code: func AdvertiseIBeacon(ctx context.Context, u UUID, major, minor uint16, pwr int8) error {
  	if defaultDevice == nil {
  		return ErrDefaultDevice
  	}
  	defer untrap(trap(ctx))
  	return defaultDevice.AdvertiseIBeacon(ctx, u, major, minor, pwr)
  }
docs: // AdvertiseIBeacon advertises iBeacon with specified parameters.