HarmonyOS 蓝牙ble模块getServices失败？

Question

使用蓝牙ble模板及进行getServices操作，报错如下[bluetooth\_gatt\_client.cpp(DiscoverServices:621)]Request not supported，[nodict][napi\_bluetooth\_utils.cpp(GetCallbackErrorValue:35)]errCode: 2900099

//代码
gattClientDevice = ble.createGattClientDevice(deviceId);
gattClientDevice.connect();
try {
  gattClientDevice.getServices((code: BusinessError, gattServices: Array<ble.GattService>) => {
    if (code.code == 0) {
      let services = gattServices;
      let serviceId = '';
      console.log('bluetooth code is ' + code.code);
      console.log('bluetooth services ', services);
      for (let index = 0; index < services.length; index++) {
        console.log((index + 1) + ' 服务ID：' + services[index].serviceUuid + ' 主服务：' + services[index].isPrimary);
        const element = services[index];
        let uuid = element.serviceUuid;
        if (uuid.toLocaleUpperCase().indexOf(MkdPrinterConfigurations.defaultServiceUUID.iBridgeServiceUUID) > -1 ||
          uuid.toLocaleUpperCase().indexOf(MkdPrinterConfigurations.defaultServiceUUID.ShangHaiBTServiceUUID) > -1 ||
          uuid.toLocaleUpperCase().indexOf(MkdPrinterConfigurations.defaultServiceUUID.EspRessifServiceUUID) > -1) {
          serviceId = uuid;
          break;
        }
      }
      console.log('发现服务成功');
      // 重置成功回调
      let newSuccessCallback = () => {
        MkdPrinterParams.self.printerPropertyParams.serviceId = serviceId;
        printParams.serviceId = serviceId;
        successCallback && successCallback();
      };
      // 开始发现特征值
      startDiscoverCharacteristics(serviceId, newSuccessCallback, failCallback);
    }
  });
} catch (err) {
  console.error("服务发现", err)
  newFailCallback(err)
}

Answer 1

试一下先监听连接状态，连接已成功，回调返回状态值STATE\_CONNECTED时再调用getServices接口。