js

async function setDeviceColor(usbDevice, r, g, b) {
  if (device.opened) {
    // This hypothetical USB device requires that the data passed to
    // it be in a Uint8Array.
    const payload = new Uint8Array([r, g, b]);

    await usbDevice.controlTransferOut(
      {
        requestType: "vendor",
        recipient: "device",
        request: 1,
        value: 0,
        index: 0,
      },
      payload,
    );
  }
}