MQTT with non-json payload

Just the three shown in that list or many more?

  • If it’s just three, you can use the first strategy described here (don’t be dissuaded by its reference to Sonoff RF Bridge; its applicable for cases where the received data contains information intended for multiple entities).
  • If it’s many more, you’re better off employing the second strategy described in the linked post (i.e. creating a simple ‘demultiplexer’ automation).