nodejs中搭建mqtt

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使用nodejs编写一个简单的服务器，然后在编写两个客户端，一个客户端用来接收消息，另一个客户端用来发送消息：

服务器代码为：不过，你第一次运行的时候，会缺少mosca模块，自己npm install mosca即可。具体功能，学过编程的大致都能看懂，然后里面都有注释。

var mosca = require('mosca');//构建服务器/*var settings = {port:8989,backend:{type:'zmq',json:false,zmq:require("zmq"),port:"tcp://127.0.0.1:33334",controlPort:"tcp://127.0.0.1:33334",delay:5},persistence: {factory:mosca.persistence.Mongo,url:"mongodb://localhost:270117/mosca"}};var MqttServer = new mosca.Server(settings);*/var MqttServer = new mosca.Server({port:8000});//监听链接MqttServer.on("clientConnected",function(client) {console.log("client connected",client.id);});//监听mqtt的主题消息MqttServer.on("published",function(packet,client) {//当客户端有连接的时候，发布主题消息var topic = packet.topic;console.log(packet);switch(topic) {case 'test':console.log("message-publish",packet.payload.toString());//mqtt转发主题消息MqttServer.publish({topic:'other',payload:'这是服务端！'});break;case 'test2':console.log("payload:",packet.payload.toString());var msg = {topic:'repeat',payload:packet.payload,qos:0,retain:false};MqttServer.publish(msg,function() {console.log('repeat!   ');});break;case 'other':console.log("case-other:",packet.payload.toString());break;}});MqttServer.on('ready',function() {console.log("mqtt is running....");});

发送消息客户端：

var mqtt = require('mqtt');var client = mqtt.connect('mqtt://192.168.1.136:8000');//连接到服务端var num = 0;var qtt = {};//定义消息（可以为字符串，对象等）qtt.aa = '发布';qtt.bb = '消息！';setInterval(function() {//发布主题为Test的消息client.publish('test',JSON.stringify(qtt),{qos:1,retain:true});//hello mqtt + num++},1000);

接收消息的客户端；

var mqtt = require('mqtt');var client2 = mqtt.connect("mqtt://192.168.1.136:8000");client2.subscribe('test',{qos:1});//订阅主题为test的消息client2.on('message',function(top,message) {console.log(message.toString());});

至此第一个简单的nodejs版的mqtt的demo已经搭建完毕，后期具体的开发，见后文的博客！

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