Zigbee2MQTT: Cannot get my relay working

Setup, Configuration and Use Installation
1
  • Platform information:
    • Hardware: RPi 3b+
    • OS:
    • Java Runtime Environment: 17
    • openHAB version: 4

I am in the process of changing from OpenHAB Zigbee binding to MQTT and Zigbee2MQTT, to be able to use a wider range of devices. Steep learning curve, so far.
I have a MHCOZY 4-channel relay (MHCOZY TYWB 4ch-RF control via MQTT | Zigbee2MQTT). It worked under the Zigbee binding. Under Z2M I have created a Thing for the device, and Channel and Item for the first of the relays (so far).
OpenHAB has contact with the relay. When I manually swich the relay ON or OFF, this is reflected in OpenHAB. The problem is, I have not found out how to control the relay from OpenHAB.
Using the information on the abovementioned web page, I have set up the channel like this:

UID: mqtt:topic:ccb86d30dd:ReleX4
label: ReleX4
thingTypeUID: mqtt:topic
configuration: {}
bridgeUID: mqtt:broker:ccb86d30dd
channels:
  - id: Hovedtermostat
    channelTypeUID: mqtt:switch
    label: Hovedtermostat
    description: ""
    configuration:
      commandTopic: zigbee2mqtt/0xa4c138aa03efa9de/set
      stateTopic: zigbee2mqtt/0xa4c138aa03efa9de/state_l1
      off: '{"state_l1": "OFF"}'
      on: '{"state_l1": "ON"}'

Things look right in MQTT Explorer, but no switching takes place. And I am stuck.

Any ideas?

2

Try the below for the commandTopic mapping

      off: OFF
      on: ON
3

I don’t think so. Then you wouldn’t have any way to distinguish between the four diffrernt relays (the “set” topic is on the thing level, not channel level)

4

You need to create separate channels for each switch. See below as an example for a device with multiple switches

bridgeUID: mqtt:broker:DockerMQTT
channels:
  - id: switch1
    channelTypeUID: mqtt:switch
    label: Switch 1
    description: null
    configuration:
      commandTopic: zigbee2mqtt/Bedroom_Lidl_powerstrip/l1/set
      stateTopic: zigbee2mqtt/Bedroom_Lidl_powerstrip/state_l1
      off: OFF
      on: ON
  - id: switch2
    channelTypeUID: mqtt:switch
    label: Switch 2
    description: null
    configuration:
      commandTopic: zigbee2mqtt/Bedroom_Lidl_powerstrip/l2/set
      stateTopic: zigbee2mqtt/Bedroom_Lidl_powerstrip/state_l2
      off: OFF
      on: ON
  - id: switch3
    channelTypeUID: mqtt:switch
    label: Switch 3
    description: null
    configuration:
      commandTopic: zigbee2mqtt/Bedroom_Lidl_powerstrip/l3/set
      stateTopic: zigbee2mqtt/Bedroom_Lidl_powerstrip/state_l3
      off: OFF
      on: ON
5

Yes, I know I must have one channel per relay. I only finished the first one.
The problem is, as I understand the doc, my device has one common “set” topic for all the relays. In your example, there is a differnt topic for each, which is a different scenario.
Anyway, to be sure, I tried the syntax you sent. It did not work :disappointed_relieved:

6

In your configuration.yaml what is your output set to.


  output: attribute

With it set it will separate them out. The example I gave was for this device.

What is mqttexplorer outputting?

7

Yes, now we are talking! That made the trick!
Thanks a lot for your patience with me! :slight_smile:

8

No problem.

Another tip that you might not know. There is a frontend

9

and if course a big repository for all kinds of zigbee devices:

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