code: func (ble *BLE) StartAdvertising(name string, serviceUuids []xpc.UUID) {
  	uuids := make([][]byte, len(serviceUuids))
  	for i, uuid := range serviceUuids {
  		uuids[i] = []byte(uuid[:])
  	}
  	ble.sendCBMsg(8, xpc.Dict{"kCBAdvDataLocalName": name, "kCBAdvDataServiceUUIDs": uuids})
  }
docs: // start advertising