MQTT not showing values in openhab

Setup, Configuration and Use Beginners
1

I have an ESP8266 with esp easy installed which delivers mqtt data like temperature and humidity to my mosquitto broker on a raspberry. On this rasp there is also openhab installed. I can see that my mqtt messages from my esp8266 arrive.

tail -f /var/log/mosquitto/mosquito.conf
1740407003: Received PUBLISH from wohnzimmer_1 (d0, q0, r0, m0, ‘/wohnzimmer_1/BMx280/Temperature’, … (4 bytes))
1740407003: Sending PUBLISH to wohnzimmer_1 (d0, q0, r0, m0, ‘/wohnzimmer_1/BMx280/Temperature’, … (4 bytes))
1740407003: Received PUBLISH from wohnzimmer_1 (d0, q0, r0, m0, ‘/wohnzimmer_1/BMx280/Humidity’, … (3 bytes))
1740407003: Sending PUBLISH to wohnzimmer_1 (d0, q0, r0, m0, ‘/wohnzimmer_1/BMx280/Humidity’, … (3 bytes))

I created a Thing an Item and linked them together. Unfortunately I can’t see the temperature value but only a NULL in openhab. Why does my temperature not arrive in openhab?

The Code looks like this

UID: mqtt:topic:MQTTBroker:WohnzimmerMeasurements
label: Wohnzimmer Measurements
thingTypeUID: mqtt:topic
configuration: {}
bridgeUID: mqtt:broker:MQTTBroker
channels:

  • id: WohnzimmerTemperature
    channelTypeUID: mqtt:number
    label: Wohnzimmer Temperature
    description: “”
    configuration:
    stateTopic: wohnzimmer_1/BMx280/Temperature

Thank you very much for your help.

Greetings Manuel

2

The broker doesn’t get channels. Need to add a generic Mqtt thing that references the broker.

3

If your topic starts with a slash (this was the default on older ESPEasy firmware builds), you need to add that slash also to your stateTopic.

stateTopic: /wohnzimmer_1/BMx280/Temperature

4

Many thanks to all. I could fix it it was the missing / in front of the stateTopic.

/wohnzimmer_1/BMx280/Temperature

is correct.

Greetings Manuel