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mqtt------ mosca服务器端参数简介

时间:2018-11-14 14:21:13      阅读:1791      评论:0      收藏:0      [点我收藏+]

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一:服务器端

为什么使用mosca:mosca是基于node.js开发,上手难度相对较小,其次协议支持完整,除了不支持Qos 2,其它的基本都支持。持久化支持redis以及mongo。二次开发接口简单。部署非常简单,并且支持docker镜像。

mosca参数简介:

var mosca = require(‘mosca‘)

ascoltatore :  是Mosca作者开发的一个订阅与发布类库,Mosca核心的订阅与发布模型

var ascoltatore = {
        type: redis, //指定类型,mongo的写法请参考官方wiki
        redis: require(redis),
        db: 1,
        port: 6379,
        return_buffers: true, // to handle binary payloads
        //指定数据保留多长时间,单位毫秒
      ttl: {  
            // TTL for subscriptions is 23 hour 
            subscriptions: 23 * 60 * 60 * 1000,
       // TTL for packets is 23 hour 
            packets: 23 * 60 * 60 * 1000, 
          },
          host: "localhost"
    };                                       

//基本参数设置

var moscaSettings = {
        port: 1883, //设置监听端口
        backend: ascoltatore,
        maxInflightMessages: 10240, //设置单条消息的最大长度,超出后服务端会返回
      //设置WebSocket参数
      http: {
      port: 1884,
      bundle: true,
       static: ./ },
      //数据持久化参数设置
      persistence: {
            factory: mosca.persistence.Redis,
            db: 1,
            port: 6379,
            return_buffers: true, // to handle binary payloads
            ttl: { 
                         // TTL for subscriptions is 23 hour 
                         subscriptions: 23 * 60 * 60 * 1000, 
                         // TTL for packets is 23 hour 
                         packets: 23 * 60 * 60 * 1000, },
                host: "localhost" 
                      }
        }                       

//如果需要用户登录验证权限,需要改写此方法

//这里以简单判断了用户名和密码为例,真实环境可以连接实际业务系统的鉴权服务 

var authenticate = function(client, username, password, callback) {
    var authorized = (username === test &;&; password.toString() === passwd);
    if (authorized) client.user = username;
    callback(null, authorized);
 }

function authPub(client, topic, payload, callback) {
   callback(null, payload);
} function authSub(client, topic, callback) {    callback(
null, topic);
}
var server = new mosca.Server(moscaSettings); server.on(ready, setup); server.on(clientConnected, function(client) {     console.log(client connected, client.id);
}); server.on(
published, function(packet, client) {     console.log(Published, packet.topic + packet.payload);
});
// fired when the mqtt server is ready function setup() {    server.authenticate = authenticate;    server.authorizePublish = authPub;    server.authorizeSubscribe = authSub;    console.log(Mosca server is up and running) }

二次开发可以监听的事件列表

clientConnected: when a client is connected; the client is passed as a parameter.

clientDisconnecting: when a client is being disconnected; the client is passed as a parameter.

clientDisconnected: when a client is disconnected; the client is passed as a parameter.

published: when a new message is published; the packet and the client are passed as parameters.

delivered: when a client has sent back a puback for a published message; the packet and the client are passed as parameters.

subscribed: when a client is subscribed to a topic; the topic and the client are passed as parameters.

unsubscribed: when a client is unsubscribed to a topic; the topic and the client are passed as parameters.

有了上面可以监听到事件你就可以根据自己的业务进行相应的开发,拦截特定的事件并添加业务代码

ascoltatore托管地址 https://github.com/mcollina/ascoltatori

高级参数设置可以参考 https://github.com/mcollina/mosca/wiki/Mosca-advanced-usage

权限验证可以参考 https://github.com/mcollina/mosca/wiki/Authentication-&;-Authorization

配置ssl可以参考 https://github.com/mcollina/mosca/wiki/TLS-SSL-Configuration

配置WebSocket可以参考 https://github.com/mcollina/mosca/wiki/MQTT-over-Websockets

mqtt------ mosca服务器端参数简介

标签:user   advance   The   serve   subscript   它的   inf   wiki   难度   

原文地址:https://www.cnblogs.com/Joans/p/9957128.html

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