[werk_ag]

... I am no specialist and a relative beginner in the Arduino field and do not feel like just random changes in code for trial and error. Would like some guidance here.

Hello,

I don't know what is your problem with OTA, but please don't start by launching doubts on the AQM-III code. I'm absolutely sure that OTA is working properly, not only for me but for many other users too.

If you are using Arduino IDE with a laptop with WiFi, connect it to your LAN by WiFi, then restart Arduino IDE. Sometimes this solves the problem of OTA devices not appear on Arduino IDE.

Here is a picture of three AQM devices being detected properly by the Arduino IDE.

   

Rgs.