Anyone try using the puck as a USB HID Joystick?

Ok - I have some incremental progress. Below is my modified js for the puck. I'm testing it in OpenEmu on my Mac. The puck shows up as a joystick (sometimes as 'unknown' and sometimes as 'Puck.js 80b6'). Once I got Y axis analog input triggering, but no buttons and nothing on the x axis.

I also still get the message "BLE Connected, queueing BLE restart for later" in the IDE, but I seem to always get that even when using the BLE Keyboard HID. I've pretty aggressively been disconnecting the puck from bluetooth after flashing it with my program, so I think the bluetooth stack is automatically restarting in HID mode (which seems to be reflected in the device showing up in OpenEMU's joystick list). That said, my workflow could still be wrong here.

Anyway, let me know if you spot anything obviously incorrect. Thx again!

//https://github.com/espruino/BangleApps/blob/master/apps/boot/hid_info.txt
var joystick_report = new Uint8Array([
  0x05, 0x01,       // Usage Page (Generic Desktop)
  0x09, 0x04,       // Usage (Joystick)
  0xA1, 0x01,       // Collection (Application)
	0x09, 0x01,       // Usage (Pointer)
	0xA1, 0x00,       // Collection (Physical)
  // Buttons
  0x05, 0x09,       // Usage Page (Buttons)
  0x19, 0x01,       // Usage Minimum (1)
  0x29, 0x05,       // Usage Maximum (5)
  0x15, 0x00,       // Logical Minimum (0)
  0x25, 0x01,       // Logical Maximum (1)
  0x95, 0x05,       // Report Count (5)
  0x75, 0x01,       // Report Size (1)
  0x81, 0x02,       // Input (Data, Variable, Absolute)

  // padding bits
  0x95, 0x03,       // Report Count (3)
  0x75, 0x01,       // Report Size (1)
  0x81, 0x03,       // Input (Constant)

  // Stick
  0x05, 0x01,       // Usage Page (Generic Desktop)
  0x09, 0x30,       // Usage (X)
  0x09, 0x31,       // Usage (Y)
  0x15, 0x81,       // Logical Minimum (-127)
  0x25, 0x7f,       // Logical Maximum (127)
  0x75, 0x08,       // Report Size (8)
  0x95, 0x02,       // Report Count (2)
  0x81, 0x02,       // Input (Data, Variable, Absolute)
	0xC0,              // End Collection (Physical)
  0xC0              // End Collection (Application)
]);

NRF.setServices(undefined, { hid : joystick_report });

Puck.accelOn(); // default is 12.5Hz, with gyro

var sendInProgress = false; // Only send one message at a time, do not flood
const sendHid = function (x, y, btn1, btn2, btn3, btn4, btn5, cb) {
  try {
    const buttons = (btn5<<4) | (btn4<<3) | (btn3<<2) | (btn2<<1) | (btn1<<0);
    if (!sendInProgress) {
      sendInProgress = true;
      print ([buttons, x, y]);
      NRF.sendHIDReport([buttons, x, y], () => {
        sendInProgress = false;
        if (cb) cb();
      });
    }
  } catch(e) {
    print(e);
  }
};

function update() {
  const btn1 = BTN1.read();
  const accel = Puck.accel();
  var x = accel.acc.x/128000;
  var y = accel.acc.y/128000;
  
  // rescale to approximately [-127:127]
  x *= 10;
  y *= 10;
  // I assume the joystick requires ints
  x = Math.floor( x * 127 );
  y = Math.floor( y * 127); 
  
  // check limits
  if (x > 127) x = 127;
  else if (x < -127) x = -127;
  if (y > 127) y = 127;
  else if (y < -127) y = -127;
  
  sendHid(x & 0xff, y & 0xff, btn1, false, false, false, false);
  //print ("x", x, "y", y, "btn1", btn1);
}

setInterval(update, 100); // 10 Hz