code: func AdvertiseIBeaconData(ctx context.Context, b []byte) error {
  	if defaultDevice == nil {
  		return ErrDefaultDevice
  	}
  	defer untrap(trap(ctx))
  	return defaultDevice.AdvertiseIBeaconData(ctx, b)
  }
docs: // AdvertiseIBeaconData advertise iBeacon with given manufacturer data.