USB serial console

By default the controller opens a serial console on the USB interface, this is done by [email protected]. This systemd service can be disabled with systemctl disable gadget-getty@ttyGS0 to close of this interface, systemctl enable gadget-getty@ttyGS0 can be used to re-enable it.

Disabling this service hardens the security of the device as one can directly log into the root user this way, while that can be disabled over SSH. However in the absence of a network interface it is a very reliable way to get into the controller for configuration etc. Disable it at your own discretion.