MQTT in OH3, things offline, items do not refresh

Setup, Configuration and Use Migration
1

Hello, I’m fighting 3rd day with migration from OH2.5 to OH3. As not everything was working properly after just update, I’ve decided to make all from scratch. I am struggling now with MQTT and zigbee integration.
In general, I was following this tutorial.
Shortly what was done:

  1. Installed Mosquito by openhab -config
  2. Installed Zigbee2MQTT and running properly, devices paired
  3. Installed MQTT broker, paired.
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When I add generic MQTT thing it stays constantly offline in OH3 despite the fact I have set up everything according to manual mentioned on the beginning.

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UID: mqtt:topic:MyMQTTBroker:c392eafebe
label: Generic MQTT Thing
thingTypeUID: mqtt:topic
configuration:
  payloadNotAvailable: offline
  availabilityTopic: zigbee2mqtt/SensorDzieci/availability
  payloadAvailable: online
bridgeUID: mqtt:broker:MyMQTTBroker
location: Dzieci
channels:
  - id: Temperature
    channelTypeUID: mqtt:number
    label: Temperatura
    description: ""
    configuration:
      stateTopic: zigbee2mqtt/SensorDzieci/temperature
      min: 0.02

Also added channel and linked with item is not refreshing.
In Zigbee2mqtt I can see changes properly:

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Probably I’ve made some stupid mistake. I was trying to search similar topics on forum but nothing helped. I would be really grateful for help.

Best Regards
Robert

2

Are you sure that your device is sending these payloads in the first place via zigbee2mqtt? I understand that some devices don’t/won’t have an availability topic…

3

You are right. They are not sending this in that way, I wasn’t aware that it is needed. MQTT is not well understandable for me, starting to catch up.
So, how can I check status of zigbee device in that way? I remember that in OH2.5 with txt added things, they were showing their status correctly.

4

Well, if you don’t have an availability topic then you would never had that status shown correctly. Note that the Thing Online/Offline does not mean your device is online/offline - it just means that the openHAB Generic MQTT Thing is correctly connected via the openHAB Broker Thing to your MQTT broker.

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