Parameter "cbHost" of ServiceGroup class not working (should be called "cbroker")

[RCX112]

Describe the bug
I tried to create different devices and a single service group and wanted to change different attributes by publishing MQTT messages to the IoT Agent. The provisioning worked for me with no errors, but when I tried to change attribute values of my devices via MQTT nothing happened. When I changed the name of the attribute "cbHost" of the class "ServiceGroup" to "cbroker" everything worked for me.

[djs0109]

Thanks for your reporting! In order to reproduce your problem, could you share:

1. Your code regarding provisioning devices;
2. Version of IoTagent and Orion Context Broker?

[RCX112]

Sure! Regarding to the second point I checked the service health of my IoT Agent and it has the libVersion 3.4.0 and version 2.4.0. I also checked the Orion Context Broker, which has version 3.10.1.

Now about the first point: I first created my local environment using the Docker images from this repo: https://github.com/FIWARE/tutorials.IoT-over-MQTT.git . Afterwards I provisioned a service group and simple motion sensor device with the filip library:

from filip.models.ngsi_v2.iot import ServiceGroup, Device, DeviceAttribute
from filip.clients.ngsi_v2 import IoTAClient
from filip.models.base import FiwareHeader

fiware_header = FiwareHeader(service="openiot", service_path="/")

iota_client = IoTAClient(url="http://localhost:4041", fiware_header=fiware_header)

service_group = ServiceGroup(service="openiot",
                             subservice="/", apikey="4jggokgpepnvsb2uv4s40d59ov",
                             cbHost="http://localhost:1026", entity_type="Thing",
                             resource="")

motion_sensor_device = Device(service="openiot", service_path="/", device_id="motion001",
                              entity_name="urn:ngsi-ld:Motion:001", entity_type="Motion",
                              protocol="PDI-IoTA-UltraLight", transport="MQTT", timezone="Europe/Berlin",
                              attributes=[DeviceAttribute(object_id="c", name="count", type="Integer")])

iota_client.post_group(service_group, update=True)
iota_client.post_device(device=motion_sensor_device)

Here I used the parameter cbHost for my orion context broker. When I then publish an MQTT message like 'c|1' to change the count attribute of the device to the topic '/ul/4jggokgpepnvsb2uv4s40d59ov/motion001/attrs' nothing happens. But when I change the parameter "cbHost" to "cbroker" everything worked for me and the device attribute gets updated in the context broker.

[djs0109]

I think cbHost is the right parameter to used, see here. However, you should not specify it on the service group level, unless you want to override the cbHost on the container level.

I can reproduce your error, but I think you make some little mistakes while provisioning the service group, and device
I change your code a little bit, and it must also work for you.

service_group = ServiceGroup(apikey="4jggokgpepnvsb2uv4s40d59ov",
                             entity_type="Thing",
                             resource="/iot/ul")


motion_sensor_device = Device(device_id="motion002",
                              entity_name="urn:ngsi-ld:Motion:002",
                              entity_type="Motion",
                              protocol="PDI-IoTA-UltraLight",
                              transport="MQTT",
                              attributes=[DeviceAttribute(object_id="c", name="count", type="Integer")])

[github-actions]

Branch 204-Parameter-cbHost-of-ServiceGroup-class-not-working-should-be-called-cbroker created!

[RCX112]

This worked for me thanks 👍 It also works with resource="" for me :)