i need to connect my ESP32 NodeMCU-32S ai thinker to other sensor via UART, to debug my UART code i connected ESP32 UART TX pin to ESP32 RX pin. when TX is short to RX the ESP32 Arduino IDE faield to connect but when i disconnect TX from RX Arduino IDE is connecting to the ESP32 board. this happen even when my code is only loop and setup.
RX - GPI03
TX - GPI01
do you have any suggestions how to solve the problem
RX and TX are used for the onboard USB controller (C02102) and in order to use UART one need to use P16 and P17 (GPIO16 and GPIO17)