nodejs 实现MQTT协议的服务器端和客户端的双向交互的过程

const aedes = require('aedes')();
const aedesServer = require('net').createServer(aedes.handle);
const port = 1883;
aedesServer.listen(port, function () {
    console.log('服务启动并开始监听端口：', port)
})
//监听MQTT服务器端口，当有客户端连接上时，触发该回调
aedes.on("client", (client) => {
    console.log("客户端连接成功:", client.id);
})
//监听MQTT服务器端口，当有客户端主动断开连接或者服务器600s内没收到某个客户端的心跳包就会触发
aedes.on("clientDisconnect", (client) => {
    console.log("客户端断开连接:", client.id);
})
//监听客户端发布的主题
aedes.on("publish", function (packet, client) {
    //针对不同的客户端写不同的逻辑
    if (client) {
        //根据主题不同写不同的逻辑，建议采用JSON格式传输
        console.log("监听客户端发过来的消息",packet.topic, packet.payload.toString());
    }
})
//服务器发出的消息
setInterval(() => {
    aedes.publish({
        topic: "serverMsg",
        payload: "服务器发消息",
        qos: 1,
        retain: false,
        dup: false,
        cmd: "publish"
    }, (err) => {
        if (err) {
            console.log("发布失败");
        }
    });
}, 20000)

var mqtt = require('mqtt');
var client = mqtt.connect('mqtt://192.168.70.220:1883',{
    clientId:'nodejs-mqtt-client'
})
client.on('connect',function (){
    console.log('连接上MQTT服务器')
    //需要订阅服务器主题，不然无法接受消息
    client.subscribe('serverMsg',{
        qos:1
    })
})
//发布客户端消息
setInterval(()=>{
    client.publish('topic1','hello mqtt client',{
        qos:1
    })
},20000)
client.on('message',function (topic,message){
    console.log('接受服务器消息:','主题：',topic,'消息：',message.toString())
})