function to open serial port and listen to messages. be sure to set correct port and baud rate.

serial_rx.py

import serial

def listen_serial(port, baud_rate):
    try:
        ser = serial.Serial(port, baud_rate)
        print(f"Opened {port} with baud rate {baud_rate}")
        
        while True:
            # Read data from the serial port
            if ser.in_waiting > 0:
                line = ser.readline().decode('utf-8').rstrip()
                print(line)
                
    except serial.SerialException as e:
        print(f"Error opening or using the serial port: {e}")
    except KeyboardInterrupt:
        print("Program terminated by user.")
    finally:
        if ser.is_open:
            ser.close()
            print("Closed the serial port.")

def main():
    port = '/dev/ttyACM0'
    baud_rate = 9600
    listen_serial(port, baud_rate)

if __name__ == "__main__":
    main()