get/send values to the ac

[Kiter1988]

Hello,
I connected the arduino to my AC (SRK 35 ZS), the light on the esp is on.
It send a connection-message to my broker, every 6 minutes. I visulize it with mqtt.fx
I send help to the device and it sends {"metrics":[],"seq":0} back, if i change the "payload decoder".
How can i send some commands to my ac, can you make me an example ?

Only the debug message comes back, nothing else. is that normal ?
I subscribe it all (#)

Im a beginner in this case.