Sending commands to devices in FIWARE Orion is not working - fiware

Question

I am trying to provide a device on FIWARE and send commands. In my case, a lamp with commands ("on" and "off"). But, it's not working.
The steps to create a device and send command are:
Provide a device;
Create a service group;
Create a registration with commands;
Send a command.
I'm taking the fiware-tutorials following the steps, but don't work.
The code I have used was:
To create a device:
curl -iX POST \
'http://localhost:4041/iot/devices' \
-H 'Content-Type: application/json' \
-H 'fiware-service: openiot' \
-H 'fiware-servicepath: /' \
-d '{
"devices": [
{
"device_id": "lamp1",
"entity_name": "urn:ngsi-ld:Lamp:1",
"entity_type": "Lamp",
"protocol": "PDI-IoTA-UltraLight",
"transport": "HTTP",
"endpoint": "http://iot-sensors:3001/iot/lamp1",
"commands": [
{"name": "on","type": "command"},
{"name": "off","type": "command"}
],
"attributes": [
{"object_id": "s", "name": "state", "type":"Text"},
{"object_id": "l", "name": "luminosity", "type":"Integer"}
],
"static_attributes": [
{"name":"refStore", "type": "Relationship","value": "urn:ngsi-ld:Store:001"}
]
}
]
}
'
To create a service group:
curl -iX POST \
'http://localhost:4041/iot/services' \
-H 'Content-Type: application/json' \
-H 'fiware-service: openiot' \
-H 'fiware-servicepath: /' \
-d '{
"services": [
{
"apikey": "4jggokgpepnvsb2uv4s40d59ov",
"cbroker": "http://orion:1026",
"entity_type": "Thing",
"resource": "/iot/d"
}
]
}'
To create a registration for commands:
curl -iX POST \
'http://localhost:1026/v2/registrations' \
-H 'Content-Type: application/json' \
-H 'fiware-service: openiot' \
-H 'fiware-servicepath: /' \
-d '{
"description": "Lamp Commands",
"dataProvided": {
"entities": [
{
"id": "urn:ngsi-ld:Lamp:1","type": "Lamp"
}
],
"attrs": [ "on", "off" ]
},
"provider": {
"http": {"url": "http://orion:1026/v2"},
"legacyForwarding": true
}
}'
To send a "on" command:
curl -iX PATCH \
'http://localhost:1026/v2/entities/urn:ngsi-ld:Lamp:1/attrs' \
-H 'Content-Type: application/json' \
-H 'fiware-service: openiot' \
-H 'fiware-servicepath: /' \
-d '{
"on": {
"type" : "command",
"value" : ""
}
}'
Doing a HTTP get request to retrieve the entity:
curl -G -X GET \
'http://localhost:1026/v2/entities/urn:ngsi-ld:Lamp:1' \
-d 'type=Lamp' \
-d 'options=keyValues' \
-H 'fiware-service: openiot' \
-H 'fiware-servicepath: /'
I expect a output like:
{
"id": "urn:ngsi-ld:Lamp:001",
"type": "Lamp",
"TimeInstant": "2019-08-28T13:33:51.00Z",
"luminosity": "1115",
"off_info": " ",
"off_status": "UNKNOWN",
"on_info": " on OK",
"on_status": "OK",
"refStore": "urn:ngsi-ld:Store:001",
"state": "ON",
"on": "",
"off": ""
}
but I receive this:
{
"id": "urn:ngsi-ld:Lamp:1",
"type": "Lamp",
"TimeInstant": "2019-08-28T12:50:22.00Z",
"luminosity": " ",
"off_info": " ",
"off_status": "UNKNOWN",
"on_info": "There was an error in the response of a device to a command [404]: on NOT OK",
"on_status": "ERROR",
"refStore": "urn:ngsi-ld:Store:001",
"state": " ",
"on": "",
"off": ""
}

Answer 1

Assuming you are using the FIWARE Tutorial Dummy devices, then your provisioning steps are correct and the error message received (404) indicates that lamp1 is not responding to your command when sent.
When you are provisioning the device
"device_id": "lamp1",
"entity_name": "urn:ngsi-ld:Lamp:1",
"endpoint": "http://iot-sensors:3001/iot/lamp1",
You are stating that:
There exists a device (lamp1)
The device has an entity name in Orion (urn:ngsi-ld:Lamp:1)
The device is able to respond to commands on the url shown (http://iot-sensors:3001/iot/lamp1)
The final statement is incorrect.
The context-provider code sets up 4 dummy lamps:
lamp001
lamp002
lamp003
lamp004
But no lamp1 - therefore when an HTTP POST request is sent to http://iot-sensors:3001/iot/lamp1 the response is a 404 Not Found - which is correctly defined in your entity state in Orion.
BTW, #fgalan is entirely correct in stating that the registration is no longer necessary with more modern versions of the IoT Agents - it has been left in the tutorial purely for backwards compatibility with older versions.