Nice! The raw-usb interface works perfectly for the GameCube Controller Adapter.
Do you know if this new hotplug interface is on the immediate roadmap, or does it still need a design to be thought up? I wasn’t able to find anything regarding it on the snapd roadmap page.
Also is there a way for the snap to automatically set up the udev rules, rather than getting the user to place them in /etc/udev/rules.d ? I had a look at this forum post and it sounded like the best way would be to add them to the backend of an appropriate interface in order to be done within the snap ecosystem? How to add or workaround a udev rule