ESP8266 Community Forum

Is the combination of both also possible :
- swapping UART0 : TX0 GPIO 1 and RX0 GPIO 3 to GPIO15 (TX) and GPIO13 (RX)
- remapping UART1 TX pin GPIO 2 to pin GPIO 1 ? ( so UART1 uses the USB chip)

So here I would use the (4) pin set from UART0 for both UARTs

Why I would do this :
- need to use a hardware serial port to read (only) incoming data at 115200 (@ 3.3V)
- like to use the build-in USB chip to monitor to computer (only data out from ESP8266 to PC )

Unfortunately not; this is one of the lesser handy properties of the ESP8266.



The ESP8266 doesn't support remapping, only swapping (using the functions in the table above); the ESP32, however, does support remapping and even has three UART controllers.

You can swap UART0 from (TX/RX) GPIO1/3 to GPIO15/13, but of UART1 only TX (GPIO2) can be used, since the GPIO for RX is used by the flash memory and cannot be swapped.

For a more in-depth description, please read this topic in the Arduino-ESP8266 reference manual.

This delay problem comes with every Serial command .... why don't they just fix it in the library ??? Simply add polling or interrupt to check for serial data.