HarmonyOS鸿蒙Next中BLE在订阅特定UUID服务的特征值变化通知后，与耳机的连接断开

HarmonyOS鸿蒙Next中BLE在订阅特定UUID服务的特征值变化通知后，与耳机的连接断开

楼主在鸿蒙Next 5.0的手机上开发了一款蓝牙APP，目前可以成功用BLE连接Freebuds Pro4蓝牙耳机，并发现其所有服务的UUID。楼主进而订阅每个UUID的特征值变化通知，大部分UUID都能够成功订阅，但是有两个服务在订阅后耳机连接会断开，且不会报错。这两个服务的UUID特征值如下：

服务1：

{
  "characteristicUuid": "02000200-0000-2000-8000-009E78563412",
  "serviceUuid": "0000FD21-0000-1000-8000-00805F9B34FB",
  "characteristicValue": {},
  "properties": {
    "write": false,
    "writeNoResponse": false,
    "read": false,
    "notify": true,
    "indicate": false
  },
  "descriptors": [
    {
      "descriptorUuid": "00002902-0000-1000-8000-00805F9B34FB",
      "characteristicUuid": "02000200-0000-2000-8000-009E78563412",
      "serviceUuid": "0000FD21-0000-1000-8000-00805F9B34FB",
      "descriptorValue": {}
    },
    {
      "descriptorUuid": "00002901-0000-1000-8000-00805F9B34FB",
      "characteristicUuid": "02000200-0000-2000-8000-009E78563412",
      "serviceUuid": "0000FD21-0000-1000-8000-00805F9B34FB",
      "descriptorValue": {}
    }
  ]
}

服务2：

{
  "characteristicUuid": "0F9F8002-2AB2-45FB-82DB-BA8EFCEAE4B6",
  "serviceUuid": "C574EDB3-6551-473B-BAD8-65035F07E4A8",
  "characteristicValue": {},
  "properties": {
    "write": false,
    "writeNoResponse": false,
    "read": false,
    "notify": true,
    "indicate": true
  },
  "descriptors": [
    {
      "descriptorUuid": "00002902-0000-1000-8000-00805F9B34FB",
      "characteristicUuid": "0F9F8002-2AB2-45FB-82DB-BA8EFCEAE4B6",
      "serviceUuid": "C574EDB3-6551-473B-BAD8-65035F07E4A8",
      "descriptorValue": {}
    }
  ]
}

楼主对蓝牙知之甚少，只查到服务1中的0000FD21开头的serviceUuid是华为公司自己服务的代码，对服务2则完全没有头绪。请教各位大神，为何这两个服务订阅通知后会与耳机断连，如能解惑不甚感谢！另外附上订阅特征值变化通知的代码段。

this.gattClient!.setCharacteristicChangeNotification(characteristic, true, err => {
  if (err) {
    console.info(TAG,'notifyCharacteristicChanged callback failed');
  } else {
    console.info(TAG,'notifyCharacteristicChanged callback successful');
    this.gattClient!.on('BLECharacteristicChange', (characteristicChangeReq: ble.BLECharacteristic)=>{
      let serviceUuid: string = characteristicChangeReq.serviceUuid;
      let characteristicUuid: string = characteristicChangeReq.characteristicUuid;
      let value: Uint8Array = new Uint8Array(characteristicChangeReq.characteristicValue);
      console.info(TAG,'BLECharacteristicChange serviceUuid ',serviceUuid);
      console.info(TAG,'BLECharacteristicChange characteristicUuid',characteristicUuid);
      console.info(TAG,'BLECharacteristicChange value',value);
    });
  }
});