Unable to open HID Device (with solution)

[Ryuno-Ki]

Today I finally could set aside some time to test the demo website using my Wii MotionPlus!

I struggled a bit on Linux using Chromium, so let me explain how I eventually managed to solve it:

Pairing via Bluetooth

For some reason, Bluetooth wasn't shown in my Network Manager applet nor in Mate's Control Center.
Using Bluedevil offered me a GUI to connect (PIN remains empty) while clicking the Sync button on the rear side of the device. Another option might be hitting 1 + 2 on the Wii Motion at the same time?

Using BlueZ' sudo bluetoothctl did not allow me to do so.
I had a hard time getting the Nintendo device to show up. (XWiimote lists other alias names for Wii Motion devices).

Connecting via HID

Once paired, I could pick the device from the Chromium prompt to connect.

However, I noticed a DOMException that the device was not able to open (on your call to .open() - perhaps worth to show an UI error?).

Resolution

After debugging for a few hours, I finally realised that I could sudo chmod 0606 /dev/hidraw0 to grant read AND write access. chrome://device-log/ was helpful in pointing me towards missing write access.

Remaining issues

I could read the Accelerometer values and the button presses. LEDs can blink and vibrate works.
I couldn't figure out, though, what to do with the canvas (shows up black here). From reading the code, it ought to show white dots? How am I suppose to create those?
Do you know, whether Gyroscope data is available, too?

[PicchiKevin]

Massive thanks for sharing your experience using the lib.
I'll try to integrate this in a troubleshoot section.

About the remaining issues, once connected you should be able to go on the extended mode and select Core Buttons + Accelerometer + IR, which should after a few seconds display the IR dots on the canvas.

There is a way to get gyroscope data but I haven't integrated yet in the library. (requires to send some packets data to the Wiimote to enable it more info here)

[Ryuno-Ki]

There is a way to get gyroscope data but I haven't integrated yet in the library.

I'm happy to test this once it's part of the library.