from time import sleep import serial INPUT_PORT = '/dev/ttyUSB1' OUTPUT_PORT = '/dev/ttyUSB0' dataInput = serial.Serial(INPUT_PORT, 115200, timeout=1) dataOutput = serial.Serial(OUTPUT_PORT, 115200, timeout=1) def lees(): line = dataInput.readline() dataOutput.write(line) def verzend(telegram): for line in telegram: print(line) dataOutput.write(line) sleep(1)