Raihaan wrote:https://dzone.com/articles/debugging-arm-cores-with-ip-based-debug-probes-and
On this tutorial, the RX/TX output is 5V - how can the ESP8266 handle it?
I couldn't find anything with an ESP8266 from that link. Could you update it if it has changed?
I have powered the ESP-12E with 5 volts (accidentally) and it worked. But just because it worked doesn't mean it is good for the device. I'm sure there are people that use it that way and it does work for them. But I wouldn't risk doing it since it doesn't take much to lower the 5 volt TX level to 3.3 volts.
I have done resistive level shifting this way, and sent the 3.3 volt TX signal into a 5 volt microcontroller TX input. It worked for some units but it was marginal. We had a production run and I had to put in a level translator to give the 5 volt logic what it needed.