​如何通过Network Kit实现智能家居设备的局域网发现与通信？

import socket from '@ohos.net.socket';

// 设备端广播自身信息
const udpServer = socket.constructUDPSocketInstance();
udpServer.bind({ address: '0.0.0.0', port: 5683 }, (err) => {
  const deviceInfo = JSON.stringify({ id: 'device_123', type: 'light' });
  udpServer.send({ data: deviceInfo, address: '224.0.0.251', port: 5683 });
});

// 手机端监听组播消息
const udpClient = socket.constructUDPSocketInstance();
udpClient.on('message', (data) => {
  const device = JSON.parse(data.message); // 解析设备信息
  console.log('发现设备:', device.id);
});
udpClient.bind({ address: '224.0.0.251', port: 5683 });
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import mdns from '@ohos.net.mdns';

// 设备端注册服务
const serviceInfo = {
  serviceName: '_smartlight._tcp',
  serviceType: mdns.ServiceType.TCP,
  port: 8080,
  attributes: { id: 'light_001' }
};
mdns.addService(serviceInfo);

// 手机端发现服务
mdns.createDiscovery('_smartlight._tcp', (service) => {
  console.log('发现设备:', service.attributes.id);
});
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import http from '@ohos.net.http';

// 控制智能灯具
const request = http.createHttp();
await request.request('http://192.168.1.100:8080/light', {
  method: http.RequestMethod.PUT,
  header: { 'Content-Type': 'application/json' },
  extraData: JSON.stringify({ brightness: 50 })
});
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import socket from '@ohos.net.socket';

// 手机端发送指令
const tcpClient = socket.constructTCPSocketInstance();
await tcpClient.connect({ address: '192.168.1.100', port: 8080 });
tcpClient.send({ data: 'ON' }); // 发送开灯指令
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// 初始化客户端
const client = new Paho.MQTT.Client('mqtt://broker.example.com', 'clientId');
client.connect({
  onSuccess: () => {
    client.subscribe('home/light/control');
  }
});

// 发布控制指令
client.publish('home/light/control', JSON.stringify({ cmd: 'toggle' }));
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import webSocket from '@ohos.net.webSocket';

const ws = webSocket.createWebSocket();
ws.connect('ws://mqtt-broker:1883/mqtt');
ws.send('CONNECT client_id'); // MQTT协议握手
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import coap from 'coap';

// 手机端发送CoAP请求
const req = coap.request('coap://192.168.1.100:5683/light');
req.on('response', (res) => {
  console.log('状态码:', res.code);
});
req.end();
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// 发送CoAP报文（需手动封装协议头）
const coapPacket = buildCoapPacket({ code: 'PUT', payload: 'brightness=50' });
udpClient.send({ address: '192.168.1.100', port: 5683, data: coapPacket });
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// MQTT心跳设置
client.connect({ keepAliveInterval: 600 }); // 10分钟一次心跳
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import power from '@ohos.powermgr';
// 设备进入深度睡眠
power.deepsleep(30000); // 休眠30秒
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// MQTT over TLS
const client = new Paho.MQTT.Client('ssl://broker.example.com:8883', 'clientId');

// CoAP over DTLS（需硬件支持）
const dtlsSocket = socket.constructUDPSocketInstance();
dtlsSocket.enableDTLS({ psk: '预共享密钥' });
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// MQTT连接时携带Token
client.connect({
  userName: 'device_123',
  password: 'secure_token'
});
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