I'm a new Ardunio user..
I have 2 Arduino and I would like to make a serial connection between them
by using TX and RX ports
In addition, I would to authentication this communication between them by using SHA265 (Crypto Library )
if you have any good resources, please help me with it.
My Enquiry is After I upload the sender and receiver code. then I upload anything else.
is it erasing the previous configuration?
I mean should I put all configurations that I need together in one file and upload once?