Bluetooth devices nowadays have UserspaceHID enabled by default - since 2024-03~ apparently:

/etc/bluetooth/input.conf
# Enable HID protocol handling in userspace input profile
# Defaults to true (Use UHID instead of kernel HIDP)
#UserspaceHID=true

As a result, SC-controller does not recognize my BT connection on a v2 DS4 on my system as per #21 (comment) due to grabbing the HCI path which is not used, instead of the UHID one. Same issue is also in #13.

No clue how to fix this as I cannot figure out where syspath is taken from.

Here's the bastard.

Looks like we could do something like this?

https://github.com/libusb/hidapi/blob/master/linux/hid.c#L714-L728C9