Achieving Reliable MQTT Connection

Is there anyone who can help me achieving reliable MQTT connection? I cannot reconnect to the MQTT server after it disconnects for some reason. I tried with two different MQTT server and results are same. Connecting back to the MQTT server on disconnected event does not work.

disconnected
disconnected
disconnected
disconnected
disconnected
disconnected
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket
ERROR: Unable to create socket

var wifi = require("Wifi");
var mqtt = require("tinyMQTT").create("XXXXX", {
    username: "XXXXX",
    password: "XXXXX",
    port: XXXX
});

mqtt.on("connected", function(){
    console.log("connected");
    mqtt.subscribe("espruino/test");
    isMQTTAlive = true;
});

mqtt.on("message", function(msg){
    console.log(msg.topic);
    console.log(msg.message);
});

mqtt.on("published", function(){
    console.log("message sent");
});

mqtt.on("disconnected", function(){
    console.log("disconnected");
    mqtt.connect();
});


function start() {
  wifi.setHostname("navas178");
  wifi.connect("XXXX", {password:"XXXXX"},function(){
    mqtt.connect();
  });
}

E.on('init', start);