mqtt node.js basic example

var mqtt    = require('mqtt');
var client  = mqtt.connect('ws://iot.eclipse.org:80/ws');

client.on('connect', function () {
    client.subscribe('presense');
    client.publish('presence', 'Hello mqtt');
});

client.on('message', function (topic, message) {
  // message is Buffer
    console.log(message.toString());
    client.end();
});


for testing create a client using iot.eclipse.org(node-red)

server :iot.eclipse.org

port:1880

topic: pick

edited example:

var mqtt    = require('mqtt');
var client  = mqtt.connect('ws://iot.eclipse.org:80/ws');

client.on('connect', function () {
    client.subscribe('pick');               //topic subscribed
    client.publish('presence', 'Hello mqtt');
});

client.on('message', function (topic, message) {
  // message is Buffer
    console.log(message.toString());
    //client.end();
});