Update MQTT topic based on a sensor value

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

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