code: func (h *HCI) AdvertiseMfgData(id uint16, md []byte) error {
  	ad, err := adv.NewPacket(adv.ManufacturerData(id, md))
  	if err != nil {
  		return err
  	}
  	if err := h.SetAdvertisement(ad.Bytes(), nil); err != nil {
  		return nil
  	}
  	return h.Advertise()
  }
docs: // AdvertiseMfgData avertises the given manufacturer data.