@feld I know that *can* :-D The question is about making sure nothing automagic *can* try to load or even access any kernel module, e.g. it should not identify as a HID or storage, etc. For that it should ideally have a VID/PID combo that is reserved for that use (Essentially a Null-Implementation). I'm just curious whether someone actually makes such a thing, e.g. as a dongle, or has figured out a microcontroller with the absolute minimum of intelligence for it and published that finding.