When I say "lose autodection", that means "plug in a device, it automatically gets polled". You could still manually add a device (like /dev/ttyACM0), and you'd still get the cool capability + schema autodetection/negotiation stuff I'd work on. You just wouldn't have nice hotplug support.

I'd been meaning to look at postcard-rpc. I know we'd talked about the schema hashing, but interested to see how it works in practice. So far it's looking pretty exciting. Since the PC is going to see a UART bridge, device ID matching would work. Question is if we can change the existing protocol.