Created question in FIWARE Q/A platform on 26-11-2022 at 11:11
Please, ANSWER this question AT https://stackoverflow.com/questions/74581683/i-cannot-properly-read-southbound-commands-through-orion-to-mqtt-devices

Question:
I cannot properly read Southbound commands through Orion to MQTT devices

Description:
I am trying to send commands in the Southbound direction following this flow:

The commands supported by the devices are provisioned as follows:
"services": [
{
"apikey": "5jggokgpepnvsb2uv4s40d59ov",
"cbroker": "'"http://orion:$ORION_PORT"'",
"entity_type": "Agv",
"transport": "MQTT",
"resource": "",
"commands": [
{
"object_id": "AGV_Alarm",
"name": "AGV_Alarm",
"type": "command",
"value":

{ "data": "metadata_for_AGV_Alarm" }

},
{
"object_id": "AGV_Event",
"name": "AGV_Event",
"type": "command",
"value":

{ "data": "metadata_for_AGV_Event" }

}
],

The request to send the command in the Southbound direction is made through the Orion Context Broker:
curl -iX PATCH \
'http://orion:1026/v2/entities/urn:ngsi-ld:Agv:001/attrs' \
-H 'Content-Type: application/json' \
-H 'fiware-service: openiot' \
-H 'fiware-servicepath: /' \
-d '{
"AGV_Event":

{ "type" : "command", "value": "152" }

}'

To simulate actuators the following tool is used which is listening for commands via MQTT:
docker run -it --rm --name mqtt-subscriber --network fiware_default efrecon/mqtt-client sub -h mosquitto -t "/5jggokgpepnvsb2uv4s40d59ov/agv001/cmd"

I can receive only a part of the payload of the command:
ubuntu@ip-172-31-85-246:~/FiwareDockerDevMode$ docker run -it --rm --name mqtt-subscriber --network fiware_default efrecon/mqtt-client sub -h mosquitto -t "/5jggokgpepnvsb2uv4s40d59ov/agv001/cmd"

{"AGV_Event":""} {"AGV_Event":""} {"AGV_Event":""}

In the temporary MongoDB, the command status appears as PENDING
AGV_Event_status: {
type: 'commandStatus',
creDate: 1669583822.6813245,
modDate: 1669584130.4993052,
value: 'PENDING',
mdNames: [
'TimeInstant'
],
md: {
TimeInstant:

{ type: 'DateTime', value: 1669584130.495 }

}
},
AGV_Event_info:

{ type: 'commandResult', creDate: 1669583822.6813245, modDate: 1669583822.6813245, value: ' ', mdNames: [] }

,

Update
If, on the other hand, I send the command according to the structure it has in MongoDB:
curl -iX PATCH \
'http://orion:1026/v2/entities/urn:ngsi-ld:Agv:001/attrs' \
-H 'Content-Type: application/json' \
-H 'fiware-service: openiot' \
-H 'fiware-servicepath: /' \
-d '{
"AGV_Event_info":

{ "type": "commandResult", "value": "200" }

,
"AGV_Event_status":

{ "type": "commandStatus", "value": "OK" }

}'

Now, nothing is received in the actuator simulator:
ubuntu@ip-172-31-85-246:~/FiwareDockerDevMode$ docker run -it --rm --name mqtt-subscriber --network fiware_default efrecon/mqtt-client sub -h mosquitto -t "/5jggokgpepnvsb2uv4s40d59ov/agv001/cmd"

However, the temporary MongoDB is updated properly:
AGV_Event_status:

{ type: 'commandStatus', creDate: 1669731581.9883916, modDate: 1669733857.6557434, value: 'OK', mdNames: [] }

,
AGV_Event_info:

{ type: 'commandResult', creDate: 1669731581.9883916, modDate: 1669733857.6557305, value: '200', mdNames: [] }

,

The official documentation of the IoTAgent-JSON suggests that when commands are sent in the Southbound direction the actuator will send a response, which would make sense considering that my actuators are dummies.
Any suggestions on how to receive all the information sent through the Orion Context Broker?