HarmonyOS ble蓝牙接收数据如何实现同步操作

前暂未提供同步方法能力获取参数能力，可考虑通过async…await修饰将异步回调转换成同步形式在监听事件中获取：

if (this.gattClient) {
  this.gattClient.on('BLEConnectionStateChange', async (state: ble.BLEConnectionChangeState) => {
    console.log('BluetoothPage bluetooth connect state changed');
    let deviceId = state.deviceId;
    console.log('BluetoothPage deviceId connectState ' + deviceId);
    this.connectState = state.state;
    if (this.connectState == constant.ProfileConnectionState.STATE_DISCONNECTED) {
      this.connectStateSwitch = false;
    }

    if (this.connectState == constant.ProfileConnectionState.STATE_CONNECTED) {
      this.connectStateSwitch = true;
    }
    console.log('BluetoothPage bluetooth connectState ' + JSON.stringify(this.connectState));
  })
  this.stateListenSwitch = true;
}