const mqtt = require('mqtt');
const client = mqtt.connect('mqtt://broker.emqx.io'); // 使用公共MQTT broker作为示例

const DEVICE_TOPIC = 'device/info';
const PERSON_TOPIC = 'person/info';

client.on('connect', () => {
  console.log('Connected to MQTT broker');
  client.subscribe(DEVICE_TOPIC, (err) => {
    if (!err) {
      console.log(`Subscribed to ${DEVICE_TOPIC}`);
    }
  });
});

client.on('message', (topic, message) => {
  if (topic === DEVICE_TOPIC) {
    console.log('Received device info:', message.toString());
    // 这里处理接收到的设备信息
    // 例如: 保存到数据库或触发其他操作
  }
});

function publishPersonInfo(personInfo) {
  const message = JSON.stringify(personInfo);
  client.publish(PERSON_TOPIC, message, { qos: 1 }, (err) => {
    if (!err) {
      console.log('Person info published successfully');
    } else {
      console.error('Failed to publish person info:', err);
    }
  });
}

module.exports = {
  publishPersonInfo
};