HarmonyOS NEXT 5.0 的星闪（NearLink）开发应用案例

// CarEquipment.ets
import { nearLink } from '@kit.ConnectivityKit';

export class CarAdvertiser {
  private advParam: nearLink.AdvertisingParams = {
    advData: { serviceUuids: ['0000180D-0000-1000-8000-00805F9B34FB'] } // 自定义服务UUID
  };

  async startBroadcast() {
    try {
      await nearLink.startAdvertising(this.advParam);
      console.info('车辆广播已启动');
    } catch (err) {
      console.error(`广播失败: ${err.code}`);
    }
  }
}

// PhoneController.ets
import { nearLink, BusinessError } from '@kit.ConnectivityKit';

export class PhoneKey {
  private deviceManager: nearLink.DeviceManager | null = null;
  private connectedDevice: nearLink.Device | null = null;

  // 初始化设备管理
  async init() {
    this.deviceManager = await nearLink.createDeviceManager();
    this.deviceManager.on('deviceFound', (device: nearLink.Device) => {
      if (device.name === 'MyCar_NearLink') {
        this.connectToCar(device);
      }
    });
  }

  // 连接车辆
  async connectToCar(device: nearLink.Device) {
    try {
      this.connectedDevice = await this.deviceManager?.connect(device);
      console.info('车辆连接成功');
      this.monitorDistance(); // 启动距离监控
    } catch (err) {
      console.error(`连接失败: ${(err as BusinessError).message}`);
    }
  }

  // 基于距离控制门锁
  private monitorDistance() {
    this.connectedDevice?.on('rssiChanged', (rssi: number) => {
      if (rssi > -50) { // 信号强度阈值（约3米内）
        this.sendCommand("UNLOCK");
      } else {
        this.sendCommand("LOCK");
      }
    });
  }

  private sendCommand(cmd: string) {
    const data: Uint8Array = new TextEncoder().encode(cmd);
    this.connectedDevice?.sendData(data);
  }
}