HarmonyOS 鸿蒙Next 蓝牙设置特性通知的 API 参数不理解

HarmonyOS 鸿蒙Next 蓝牙设置特性通知的 API 参数不理解

setCharacteristicChangeNotification 方法

import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
// 创建descriptors
let descriptors: Array<BLEDescriptor> = [];
let arrayBuffer = new ArrayBuffer(8);
let descV = new Uint8Array(arrayBuffer);
descV[0] = 11;
let descriptor: BLEDescriptor = {
  serviceUuid: 'xxxx',
  characteristicUuid: 'xxxx',
  descriptorUuid: 'xxxx', 
  descriptorValue: arrayBuffer
};
descriptors[0] = descriptor;
let arrayBufferC = new ArrayBuffer(8);
let characteristic: BLECharacteristic = {
  serviceUuid: 'xxxx',
  characteristicUuid: 'xxxx', 
  characteristicValue: arrayBufferC, 
  descriptors:descriptors
};
try {
  let device: GattClientDevice = ble.createGattClientDevice('XX:XX:XX:XX:XX:XX');
  device.setCharacteristicChangeNotification(characteristic, false);
} catch (err) {
  console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

客户端要设置，某个服务的特性通知，为什么还需要传递 characteristicValue ？ characteristicValue 这个参数的作用是什么，本身就是要接受通知的，为什么接受之前会有一个 value ？ 这个 value 从哪里来，参考安卓ios，以为微信小程序 Api 都不存在这个参数