Every time he would try to upload, he would get the dreaded avrdude error, ‘stk500_getsync(): not in sync ... pins of the Arduino. Sending a short message through the serial port showed the ...

In it, he shows an example of using all three ESP32 UARTs from an Arduino program. He calls the third port “secret” although that’s really a misnomer. However, it does require a quick patch ...