I like to make an automation that gives a notification on whatsapp, if there is no mqtt sensor update for more then 30 minutes.
The sensor is sending every 15min the current value. Most of the time it is the same value. So I don’t know if the sensor is down or not.
The whatsapp notification works already, but I don’t find a way to test the mqtt sensor update past time.
Is this possible to do?
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