Update MQTT topic based on a sensor value

[johannes1702]

Hi,

I have connected HA to my MQTT broker. Connection works. As I want to use some information on another system, I want to write data from a HA sensor to the MQTT broker.

I have a sensor called

sensor.blitzortung_lightning_counter

which can assume a number of 0 and above. Now whenever it changes, I would like to write it into the MQTT topic

HA/lightning_counter

Is there any code which I can put into the configuration.yaml to do this? Can you help me with this?

Johannes

[Burningstone]

You need an automation for this, read the docs first here.
The trigger will be your sensor changing state and the action will be publishing the state to an MQTT topic.

[123 (Taras)]

Someone else asked a similar question and I posted an example here:

Post sensor values to MQTT

Correct. If you want to publish your RESTful sensor’s state to an MQTT topic, use an automation. - alias: 'Publish sensor value' trigger: platform: state entity_id: sensor.my_sensor action: service: mqtt.publish data_template: payload: "{{trigger.to_state.state}}" topic: whatever/topic/you/want If you want to publish the states of several sensors yet with only one automation, you could use something like this: - alias: 'Publish multiple sensor values' trigg…

[johannes1702]

Thank you both. What I have found after I created an automation, is mqtt_statestream, which does what I need and which also has a quite straight forward configuration.