I need to send/receive small files (a few hundreds bytes at most) by serial interface with another device. Is there any python library to do this easily?
To read bytes by serial you can use the UART class: https://docs.micropython.org/en/latest/library/machine.UART.html
However, I’m not sure if it is suitable for your application.
I saw it but they say “Availability: WiPy”: I have a node MCU 8266.
It seems strange to me that noone needed such a basic function and no general purpose serial com library exists.
Have a nice day.