Merge "HearingAid: set playback_started to true when start audio command finish."

                << ", audio type=" << loghex(start[2])

                << ", device=" << device->address

                << ", other side streaming=" << loghex(start[4]);

      device->playback_started = true;

      device->command_acked = false;

      BtaGattQueue::WriteCharacteristic(device->conn_id,

                                        device->audio_control_point_handle,

                                        start, GATT_WRITE, nullptr, nullptr);

      BtaGattQueue::WriteCharacteristic(

          device->conn_id, device->audio_control_point_handle, start,

          GATT_WRITE, HearingAidImpl::StartAudioCtrlCallbackStatic, nullptr);

    }

  }

  static void StartAudioCtrlCallbackStatic(uint16_t conn_id,

                                           tGATT_STATUS status, uint16_t handle,

                                           uint16_t len, const uint8_t* value,

                                           void* data) {

    if (status != GATT_SUCCESS) {

      LOG(ERROR) << __func__ << ": handle=" << handle << ", conn_id=" << conn_id

                 << ", status=" << loghex(static_cast<uint8_t>(status));

      return;

    }

    if (!instance) {

      LOG(ERROR) << __func__ << ": instance is null.";

      return;

    }

    instance->StartAudioCtrlCallback(conn_id);

  }

  void StartAudioCtrlCallback(uint16_t conn_id) {

    HearingDevice* hearingDevice = hearingDevices.FindByConnId(conn_id);

    if (!hearingDevice) {

      LOG(ERROR) << "Skipping unknown device, conn_id=" << loghex(conn_id);

      return;

    }

    LOG(INFO) << __func__ << ": device: " << hearingDevice->address;

    hearingDevice->playback_started = true;

  }

  void OnAudioDataReady(const std::vector<uint8_t>& data) {