if i reboot the TX2, I have to reissue the command: sudo chmod 777 /dev/ttyUSB300
as it seems that it is no more available to all acount. do you know how to fix that?
Yes, you add a “, MODE=0666” rule to the udev rule that names the device ttyUSB300.
777 is not needed, because you won’t be running the serial device as an executable.