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screenand try picocom. This is a small program (tiny compared toscreen) for accessing devices that provide serial consoles. It does only one thing but does it well; it does not try to emulate or multiplex terminals. I do not know whetherpicocomdefaults to the correct behavior, but it keeps you in control: see the options--noreset,--hangup,--lower-rts,--raise-rts,--lower-dtrand--raise-dtr.picocom /dev/ttyACM0communicate with Arduino over itsSerial.readand then "type-in file lorem.txt" and Arduino will get impression, that I am typing really fast really long texts. (the Serial.read will just receive lots of chars - the content of the file)picocom -b 115200 -s cat /dev/ttyUSB0works (-s cat) and then C-a C-s./test_serial.002.0200.s.x.hex