FWIW, I was able to add OTA to my ESP32 app very easily. I already had a WiFIServer instance anyway for RESTful commands so I added one called /update . It expects a POST command sent with curl as follows: curl -H "Content-Type: application/octet-stream" --data-binary @$BINFILE "http://PowerMeter.lo...

I have a very similar situation. I am reading ADC3 with interrupt at 500 Hz (once every 2 ms). Normally it is very stable but roughly every 10-15 minutes there is a sudden change in the interrupt period about 1 ms that lasts for 10-20 ms then it disappears again. I can determine no external reason f...