mqtt------ mosca伺服器端引數簡介
一:伺服器端
為什麼使用mosca:mosca是基於node.js開發,上手難度相對較小,其次協議支援完整,除了不支援Qos 2,其它的基本都支援。持久化支援redis以及mongo。二次開發介面簡單。部署非常簡單,並且支援docker映象。
mosca引數簡介:
var mosca = require('mosca')
ascoltatore : 是Mosca作者開發的一個訂閱與釋出類庫,Mosca核心的訂閱與釋出模型
var ascoltatore = { type: 'redis', //指定型別,mongo的寫法請參考官方wiki redis: require('redis'), db: 1, port: 6379, return_buffers: true, // to handle binary payloads //指定資料保留多長時間,單位毫秒 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" };
//基本引數設定
var moscaSettings = { port: 1883, //設定監聽埠 backend: ascoltatore, maxInflightMessages: 10240, //設定單條訊息的最大長度,超出後服務端會返回 //設定WebSocket引數 http: { port:1884, bundle: true, static: './' }, //資料持久化引數設定 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" } }
//如果需要使用者登入驗證許可權,需要改寫此方法
//這裡以簡單判斷了使用者名稱和密碼為例,真實環境可以連線實際業務系統的鑑權服務
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') }
二次開發可以監聽的事件列表
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.
有了上面可以監聽到事件你就可以根據自己的業務進行相應的開發,攔截特定的事件並新增業務程式碼
ascoltatore託管地址 https://github.com/mcollina/ascoltatori
高階引數設定可以參考 https://github.com/mcollina/mosca/wiki/Mosca-advanced-usage
許可權驗證可以參考 https://github.com/mcollina/mosca/wiki/Authentication-&;-Authorization
配置ssl可以參考 https://github.com/mcollina/mosca/wiki/TLS-SSL-Configuration
配置WebSocket可以參考 https://github.com/mcollina/mosca/wiki/MQTT-over-Websockets