HID: Error: Error: ERR 0x8 (INVALID_STATE) (:3068)

So, I am trying to adjust
https://banglejs.com/apps/?id=hidcam
for Bangle.js 2

Now, I come to the error

Error: Error: ERR 0x8 (INVALID_STATE) (:3068)

with this piece of code:

    try {
      NRF.sendHIDReport([0,code], () => { // <---- Error comes here
        NRF.sendHIDReport([0,0], () => {
          if (cb) cb();
        });
      });
    } catch(e) {
      print(e);
    }

Any idea?

Got the same with the original https://banglejs.com/apps/?id=hidmsicswi­pe. So I think I just have a misconfigured bluetooth on my Android. The Watch is showing HID=Kbrd+Media in settings, but Android Bluetooth settings only show "Input device". Is that normal?