Centos mosquitto mqtt支持 websocket javaclient jsclient

一、mosquitto broker篇

1.依赖环境安装：

yum install gcc-c++

yum install openssl-develyum install c-ares-develyum install libuuid-devle

注：某些系统可能自带这些依赖环境，直接过滤

2.websocket支持

git clone https://git.oschina.net/woniu201/libwebsockets.git

安装libwebsockets需要cmake命令，需要2.8以上版本，yum安装的可能是2.6的版本，需要手动下载2.8以上的版本进行安装，请自行百度或谷歌下载，本文档使用cmake-3.2.3-Linux-x86_64 ，安装后直接设置环境变量即可。

1）tar -zxvf cmake-3.2.3-Linux-x86_64.tar.gz

2）解压后添加环境变量，刷新环境变量

vi /etc/profile

注：需要卸载老版本的cmake ，yum remove cmake

3）查看版本

cmake --version

4）安装websocket

tar -zxvf libwebsockets-v1.5-stable.tar.gz

cd libwebsockets/

mkdir build

cd build/

cmake ..

make install

3.mosquitto安装

wget wget http://mosquitto.org/files/source/mosquitto-1.4.11.tar.gz

tar zxvf mosquitto-1.4.11.tar.gz

cd mosquitto-1.4.11

vi config.mk 修改如下三项值

#关闭tls验证

WITH_TLS:=no

WITH_TLS_PSK:=no

##开启websocket支持

WITH_WEBSOCKETS:=yes

make

make install

修改mosquitto.conf配置文件，添加websocket支持

cd /etc/mosquitto/

cp mosquitto.conf.example mosquitto.conf

vi mosquitto.conf

修改如下参数：

listener 81

protocol websockets

5.启动mosquitto

mosquitto -c /etc/mosquitto/mosquitto.conf

如出现如上错误

ln -s /usr/local/lib/libwebsockets.so.5 /usr/lib64/libwebsockets.so.5

二、java篇

javaclient端使用的 eclipse.paho 包，Pom配置如下：

<groupId>org.eclipse.paho</groupId>

<artifactId>org.eclipse.paho.client.mqttv3</artifactId>

</dependency>

<groupId>org.fusesource.mqtt-client</groupId>

<artifactId>mqtt-client</artifactId>

</dependency>

1.client 代码：

import java.util.Scanner;

import org.eclipse.paho.client.mqttv3.MqttClient;

import org.eclipse.paho.client.mqttv3.MqttConnectOptions;

import org.eclipse.paho.client.mqttv3.MqttException;

import org.eclipse.paho.client.mqttv3.MqttMessage;

import org.eclipse.paho.client.mqttv3.MqttTopic;

import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

/**

* [简要描述]:<br/>

* [详细描述]:<br/>

* @author xiaolinlin

* @version 1.0, 2017年6月8日

* @since smile V100R001C00

public class MqttTestClient

{

public static final String HOST = "tcp://ip:1881";

public static final String TOPIC = "mqtt/topic";

private static final String clientid = "client124";

private MqttClient client;

private MqttConnectOptions options;

private String userName = "admin";

private String passWord = "admin123";

private void start() throws MqttException

{

try

{

// host为主机名，clientid即连接MQTT的客户端ID，一般以唯一标识符表示，MemoryPersistence设置clientid的保存形式，默认为以内存保存

client = new MqttClient(HOST, clientid, new MemoryPersistence());

// MQTT的连接设置

options = new MqttConnectOptions();

// 设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录，这里设置为true表示每次连接到服务器都以新的身份连接

options.setCleanSession(true);

// 设置连接的用户名

// options.setUserName(userName);

// 设置连接的密码

// options.setPassword(passWord.toCharArray());

// 设置超时时间单位为秒

options.setConnectionTimeout(10);

// 设置会话心跳时间单位为秒服务器会每隔1.5*20秒的时间向客户端发送个消息判断客户端是否在线，但这个方法并没有重连的机制

options.setKeepAliveInterval(20);

// 设置回调

MqttTopic topic = client.getTopic(TOPIC);

// setWill方法，如果项目中需要知道客户端是否掉线可以调用该方法。设置最终端口的通知消息

options.setWill(topic, "close".getBytes(), 2, true);

client.connect(options);

client.setCallback(new ClientCallback(client,options));

// 订阅消息

int[] Qos = {1};

String[] topic1 = {TOPIC};

client.subscribe(topic1, Qos);

Scanner in = new Scanner(System.in);

String msg = "";

MqttMessage message = null;

while (true)

{

msg = in.nextLine();

if (msg.contains("colse"))

{

message = new MqttMessage(msg.getBytes());

break;

}

message = new MqttMessage(msg.getBytes());

topic.publish(message);

}

in.close();

}

catch (Exception e)

{

e.printStackTrace();

}

finally {

client.disconnect();

}

public static void main(String[] args) throws MqttException

{

MqttTestClient client = new MqttTestClient();

client.start();

}

// callback 类

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;

import org.eclipse.paho.client.mqttv3.MqttCallback;

import org.eclipse.paho.client.mqttv3.MqttClient;

import org.eclipse.paho.client.mqttv3.MqttConnectOptions;

import org.eclipse.paho.client.mqttv3.MqttException;

import org.eclipse.paho.client.mqttv3.MqttMessage;

import org.eclipse.paho.client.mqttv3.MqttSecurityException;

/**

* [简要描述]:<br/>

* [详细描述]:<br/>

* @author xiaolinlin

* @version 1.0, 2017年6月8日

* @since smile V100R001C00

public class ClientCallback implements MqttCallback

{

private MqttClient client;

private MqttConnectOptions options;

public ClientCallback(MqttClient client,MqttConnectOptions options) {

this.client = client;

this.options = options;

}

@Override

public void connectionLost(Throwable cause)

{

// 连接丢失后，一般在这里面进行重连

System.out.println("连接断开，可以做重连");

try

{

client.connect(options);

}

catch (MqttSecurityException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (MqttException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

// while(!sampleClient.isConnected()){

// try {

// Thread.sleep(1000);

// sampleClient.connect(connOpts);

// //客户端每次上线都必须上传自己所有涉及的订阅关系，否则可能会导致消息接收延迟

// sampleClient.subscribe(topicFilters,qos);

// } catch (Exception e) {

// e.printStackTrace();

// }

}

@Override

public void messageArrived(String topic, MqttMessage message) throws Exception

{

// subscribe后得到的消息会执行到这里面

System.out.println("接收消息主题 : " + topic);

System.out.println("接收消息Qos : " + message.getQos());

String msg = new String(message.getPayload());

System.out.println("接收消息到服务端内容 : " + msg);

if(msg.contains("close")) {

client.close();

}

@Override

public void deliveryComplete(IMqttDeliveryToken token)

{

System.out.println("deliveryComplete---------" + token.isComplete());

}

2：server端

import java.io.UnsupportedEncodingException;

import java.util.Scanner;

import org.eclipse.paho.client.mqttv3.MqttCallback;

import org.eclipse.paho.client.mqttv3.MqttClient;

import org.eclipse.paho.client.mqttv3.MqttClientPersistence;

import org.eclipse.paho.client.mqttv3.MqttConnectOptions;

import org.eclipse.paho.client.mqttv3.MqttDeliveryToken;

import org.eclipse.paho.client.mqttv3.MqttException;

import org.eclipse.paho.client.mqttv3.MqttMessage;

import org.eclipse.paho.client.mqttv3.MqttPersistenceException;

import org.eclipse.paho.client.mqttv3.MqttTopic;

import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

/**

* [简要描述]:<br/>

* [详细描述]:<br/>

* @author xiaolinlin

* @version 1.0, 2017年6月8日

* @since smile V100R001C00

public class MqttServer

{

public static void main(String[] args) throws InterruptedException, MqttException

{

String serverURI = "tcp://ip:1881";

String clientId = "server001";

MqttClient client = null;

try

{

// MemoryPersistence设置clientid的保存形式，默认为以内存保存

MqttClientPersistence persistence = new MemoryPersistence();

// 异步待研究

// MqttAsyncClient client = new MqttAsyncClient(serverURI,

// clientId, persistence );

client = new MqttClient(serverURI, clientId, persistence);

MqttConnectOptions options = new MqttConnectOptions();

// 设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录，设置为true表示每次连接到服务器都以新的身份连接

options.setCleanSession(false);

// options.setUserName("admin");

// options.setPassword("admin123".toCharArray());

// 超时时间单位S

options.setConnectionTimeout(5);

// 设置会话心跳时间单位S 服务器会每隔1.5*20秒的时间向客户端发送个消息判断客户端是否在线，但这个方法并没有重连的机制

options.setKeepAliveInterval(10);

// 自动重连

options.setAutomaticReconnect(true);

MqttCallback callback = new ReciveCallback(client,options);

// 建立链接

client.connect(options);

client.setCallback(callback);

String topicStr = "mqtt/topic";

MqttTopic topic = client.getTopic(topicStr);

String msg = "";

Scanner in = new Scanner(System.in);

while(true) {

msg = in.nextLine();

if(msg.contains("close")) {

pushMsg(topic, msg);

break;

}

pushMsg(topic, msg);

}

in.close();

}

catch (MqttException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

finally {

client.close();

}

public static void pushMsg(MqttTopic topic, String msg)

{

MqttDeliveryToken token;

try

{

MqttMessage message = new MqttMessage();

message.setQos(1);

// 是否保留

message.setRetained(true);

byte[] payload = msg.getBytes("utf-8");

// 实际消息内容

message.setPayload(payload);

token = topic.publish(message);

// 等待完成

token.waitForCompletion();

// 打印完成状态

System.out.println(token.isComplete() + "========");

}

catch (MqttPersistenceException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (MqttException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (UnsupportedEncodingException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

call back类

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;

import org.eclipse.paho.client.mqttv3.MqttCallback;

import org.eclipse.paho.client.mqttv3.MqttClient;

import org.eclipse.paho.client.mqttv3.MqttConnectOptions;

import org.eclipse.paho.client.mqttv3.MqttException;

import org.eclipse.paho.client.mqttv3.MqttMessage;

import org.eclipse.paho.client.mqttv3.MqttSecurityException;

/**

* [简要描述]:<br/>

* [详细描述]:<br/>

* @author xiaolinlin

* @version 1.0, 2017年6月8日

* @since smile V100R001C00

public class ReciveCallback implements MqttCallback

{

public ReciveCallback(MqttClient client,MqttConnectOptions options) {

this.client = client;

this.options = options;

}

private MqttClient client;

private MqttConnectOptions options;

@Override

public void connectionLost(Throwable cause)

{

// 连接丢失后，一般在这里面进行重连

System.out.println("连接断开，可以做重连");

try

{

client.connect(options);

}

catch (MqttSecurityException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

catch (MqttException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

@Override

public void messageArrived(String topic, MqttMessage message) throws Exception

{

// subscribe后得到的消息会执行到这里面

System.out.println("接收消息主题 : " + topic);

System.out.println("接收消息Qos : " + message.getQos());

String msg = new String(message.getPayload());

System.out.println("接收消息客户端内容 : " + new String(message.getPayload()));

if(msg.contains("close")) {

client.close();

}

@Override

public void deliveryComplete(IMqttDeliveryToken token)

{

System.out.println("deliveryComplete---------" + token.isComplete());

}

三、js篇

html代码：

<!DOCTYPE html>

<html>

<head>

var topic = "mqtt/topic";

var hostname = "120.76.216.235";

var port = 81;

var reconnectTimeout = 2000;

var mqtt;

var options;

var username,password;

function MQTTconnect() {

var clientId = "ClientID_0022";

//var username = 'LTAItKYvBCx06Dbz';

mqtt = new Paho.MQTT.Client(hostname, port, clientId);

options = {

timeout: 3,

// useSSL: useTLS,

cleanSession: true,

onSuccess: onConnect, //if true(default) the client and server persistent state is deleted on successful connect.

onFailure: function (message) {

$('#status').val("Connection failed: " + message.errorMessage + "Retrying");

setTimeout(MQTTconnect, reconnectTimeout);

}

};

mqtt.onConnectionLost = onConnectionLost;

mqtt.onMessageArrived = onMessageArrived;

if (username) {

options.userName = username;

options.password = password;

}

console.log("username=" + username + " password=" + password);

mqtt.connect(options);

}

function onConnect() {

$('#status').val('Connected to ' + hostname + ':' + port);

// Connection succeeded; subscribe to our topic

mqtt.subscribe(topic, {qos: 0});

$('#topic').val(topic);

}

function onConnectionLost(response) {

setTimeout(MQTTconnect, reconnectTimeout);

$('#status').val("connection lost: " + response.errorMessage + ". Reconnecting");

};

function onMessageArrived(message) {

var topic = message.destinationName;

var payload = message.payloadString;

$('#ws').prepend('<li>' + topic + ' = ' + payload + '</li>');

};

function button_onclick(){

//这里写你要执行的语句

var tp = $('#sendtopic').val();

var val = $('#textsend').val();

if(tp==''||val=='')

{

alert("no aaa");

return;

}

var message = new Paho.MQTT.Message(val);

message.destinationName = tp;

message.qos=0;

mqtt.send(message);

// mqtt.publish(tp, 0, val);

$('#ws').prepend('<li>' + tp + ' = ' + val+ '</li>');

};

$(document).ready(function() {

MQTTconnect();

});

</script>

</head>

<body>

<h1>Mosquitto Websockets</h1>

<div>

<div>Subscribed to <input type='text' id='topic' disabled />

Status: <input type='text' id='status' size="80" disabled />

</br>

publish to <input type='text' id='sendtopic' /> text <input type='text' id='textsend' size="80"/>

Status: <input type='button' value="send" id='btn' onclick="javascript:button_onclick()"/></div>

</div>

</body>

</html>

引用的js自行下载，其中mqttws31-min.js 也是属于eclipse.paho 中的。

四、效果篇

附一些需要讨论的问题：

1.鉴权的考虑

2.点对点消息的考虑

3.性能考虑

Centos mosquitto mqtt支持 websocket javaclient jsclient

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