Question

我正在做一个基于物联网的项目。所以我需要连接cloudmqtt和nodejs服务器。

app.js

// Create a MQTT Client
var mqtt = require('mqtt');

// Create a client connection to CloudMQTT for live data
var client = mqtt.connect('xxxxxxxxxxx', {
  username: 'xxxxx',
  password: 'xxxxxxx' 
});

client.on('connect', function() { // When connected
    console.log("Connected to CloudMQTT");
  // Subscribe to the temperature
  client.subscribe('Motion', function() {
    // When a message arrives, do something with it
    client.on('message', function(topic, message, packet) {
      // ** Need to pass message out **
    });
  });

});

然后启动了我的服务器。但没有任何事情发生（没有错误信息，没有警告）。请帮我这个吗？

Answer 1

现在cloudmqtt和nodejs服务器通过提供额外的参数来连接，例如clientId，keepalive，protocolVersion等。

<强> app.js

var mqtt = require('mqtt');
var options = {
    port: 15255,
    host: 'mqtt://m11.cloudmqtt.com',
    clientId: 'mqttjs_' + Math.random().toString(16).substr(2, 8),
    username: 'xxxxxxxxxxxxxxxxxx',
    password: 'xxxxxxxxxxxxxxxxxx',
    keepalive: 60,
    reconnectPeriod: 1000,
    protocolId: 'MQIsdp',
    protocolVersion: 3,
    clean: true,
    encoding: 'utf8'
};
var client = mqtt.connect('mqtt://m11.cloudmqtt.com', options);
client.on('connect', function() { // When connected
    console.log('connected');
    // subscribe to a topic
    client.subscribe('topic1/#', function() {
        // when a message arrives, do something with it
        client.on('message', function(topic, message, packet) {
            console.log("Received '" + message + "' on '" + topic + "'");
        });
    });

    // publish a message to a topic
    client.publish('topic1/#', 'my message', function() {
        console.log("Message is published");
        client.end(); // Close the connection when published
    });
});

Answer 2

连接可能出错了，尝试添加它，我想你会看到一些东西：

client.on('error', function(err) {
    console.log(err);
});

Answer 3

我已经实现了CLOUD MQTT和NodeJs接口。


    
    var mqtt = require('mqtt'),url = require('url')
    var client = mqtt.createClient(PORTNO,"m10.cloudmqtt.com",
    {
        username: "xxxxxxxxx",
        password: "xxxxxxxxx"
    });

    client.on('connect',function()
    {
        client.publish("Hello",function()
        {
            client.end();
        })
    })

Answer 4

请检查IP和端口是否在您启动/配置MQTT服务器的位置打开。可能这两个阻止防病毒防火墙或服务器防火墙我没有得到你的访问端口。请在连接云mqtt之前检查这些服务器设置。

activemq.xml and jetty.xml

    name="openwire" uri="tcp://0.0.0.0:61616 (default)
    name="amqp" uri="amqp://0.0.0.0:5672 (default)
    name="stomp" uri="stomp://0.0.0.0:61613 (default)
    name="mqtt" uri="mqtt://0.0.0.0:1883 (default) (Android and Ios team)
    name="ws" uri="ws://0.0.0.0:61614 (default) (Php team)

访问网址mqtt：http://127.0.0.1:8172/admin/

    Un:admin (default)
    Ps:admin (default)

请看看物联网核心如果你使用Node.js构建一个应用程序那里有Mosca（http://www.mosca.io）

如果您使用Python构建应用程序，可以查看hbmqtt（https://github.com/beerfactory/hbmqtt）

开发人员结束代码共享，也许会有所帮助：

if (!window.WebSocket) {
    $("#connect").html("\

            <p>\
            Your browser does not support WebSockets. This example will not work properly.<br>\
            Please use a Web Browser with WebSockets support (WebKit or Google Chrome).\
            </p>\
        ");
} else {
    function subscribeClient() {
        var currentDate = new Date();
        var mqtt_clientId = CURRENT_USER_ID + "-" + currentDate.getTime();     
        var mqtt_host = '00.000.00.000';
        var mqtt_port = '00000';
        var mqtt_user = 'xxxxx';
        var mqtt_password = 'xxxxx';
        $("#connect_clientId").val("example-" + (Math.floor(Math.random() * 100000)));
        var timeout = 3000 / 2;
        var keepAliveInterval = 3000;
        var maxMqqtConnectCount = 80;
        client = new Messaging.Client(mqtt_host, Number(mqtt_port), mqtt_clientId);
        client.onConnect = onConnect;
        client.onMessageArrived = onMessageArrived;
        client.onConnectionLost = onConnectionLost;
        // the client is notified when it is connected to the server.
        var onConnect = function (frame) {
            console.log('mqqt connected.');
            $("#chat_conn").val(1);
            $(".offline-alert").css("display", "none");
            // connecting client
            client.subscribe(topicId);
            //subscribing to multiple groups
            var groups = JSON.parse($("#current_user_groups").val());
            $(groups).each(function (index, element) {
                var group_id = element["GroupID"];
                var group_topic_id = getGroupTopicId(group_id);
                client.subscribe(group_topic_id);
            });

        };

        function disconnectClient() {
            client.disconnect();
            $(".offline-alert").css("display", "block");
            $("#chat_conn").val(0);
        }

        function onFailure(failure) {
            console.log('mqqt connectinn failed');
            $("#chat_conn").val(0);
            $(".offline-alert").css("display", "block");
            connectMqtt();
        }

        function onConnectionLost(responseObject) {
            console.log('mqqt connectinn lost');
            $("#chat_conn").val(0);
            $(".offline-alert").css("display", "block");
            connectMqtt();
        }

        function onMessageArrived(message) {
            if (!message) {
                return false;
            }
            console.log(message.payloadString);

            }


        function connectMqtt()
        {
            var currentConnectionCount = getMqqtConnectionLostCount();
            if (currentConnectionCount <= maxMqqtConnectCount)
            {
                setMqqtConnectionLostCount();
                console.log('connecting mqqt ' + getMqqtConnectionLostCount() + ' times.');
                client.connect({
                    timeout: timeout, //seconds
                    keepAliveInterval: keepAliveInterval,
                    userName: mqtt_user,
                    useSSL: false, // for secure connection on https #added by Virendra Yadav ver1.1 on 2015-02-03 to set MQTT SSL use setting
                    password: mqtt_password,
                    onSuccess: onConnect,
                    onFailure: onFailure,
                });
            } else
            {

                console.log('mqqt unable to connect more than ' + maxMqqtConnectCount + ' times.');
                window.location.reload();
            }
        }
        connectMqtt();

        function setMqqtConnectionLostCount()
        {
            var currentConnectionLostCount = getMqqtConnectionLostCount();
            currentConnectionLostCount = parseInt(currentConnectionLostCount);
            currentConnectionLostCount = currentConnectionLostCount + 1;
            $('#mqqtReconnectConnectionCount').val(currentConnectionLostCount);
        }
        function getMqqtConnectionLostCount()
        {
            var countVal = $('#mqqtReconnectConnectionCount').val();
            return countVal;
        }
    }

Answer 5

请注意，密码是一个缓冲区，您可以在选项上传递任何属性：

var options = { username: 'strUserName',
                password: new Buffer('strPassword')};

var client = mqtt.connect('mqtt://m11.cloudmqtt.com', options);

连接nodejs和云mqtt

5 个答案: