Connecting nodejs and cloud mqtt

Question

I am doing a project based on IOT. So I need to connect cloudmqtt and nodejs server.

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 **
    });
  });

});

Then started my server. But nothing is happening(No error message and no warning).Please help me on this?

Answer 1

Now the cloudmqtt and nodejs server is connected by giving extra parameters like clientId,keepalive,protocolVersion etc.

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

It's possible the connect goes wrong, try to add this and I think you will see something:

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

Answer 3

I have implemented CLOUD MQTT and NodeJs interfacing.

    
    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

Please check IP and port open on where you start/config your MQTT server. May these two block by antivirus firewall or server firewall And i didn't get your access port. Please check these server setting before you connect cloud mqtt.

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)

Access url mqtt :http://127.0.0.1:8172/admin/

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

And please take look on IoT Core If you're building an application using Node.js there's Mosca (http://www.mosca.io)

If you're building an application using Python, you can check out hbmqtt (https://github.com/beerfactory/hbmqtt)

Developer end code share, maybe it will help:

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

Note that password is a buffer and you can pass any attribute on the option:

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

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