Mouse not detected.

Hi Ather, thanks for your question about using TinyPilot with your Bluetooth device.

The configuration you've described isn't one we've seen before, so we'll need to investigate this issue. Can you please provide the adapter's make and model as a starting point? Can you please also send me a link to your debug logs (while the adapter is connected) by going to System, then Logs, then Get Shareable URL?

@cghague I managed to get it partially working by using relative positioning with HID and making some updates to mouse.py. My understanding of this is still somewhat limited, though. It doesn’t work as smoothly as absolute positioning, but it’s a good starting point.

HID Descriptor for mouse:
/opt/tinypilot-privileged/init-usb-gadget

echo 5 > "${USB_MOUSE_FUNCTIONS_DIR}/report_length"
# Write the report descriptor
D=$(mktemp)
{
echo -ne \\x05\\x01      # USAGE_PAGE (Generic Desktop)
echo -ne \\x09\\x02      # USAGE (Mouse)
echo -ne \\xA1\\x01      # COLLECTION (Application)
                                         #   8-buttons
echo -ne \\x05\\x09      #   USAGE_PAGE (Button)
echo -ne \\x19\\x01      #   USAGE_MINIMUM (Button 1)
echo -ne \\x29\\x08      #   USAGE_MAXIMUM (Button 8)
echo -ne \\x15\\x00      #   LOGICAL_MINIMUM (0)
echo -ne \\x25\\x01      #   LOGICAL_MAXIMUM (1)
echo -ne \\x95\\x08      #   REPORT_COUNT (8)
echo -ne \\x75\\x01      #   REPORT_SIZE (1)
echo -ne \\x81\\x02      #   INPUT (Data,Var,Abs)
                                         #   x,y absolute coordinates
echo -ne \\x05\\x01      #   USAGE_PAGE (Generic Desktop)
echo -ne \\x09\\x30      #   USAGE (X)
echo -ne \\x09\\x31      #   USAGE (Y)
echo -ne \\x15\\x81      #   LOGICAL_MINIMUM (-127)
echo -ne \\x25\\x7F      #   LOGICAL_MAXIMUM (127)
echo -ne \\x75\\x08      #   REPORT_SIZE (8)
echo -ne \\x95\\x02      #   REPORT_COUNT (2)
echo -ne \\x81\\x06      #   INPUT (Data,Var,Rel)
                                         #   vertical wheel
echo -ne \\x09\\x38      #   USAGE (wheel)
echo -ne \\x15\\x81      #   LOGICAL_MINIMUM (-127)
echo -ne \\x25\\x7F      #   LOGICAL_MAXIMUM (127)
echo -ne \\x75\\x08      #   REPORT_SIZE (8)
echo -ne \\x95\\x01      #   REPORT_COUNT (1)
echo -ne \\x81\\x06      #   INPUT (Data,Var,Rel)
                                         #   horizontal wheel
echo -ne \\x05\\x0C      #   USAGE_PAGE (Consumer Devices)
echo -ne \\x0A\\x38\\x02 #   USAGE (AC Pan)
echo -ne \\x15\\x81      #   LOGICAL_MINIMUM (-127)
echo -ne \\x25\\x7F      #   LOGICAL_MAXIMUM (127)
echo -ne \\x75\\x08      #   REPORT_SIZE (8)
echo -ne \\x95\\x01      #   REPORT_COUNT (1)
echo -ne \\x81\\x06      #   INPUT (Data,Var,Rel)
echo -ne \\xC0               # END_COLLECTION
} >> "$D"

/opt/tinypilot/app/hid/mouse.py

from hid import write as hid_write

# Global variables to store the previous mouse coordinates
_last_x = None
_last_y = None

# Sensitivity multiplier: adjust this value to increase/decrease movement
SENSITIVITY_MULTIPLIER = 1250  # Experiment with this value

def send_mouse_event(mouse_path, buttons, current_x, current_y, vertical_wheel_delta, horizontal_wheel_delta):
    x, y = _scale_mouse_coordinates(current_x, current_y)

    buf = [0] * 5
    buf[0] = buttons
    buf[1] = x & 0xff
    buf[2] = y & 0xff
    buf[3] = vertical_wheel_delta & 0xff
    buf[4] = horizontal_wheel_delta & 0xff
    hid_write.write_to_hid_interface(mouse_path, buf)

def _scale_mouse_coordinates(current_x, current_y):
    global _last_x, _last_y
    if _last_x is None or _last_y is None:
        # First event, assume no movement.
        delta_x = 0
        delta_y = 0
    else:
        delta_x = current_x - _last_x
        delta_y = current_y - _last_y

    _last_x, _last_y = current_x, current_y

    # Multiply the difference by the sensitivity multiplier.
    x = int(delta_x * SENSITIVITY_MULTIPLIER)
    y = int(delta_y * SENSITIVITY_MULTIPLIER)

    # Clip values to ensure they're within the expected range (-127 to 127).
    x = max(-127, min(127, x))
    y = max(-127, min(127, y))
    return x, y
    
def _translate_vertical_wheel_delta(vertical_wheel_delta):
    # In JavaScript, a negative wheel delta number indicates upward scrolling,
    # but in HID, negative means downward scrolling, so we negate the value to
    # translate from JavaScript semantics to HID semantics.
    return vertical_wheel_delta * -1