Managed to get my CO2-Sensor working with C# and Raylib. Made a little LCARS Interface. I did that with Pygame last Winter, but I wanted to get it working with a more familiar language, and a general HID-Library. I’m not sure why all of this works, but you have to send a feature report first, then it’s possible to read out values from the sensor. The next steps may be to remove the device listening-loop from the Raylib rendering loop, to get a non-blocking UI.