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I have recently tested it again. It works fine now. :)


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"The output I receive is serial test start ... What am I doing wrong?" You should use /dev/serial0 There seems to be nothing wrong with the program, it is probably doing what you instructed it to do i.e. Send a line; then read input and resend the characters over serial, presumably producing an infinite loop. What do you expect it to do? ...


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Try reconnecting serial device to find exact port. Refer https://www.instructables.com/Raspberry-Pi-Arduino-Serial-Communication/


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Use /dev/serial0 (rather than /dev/ttyS0).


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Hi this is how to solve this problem: import serial.tools.list_ports ports = list(serial.tools.list_ports.comports()) print(ports[0][0])


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