Udev-rule failed for me

[xeor]

For some reason, the udev rule in the doc SUBSYSTEM=="usb", ATTRS{idVendor}=="2516", MODE="0666" was not sufficient on my setup. It did not allow my user to use this lib.
libcmmk was trying to use the /dev/hidraw* file, which still had perm 600.

Adding an udev-rule like this fixed my issue: SUBSYSTEM=="hidraw", ATTRS{idVendor}=="2516", MODE="0666"

I'm on manjaro/arch.