | corr=8d2864ec-d2b4-11e8-b445-02420aff0161 | trans=de5680e7-0727-4577-ac44-ddeb59df1f31 | op=IoTAgentNGSI.DomainControl | srv=lmobile | subsrv=/lmobile_Industry | msg=response-time: 6 | comp=IoTAgent

Here I don't see warnings or errors but no commands are forwarded to the MQTT Broker on any topic (I'm subscribed both to the specific topic for commands /<apikey>/t3/cmd and to all topics by using the wildcard #).