arkts中如何使用mqtt协议？

# 安装MQTT库
ohpm install @ohos/mqtt-paho

// 初始化
const client = new mqtt.Client({
  uri: 'ws://broker.hivemq.com:8000/mqtt',
  clientId: 'ohos_device_001'
});

// 连接与回调
client.connect({
  onSuccess: () => {
    client.subscribe('device/data', { qos: 1 });
  }
});

// 接收消息
client.on('messageArrived', (msg) => {
  console.log(`收到：${msg.payloadString}`);
});

// 发布消息
const message = new mqtt.Message('传感器数据');
message.destinationName = 'device/data';
client.send(message);