Well, that's perfectly obvious. To you.
It is cause its the payload.
The topic says MQTT so this is about the Arduino pubsubclient.
But it sure doesn't have to have the meaningless name "callback".
It is not meaningless if you know MQTT in conjunction with Arduino cause it's part of
the pubsubclient (Arduino client for MQTT).
And everything is working great. Switching house lights, TV programs, Doorbell ring through Asterisk over VoIP
to Softphones, 1-Wire sensor logging to MariaDB....
I only can't get this stupid loop stop to work.
I do it with voice commands.
The idea was if i say "TV volume up" that the Arduino sends the IR signal until i say "volume stop".
Volume up works but i can't stop it.
The server sends payload "volume-up" to the Arduino and runs it and it's working.
But if i send then the payload "volume-stop" it does not stop running "volume-up".
If i check my "int test" after sending "volume-stop" it's set to "1" but does not effect the running "volume-up" loop.