置顶 mqant最全javascript客户端库(支持微信小程序,cocos2d,egret,layabox)
发布于 6 个月前 作者 liangdas 1672 次浏览 最后一次编辑是 1 个月前 来自 三方模块

mqtt.js发现有网络中断的情况,可能数据解析有bug cocos creator和H5可以优先使用 paho-mqtt.js
需要略微改造一点,下面是我改造好的,cocos creator可用 https://github.com/eclipse/paho.mqtt.javascript

MQTT.js是一个支持多种网络协议的mqtt库,支持Node.js 和 browser,在此基础支持我又新增了egret和layabox两种协议

目前MQTT.js支持库种类: tcp tls(ssl) ws (cocos2d,H5) wss wx (微信小程序/小游戏) wxs egret egrets laya layas

引用库

https://github.com/liangdas/MQTT.js/blob/master/browserMqtt.js 游戏开发的中可以直接在html中引用这个已编译好的库

测试示例

https://github.com/liangdas/MQTT.js/blob/master/examples/mqtt.html

cocos 微信小程序

cocos 和 微信小程序可以用umd库的方式引用mqtt库 https://github.com/liangdas/MQTT.js/blob/master/umdMqtt.js

注意事项

//不能直接传json,mqtt.js库没有自动转义 // client.publish(‘Login/HD_Login/1’, { // userName: ‘mqtt’, // passWord: ‘Hello,anyone!’ // });

8 回复

egret中如何使用

var client = mqtt.connect(“egret://127.0.0.1:3653”,{ protocolId: ‘MQIsdp’, protocolVersion: 3, clientId:‘mqttjs_’ + Math.random().toString(16).substr(2, 8), reconnectPeriod:0, //不自动重连 }) // you add a ws:// url here

借串一问,我想在cocos creater 连接 mqant的server,一直没办法成功,能不能提示一下简单的范例,感谢!

用这个库 https://github.com/liangdas/MQTT.js/blob/master/umdMqtt.js

QB20180424-1.png

	var mqtt=require("../Lib/umdMqtt");
  var cfg = {
	  load: function () {
		  console.log('mqtt')
		  var client = mqtt.connect("ws://127.0.0.1:3653",{
			  
		  //var client = mqtt.connect("egret://127.0.0.1:3653",{
		  //var client = mqtt.connect("laya://127.0.0.1:3653",{
			  protocolId: 'MQIsdp',
			  protocolVersion: 3,
			  clientId:'mqttjs_' + Math.random().toString(16).substr(2, 8),
			  reconnectPeriod:0, //不自动重连
		  }) // you add a ws:// url here
		  client.sendMessage=function  (msgid,body) {
			  //发送数据
			  //这里是发送消息给服务端,可以先将 msgid 转 topic
			  client.publish("Login/HD_Login/1", body)
		  }.bind(client);
		  client.on("message", function (topic, payload) {
			  console.log([topic, payload].join(": "))
			  //这里可以将 topic 转成 msgid 传给上一级代码
			  //client.end()
		  })
		  client.on('connect', function () {
			  //连接成功了,这里可以进行登陆操作
			  console.log('connect')
			  client.sendMessage(3001,"{\"userName\":\"xxxxx\", \"passWord\":\"123456\"}")
		  })
		  client.on('reconnect', function () {
			  //当一个重连开始
		  })
		  client.on('close', function () {
			  console.log('close')
		  })
		  client.on('error', function () {
			  console.log('error')
			  console.log(arguments)
		  })
	  }
  };
  
  module.exports = cfg;

想问,客户端用Cocos Creator开发的,用了umdMqtt来通信,web端与原生端都可以用,就是运行到微信小游戏时会出现问题。在小游戏模拟器会连不服务器,小游戏真机会出现错误黑屏。怎么解决问题呢?

可以用 paho-mqtt.js 需要略微改造一点,下面是我改造好的,cocos creator可用 https://github.com/eclipse/paho.mqtt.javascript

  /*******************************************************************************
   * Copyright (c) 2013 IBM Corp.
   *
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * and Eclipse Distribution License v1.0 which accompany this distribution.
   *
   * The Eclipse Public License is available at
   *    http://www.eclipse.org/legal/epl-v10.html
   * and the Eclipse Distribution License is available at
   *   http://www.eclipse.org/org/documents/edl-v10.php.
   *
   * Contributors:
   *    Andrew Banks - initial API and implementation and initial documentation
   *******************************************************************************/
  
  
  // Only expose a single object name in the global namespace.
  // Everything must go through this module. Global Paho.MQTT module
  // only has a single public function, client, which returns
  // a Paho.MQTT client object given connection details.
  
  /**
   * Send and receive messages using web browsers.
   * <p>
   * This programming interface lets a JavaScript client application use the MQTT V3.1 or
   * V3.1.1 protocol to connect to an MQTT-supporting messaging server.
   *
   * The function supported includes:
   * <ol>
   * <li>Connecting to and disconnecting from a server. The server is identified by its host name and port number.
   * <li>Specifying options that relate to the communications link with the server,
   * for example the frequency of keep-alive heartbeats, and whether SSL/TLS is required.
   * <li>Subscribing to and receiving messages from MQTT Topics.
   * <li>Publishing messages to MQTT Topics.
   * </ol>
   * <p>
   * The API consists of two main objects:
   * <dl>
   * <dt><b>{[@link](/user/link) Paho.MQTT.Client}</b></dt>
   * <dd>This contains methods that provide the functionality of the API,
   * including provision of callbacks that notify the application when a message
   * arrives from or is delivered to the messaging server,
   * or when the status of its connection to the messaging server changes.</dd>
   * <dt><b>{[@link](/user/link) Paho.MQTT.Message}</b></dt>
   * <dd>This encapsulates the payload of the message along with various attributes
   * associated with its delivery, in particular the destination to which it has
   * been (or is about to be) sent.</dd>
   * </dl>
   * <p>
   * The programming interface validates parameters passed to it, and will throw
   * an Error containing an error message intended for developer use, if it detects
   * an error with any parameter.
   * <p>
   * Example:
   *
   * <code><pre>
  client = new Paho.MQTT.Client(location.hostname, Number(location.port), "clientId");
  client.onConnectionLost = onConnectionLost;
  client.onMessageArrived = onMessageArrived;
  client.connect({onSuccess:onConnect});
  
  function onConnect() {
	// Once a connection has been made, make a subscription and send a message.
	console.log("onConnect");
	client.subscribe("/World");
	message = new Paho.MQTT.Message("Hello");
	message.destinationName = "/World";
	client.send(message);
  };
  function onConnectionLost(responseObject) {
	if (responseObject.errorCode !== 0)
	  console.log("onConnectionLost:"+responseObject.errorMessage);
  };
  function onMessageArrived(message) {
	console.log("onMessageArrived:"+message.payloadString);
	client.disconnect();
  };
   * </pre></code>
   * [@namespace](/user/namespace) Paho.MQTT
   */
  
  /* jshint shadow:true */
  (function ExportLibrary(root, factory) {
	  if(typeof exports === 'object' && typeof module === 'object'){
		  module.exports = factory();
	  } else if (typeof define === 'function' && define.amd){
		  define(factory);
	  } else if (typeof exports === 'object'){
		  exports = factory();
	  } else {
		  if (typeof root.Paho === 'undefined'){
			  root.Paho = {};
		  }
		  root.Paho.MQTT = factory();
	  }
  })(this, function LibraryFactory(){
  
  
  var PahoMQTT = (function (global) {
  
	  // Private variables below, these are only visible inside the function closure
	  // which is used to define the module.
  
	  var version = "[@VERSION](/user/VERSION)@";
	  var buildLevel = "[@BUILDLEVEL](/user/BUILDLEVEL)@";
  
	  /**
	   * Unique message type identifiers, with associated
	   * associated integer values.
	   * [@private](/user/private)
	   */
	  var MESSAGE_TYPE = {
		  CONNECT: 1,
		  CONNACK: 2,
		  PUBLISH: 3,
		  PUBACK: 4,
		  PUBREC: 5,
		  PUBREL: 6,
		  PUBCOMP: 7,
		  SUBSCRIBE: 8,
		  SUBACK: 9,
		  UNSUBSCRIBE: 10,
		  UNSUBACK: 11,
		  PINGREQ: 12,
		  PINGRESP: 13,
		  DISCONNECT: 14
	  };
  
	  // Collection of utility methods used to simplify module code
	  // and promote the DRY pattern.
  
	  /**
	   * Validate an object's parameter names to ensure they
	   * match a list of expected variables name for this option
	   * type. Used to ensure option object passed into the API don't
	   * contain erroneous parameters.
	   * [@param](/user/param) {Object} obj - User options object
	   * [@param](/user/param) {Object} keys - valid keys and types that may exist in obj.
	   * [@throws](/user/throws) {Error} Invalid option parameter found.
	   * [@private](/user/private)
	   */
	  var validate = function(obj, keys) {
		  for (var key in obj) {
			  if (obj.hasOwnProperty(key)) {
				  if (keys.hasOwnProperty(key)) {
					  if (typeof obj[key] !== keys[key])
						 throw new Error(format(ERROR.INVALID_TYPE, [typeof obj[key], key]));
				  } else {
					  var errorStr = "Unknown property, " + key + ". Valid properties are:";
					  for (var validKey in keys)
						  if (keys.hasOwnProperty(validKey))
							  errorStr = errorStr+" "+validKey;
					  throw new Error(errorStr);
				  }
			  }
		  }
	  };
  
	  /**
	   * Return a new function which runs the user function bound
	   * to a fixed scope.
	   * [@param](/user/param) {function} User function
	   * [@param](/user/param) {object} Function scope
	   * [@return](/user/return) {function} User function bound to another scope
	   * [@private](/user/private)
	   */
	  var scope = function (f, scope) {
		  return function () {
			  return f.apply(scope, arguments);
		  };
	  };
  
	  /**
	   * Unique message type identifiers, with associated
	   * associated integer values.
	   * [@private](/user/private)
	   */
	  var ERROR = {
		  OK: {code:0, text:"AMQJSC0000I OK."},
		  CONNECT_TIMEOUT: {code:1, text:"AMQJSC0001E Connect timed out."},
		  SUBSCRIBE_TIMEOUT: {code:2, text:"AMQJS0002E Subscribe timed out."},
		  UNSUBSCRIBE_TIMEOUT: {code:3, text:"AMQJS0003E Unsubscribe timed out."},
		  PING_TIMEOUT: {code:4, text:"AMQJS0004E Ping timed out."},
		  INTERNAL_ERROR: {code:5, text:"AMQJS0005E Internal error. Error Message: {0}, Stack trace: {1}"},
		  CONNACK_RETURNCODE: {code:6, text:"AMQJS0006E Bad Connack return code:{0} {1}."},
		  SOCKET_ERROR: {code:7, text:"AMQJS0007E Socket error:{0}."},
		  SOCKET_CLOSE: {code:8, text:"AMQJS0008I Socket closed."},
		  MALFORMED_UTF: {code:9, text:"AMQJS0009E Malformed UTF data:{0} {1} {2}."},
		  UNSUPPORTED: {code:10, text:"AMQJS0010E {0} is not supported by this browser."},
		  INVALID_STATE: {code:11, text:"AMQJS0011E Invalid state {0}."},
		  INVALID_TYPE: {code:12, text:"AMQJS0012E Invalid type {0} for {1}."},
		  INVALID_ARGUMENT: {code:13, text:"AMQJS0013E Invalid argument {0} for {1}."},
		  UNSUPPORTED_OPERATION: {code:14, text:"AMQJS0014E Unsupported operation."},
		  INVALID_STORED_DATA: {code:15, text:"AMQJS0015E Invalid data in local storage key={0} value={1}."},
		  INVALID_MQTT_MESSAGE_TYPE: {code:16, text:"AMQJS0016E Invalid MQTT message type {0}."},
		  MALFORMED_UNICODE: {code:17, text:"AMQJS0017E Malformed Unicode string:{0} {1}."},
		  BUFFER_FULL: {code:18, text:"AMQJS0018E Message buffer is full, maximum buffer size: {0}."},
	  };
  
	  /** CONNACK RC Meaning. */
	  var CONNACK_RC = {
		  0:"Connection Accepted",
		  1:"Connection Refused: unacceptable protocol version",
		  2:"Connection Refused: identifier rejected",
		  3:"Connection Refused: server unavailable",
		  4:"Connection Refused: bad user name or password",
		  5:"Connection Refused: not authorized"
	  };
  
	  /**
	   * Format an error message text.
	   * [@private](/user/private)
	   * [@param](/user/param) {error} ERROR.KEY value above.
	   * [@param](/user/param) {substitutions} [array] substituted into the text.
	   * [@return](/user/return) the text with the substitutions made.
	   */
	  var format = function(error, substitutions) {
		  var text = error.text;
		  if (substitutions) {
			var field,start;
			for (var i=0; i<substitutions.length; i++) {
			  field = "{"+i+"}";
			  start = text.indexOf(field);
			  if(start > 0) {
				  var part1 = text.substring(0,start);
				  var part2 = text.substring(start+field.length);
				  text = part1+substitutions[i]+part2;
			  }
			}
		  }
		  return text;
	  };
  
	  //MQTT protocol and version          6    M    Q    I    s    d    p    3
	  var MqttProtoIdentifierv3 = [0x00,0x06,0x4d,0x51,0x49,0x73,0x64,0x70,0x03];
	  //MQTT proto/version for 311         4    M    Q    T    T    4
	  var MqttProtoIdentifierv4 = [0x00,0x04,0x4d,0x51,0x54,0x54,0x04];
  
	  /**
	   * Construct an MQTT wire protocol message.
	   * [@param](/user/param) type MQTT packet type.
	   * [@param](/user/param) options optional wire message attributes.
	   *
	   * Optional properties
	   *
	   * messageIdentifier: message ID in the range [0..65535]
	   * payloadMessage:	Application Message - PUBLISH only
	   * connectStrings:	array of 0 or more Strings to be put into the CONNECT payload
	   * topics:			array of strings (SUBSCRIBE, UNSUBSCRIBE)
	   * requestQoS:		array of QoS values [0..2]
	   *
	   * "Flag" properties
	   * cleanSession:	true if present / false if absent (CONNECT)
	   * willMessage:  	true if present / false if absent (CONNECT)
	   * isRetained:		true if present / false if absent (CONNECT)
	   * userName:		true if present / false if absent (CONNECT)
	   * password:		true if present / false if absent (CONNECT)
	   * keepAliveInterval:	integer [0..65535]  (CONNECT)
	   *
	   * [@private](/user/private)
	   * [@ignore](/user/ignore)
	   */
	  var WireMessage = function (type, options) {
		  this.type = type;
		  for (var name in options) {
			  if (options.hasOwnProperty(name)) {
				  this[name] = options[name];
			  }
		  }
	  };
  
	  WireMessage.prototype.encode = function() {
		  // Compute the first byte of the fixed header
		  var first = ((this.type & 0x0f) << 4);
  
		  /*
		   * Now calculate the length of the variable header + payload by adding up the lengths
		   * of all the component parts
		   */
  
		  var remLength = 0;
		  var topicStrLength = [];
		  var destinationNameLength = 0;
		  var willMessagePayloadBytes;
  
		  // if the message contains a messageIdentifier then we need two bytes for that
		  if (this.messageIdentifier !== undefined)
			  remLength += 2;
  
		  switch(this.type) {
			  // If this a Connect then we need to include 12 bytes for its header
			  case MESSAGE_TYPE.CONNECT:
				  switch(this.mqttVersion) {
					  case 3:
						  remLength += MqttProtoIdentifierv3.length + 3;
						  break;
					  case 4:
						  remLength += MqttProtoIdentifierv4.length + 3;
						  break;
				  }
  
				  remLength += UTF8Length(this.clientId) + 2;
				  if (this.willMessage !== undefined) {
					  remLength += UTF8Length(this.willMessage.destinationName) + 2;
					  // Will message is always a string, sent as UTF-8 characters with a preceding length.
					  willMessagePayloadBytes = this.willMessage.payloadBytes;
					  if (!(willMessagePayloadBytes instanceof Uint8Array))
						  willMessagePayloadBytes = new Uint8Array(payloadBytes);
					  remLength += willMessagePayloadBytes.byteLength +2;
				  }
				  if (this.userName !== undefined)
					  remLength += UTF8Length(this.userName) + 2;
				  if (this.password !== undefined)
					  remLength += UTF8Length(this.password) + 2;
			  break;
  
			  // Subscribe, Unsubscribe can both contain topic strings
			  case MESSAGE_TYPE.SUBSCRIBE:
				  first |= 0x02; // Qos = 1;
				  for ( var i = 0; i < this.topics.length; i++) {
					  topicStrLength[i] = UTF8Length(this.topics[i]);
					  remLength += topicStrLength[i] + 2;
				  }
				  remLength += this.requestedQos.length; // 1 byte for each topic's Qos
				  // QoS on Subscribe only
				  break;
  
			  case MESSAGE_TYPE.UNSUBSCRIBE:
				  first |= 0x02; // Qos = 1;
				  for ( var i = 0; i < this.topics.length; i++) {
					  topicStrLength[i] = UTF8Length(this.topics[i]);
					  remLength += topicStrLength[i] + 2;
				  }
				  break;
  
			  case MESSAGE_TYPE.PUBREL:
				  first |= 0x02; // Qos = 1;
				  break;
  
			  case MESSAGE_TYPE.PUBLISH:
				  if (this.payloadMessage.duplicate) first |= 0x08;
				  first  = first |= (this.payloadMessage.qos << 1);
				  if (this.payloadMessage.retained) first |= 0x01;
				  destinationNameLength = UTF8Length(this.payloadMessage.destinationName);
				  remLength += destinationNameLength + 2;
				  var payloadBytes = this.payloadMessage.payloadBytes;
				  remLength += payloadBytes.byteLength;
				  if (payloadBytes instanceof ArrayBuffer)
					  payloadBytes = new Uint8Array(payloadBytes);
				  else if (!(payloadBytes instanceof Uint8Array))
					  payloadBytes = new Uint8Array(payloadBytes.buffer);
				  break;
  
			  case MESSAGE_TYPE.DISCONNECT:
				  break;
  
			  default:
				  break;
		  }
  
		  // Now we can allocate a buffer for the message
  
		  var mbi = encodeMBI(remLength);  // Convert the length to MQTT MBI format
		  var pos = mbi.length + 1;        // Offset of start of variable header
		  var buffer = new ArrayBuffer(remLength + pos);
		  var byteStream = new Uint8Array(buffer);    // view it as a sequence of bytes
  
		  //Write the fixed header into the buffer
		  byteStream[0] = first;
		  byteStream.set(mbi,1);
  
		  // If this is a PUBLISH then the variable header starts with a topic
		  if (this.type == MESSAGE_TYPE.PUBLISH)
			  pos = writeString(this.payloadMessage.destinationName, destinationNameLength, byteStream, pos);
		  // If this is a CONNECT then the variable header contains the protocol name/version, flags and keepalive time
  
		  else if (this.type == MESSAGE_TYPE.CONNECT) {
			  switch (this.mqttVersion) {
				  case 3:
					  byteStream.set(MqttProtoIdentifierv3, pos);
					  pos += MqttProtoIdentifierv3.length;
					  break;
				  case 4:
					  byteStream.set(MqttProtoIdentifierv4, pos);
					  pos += MqttProtoIdentifierv4.length;
					  break;
			  }
			  var connectFlags = 0;
			  if (this.cleanSession)
				  connectFlags = 0x02;
			  if (this.willMessage !== undefined ) {
				  connectFlags |= 0x04;
				  connectFlags |= (this.willMessage.qos<<3);
				  if (this.willMessage.retained) {
					  connectFlags |= 0x20;
				  }
			  }
			  if (this.userName !== undefined)
				  connectFlags |= 0x80;
			  if (this.password !== undefined)
				  connectFlags |= 0x40;
			  byteStream[pos++] = connectFlags;
			  pos = writeUint16 (this.keepAliveInterval, byteStream, pos);
		  }
  
		  // Output the messageIdentifier - if there is one
		  if (this.messageIdentifier !== undefined)
			  pos = writeUint16 (this.messageIdentifier, byteStream, pos);
  
		  switch(this.type) {
			  case MESSAGE_TYPE.CONNECT:
				  pos = writeString(this.clientId, UTF8Length(this.clientId), byteStream, pos);
				  if (this.willMessage !== undefined) {
					  pos = writeString(this.willMessage.destinationName, UTF8Length(this.willMessage.destinationName), byteStream, pos);
					  pos = writeUint16(willMessagePayloadBytes.byteLength, byteStream, pos);
					  byteStream.set(willMessagePayloadBytes, pos);
					  pos += willMessagePayloadBytes.byteLength;
  
				  }
			  if (this.userName !== undefined)
				  pos = writeString(this.userName, UTF8Length(this.userName), byteStream, pos);
			  if (this.password !== undefined)
				  pos = writeString(this.password, UTF8Length(this.password), byteStream, pos);
			  break;
  
			  case MESSAGE_TYPE.PUBLISH:
				  // PUBLISH has a text or binary payload, if text do not add a 2 byte length field, just the UTF characters.
				  byteStream.set(payloadBytes, pos);
  
				  break;
  
  //    	    case MESSAGE_TYPE.PUBREC:
  //    	    case MESSAGE_TYPE.PUBREL:
  //    	    case MESSAGE_TYPE.PUBCOMP:
  //    	    	break;
  
			  case MESSAGE_TYPE.SUBSCRIBE:
				  // SUBSCRIBE has a list of topic strings and request QoS
				  for (var i=0; i<this.topics.length; i++) {
					  pos = writeString(this.topics[i], topicStrLength[i], byteStream, pos);
					  byteStream[pos++] = this.requestedQos[i];
				  }
				  break;
  
			  case MESSAGE_TYPE.UNSUBSCRIBE:
				  // UNSUBSCRIBE has a list of topic strings
				  for (var i=0; i<this.topics.length; i++)
					  pos = writeString(this.topics[i], topicStrLength[i], byteStream, pos);
				  break;
  
			  default:
				  // Do nothing.
		  }
  
		  return buffer;
	  };
  
	  function decodeMessage(input,pos) {
		  var startingPos = pos;
		  var first = input[pos];
		  var type = first >> 4;
		  var messageInfo = first &= 0x0f;
		  pos += 1;
  
  
		  // Decode the remaining length (MBI format)
  
		  var digit;
		  var remLength = 0;
		  var multiplier = 1;
		  do {
			  if (pos == input.length) {
				  return [null,startingPos];
			  }
			  digit = input[pos++];
			  remLength += ((digit & 0x7F) * multiplier);
			  multiplier *= 128;
		  } while ((digit & 0x80) !== 0);
  
		  var endPos = pos+remLength;
		  if (endPos > input.length) {
			  return [null,startingPos];
		  }
  
		  var wireMessage = new WireMessage(type);
		  switch(type) {
			  case MESSAGE_TYPE.CONNACK:
				  var connectAcknowledgeFlags = input[pos++];
				  if (connectAcknowledgeFlags & 0x01)
					  wireMessage.sessionPresent = true;
				  wireMessage.returnCode = input[pos++];
				  break;
  
			  case MESSAGE_TYPE.PUBLISH:
				  var qos = (messageInfo >> 1) & 0x03;
  
				  var len = readUint16(input, pos);
				  pos += 2;
				  var topicName = parseUTF8(input, pos, len);
				  pos += len;
				  // If QoS 1 or 2 there will be a messageIdentifier
				  if (qos > 0) {
					  wireMessage.messageIdentifier = readUint16(input, pos);
					  pos += 2;
				  }
  
				  var message = new Message(input.subarray(pos, endPos));
				  if ((messageInfo & 0x01) == 0x01)
					  message.retained = true;
				  if ((messageInfo & 0x08) == 0x08)
					  message.duplicate =  true;
				  message.qos = qos;
				  message.destinationName = topicName;
				  wireMessage.payloadMessage = message;
				  break;
  
			  case  MESSAGE_TYPE.PUBACK:
			  case  MESSAGE_TYPE.PUBREC:
			  case  MESSAGE_TYPE.PUBREL:
			  case  MESSAGE_TYPE.PUBCOMP:
			  case  MESSAGE_TYPE.UNSUBACK:
				  wireMessage.messageIdentifier = readUint16(input, pos);
				  break;
  
			  case  MESSAGE_TYPE.SUBACK:
				  wireMessage.messageIdentifier = readUint16(input, pos);
				  pos += 2;
				  wireMessage.returnCode = input.subarray(pos, endPos);
				  break;
  
			  default:
				  break;
		  }
  
		  return [wireMessage,endPos];
	  }
  
	  function writeUint16(input, buffer, offset) {
		  buffer[offset++] = input >> 8;      //MSB
		  buffer[offset++] = input % 256;     //LSB
		  return offset;
	  }
  
	  function writeString(input, utf8Length, buffer, offset) {
		  offset = writeUint16(utf8Length, buffer, offset);
		  stringToUTF8(input, buffer, offset);
		  return offset + utf8Length;
	  }
  
	  function readUint16(buffer, offset) {
		  return 256*buffer[offset] + buffer[offset+1];
	  }
  
	  /**
	   * Encodes an MQTT Multi-Byte Integer
	   * [@private](/user/private)
	   */
	  function encodeMBI(number) {
		  var output = new Array(1);
		  var numBytes = 0;
  
		  do {
			  var digit = number % 128;
			  number = number >> 7;
			  if (number > 0) {
				  digit |= 0x80;
			  }
			  output[numBytes++] = digit;
		  } while ( (number > 0) && (numBytes<4) );
  
		  return output;
	  }
  
	  /**
	   * Takes a String and calculates its length in bytes when encoded in UTF8.
	   * [@private](/user/private)
	   */
	  function UTF8Length(input) {
		  var output = 0;
		  for (var i = 0; i<input.length; i++)
		  {
			  var charCode = input.charCodeAt(i);
				  if (charCode > 0x7FF)
					 {
						// Surrogate pair means its a 4 byte character
						if (0xD800 <= charCode && charCode <= 0xDBFF)
						  {
							i++;
							output++;
						  }
					 output +=3;
					 }
			  else if (charCode > 0x7F)
				  output +=2;
			  else
				  output++;
		  }
		  return output;
	  }
  
	  /**
	   * Takes a String and writes it into an array as UTF8 encoded bytes.
	   * [@private](/user/private)
	   */
	  function stringToUTF8(input, output, start) {
		  var pos = start;
		  for (var i = 0; i<input.length; i++) {
			  var charCode = input.charCodeAt(i);
  
			  // Check for a surrogate pair.
			  if (0xD800 <= charCode && charCode <= 0xDBFF) {
				  var lowCharCode = input.charCodeAt(++i);
				  if (isNaN(lowCharCode)) {
					  throw new Error(format(ERROR.MALFORMED_UNICODE, [charCode, lowCharCode]));
				  }
				  charCode = ((charCode - 0xD800)<<10) + (lowCharCode - 0xDC00) + 0x10000;
  
			  }
  
			  if (charCode <= 0x7F) {
				  output[pos++] = charCode;
			  } else if (charCode <= 0x7FF) {
				  output[pos++] = charCode>>6  & 0x1F | 0xC0;
				  output[pos++] = charCode     & 0x3F | 0x80;
			  } else if (charCode <= 0xFFFF) {
				  output[pos++] = charCode>>12 & 0x0F | 0xE0;
				  output[pos++] = charCode>>6  & 0x3F | 0x80;
				  output[pos++] = charCode     & 0x3F | 0x80;
			  } else {
				  output[pos++] = charCode>>18 & 0x07 | 0xF0;
				  output[pos++] = charCode>>12 & 0x3F | 0x80;
				  output[pos++] = charCode>>6  & 0x3F | 0x80;
				  output[pos++] = charCode     & 0x3F | 0x80;
			  }
		  }
		  return output;
	  }
  
	  function parseUTF8(input, offset, length) {
		  var output = "";
		  var utf16;
		  var pos = offset;
  
		  while (pos < offset+length)
		  {
			  var byte1 = input[pos++];
			  if (byte1 < 128)
				  utf16 = byte1;
			  else
			  {
				  var byte2 = input[pos++]-128;
				  if (byte2 < 0)
					  throw new Error(format(ERROR.MALFORMED_UTF, [byte1.toString(16), byte2.toString(16),""]));
				  if (byte1 < 0xE0)             // 2 byte character
					  utf16 = 64*(byte1-0xC0) + byte2;
				  else
				  {
					  var byte3 = input[pos++]-128;
					  if (byte3 < 0)
						  throw new Error(format(ERROR.MALFORMED_UTF, [byte1.toString(16), byte2.toString(16), byte3.toString(16)]));
					  if (byte1 < 0xF0)        // 3 byte character
						  utf16 = 4096*(byte1-0xE0) + 64*byte2 + byte3;
								  else
								  {
									 var byte4 = input[pos++]-128;
									 if (byte4 < 0)
						  throw new Error(format(ERROR.MALFORMED_UTF, [byte1.toString(16), byte2.toString(16), byte3.toString(16), byte4.toString(16)]));
									 if (byte1 < 0xF8)        // 4 byte character
											 utf16 = 262144*(byte1-0xF0) + 4096*byte2 + 64*byte3 + byte4;
						 else                     // longer encodings are not supported
						  throw new Error(format(ERROR.MALFORMED_UTF, [byte1.toString(16), byte2.toString(16), byte3.toString(16), byte4.toString(16)]));
								  }
				  }
			  }
  
				  if (utf16 > 0xFFFF)   // 4 byte character - express as a surrogate pair
					{
					   utf16 -= 0x10000;
					   output += String.fromCharCode(0xD800 + (utf16 >> 10)); // lead character
					   utf16 = 0xDC00 + (utf16 & 0x3FF);  // trail character
					}
			  output += String.fromCharCode(utf16);
		  }
		  return output;
	  }
  
	  /**
	   * Repeat keepalive requests, monitor responses.
	   * [@ignore](/user/ignore)
	   */
	  var Pinger = function(client, window, keepAliveInterval) {
		  this._client = client;
		  this._window = window;
		  this._keepAliveInterval = keepAliveInterval*1000;
		  this.isReset = false;
  
		  var pingReq = new WireMessage(MESSAGE_TYPE.PINGREQ).encode();
  
		  var doTimeout = function (pinger) {
			  return function () {
				  return doPing.apply(pinger);
			  };
		  };
  
		  /** [@ignore](/user/ignore) */
		  var doPing = function() {
			  if (!this.isReset) {
				  this._client._trace("Pinger.doPing", "Timed out");
				  this._client._disconnected( ERROR.PING_TIMEOUT.code , format(ERROR.PING_TIMEOUT));
			  } else {
				  this.isReset = false;
				  this._client._trace("Pinger.doPing", "send PINGREQ");
				  this._client.socket.send(pingReq);
				  this.timeout = this._window.setTimeout(doTimeout(this), this._keepAliveInterval);
			  }
		  };
  
		  this.reset = function() {
			  this.isReset = true;
			  this._window.clearTimeout(this.timeout);
			  if (this._keepAliveInterval > 0)
				  this.timeout = setTimeout(doTimeout(this), this._keepAliveInterval);
		  };
  
		  this.cancel = function() {
			  this._window.clearTimeout(this.timeout);
		  };
	   };
  
	  /**
	   * Monitor request completion.
	   * [@ignore](/user/ignore)
	   */
	  var Timeout = function(client, window, timeoutSeconds, action, args) {
		  this._window = window;
		  if (!timeoutSeconds)
			  timeoutSeconds = 30;
  
		  var doTimeout = function (action, client, args) {
			  return function () {
				  return action.apply(client, args);
			  };
		  };
		  this.timeout = setTimeout(doTimeout(action, client, args), timeoutSeconds * 1000);
  
		  this.cancel = function() {
			  this._window.clearTimeout(this.timeout);
		  };
	  };
  
	  /*
	   * Internal implementation of the Websockets MQTT V3.1 client.
	   *
	   * [@name](/user/name) Paho.MQTT.ClientImpl [@constructor](/user/constructor)
	   * [@param](/user/param) {String} host the DNS nameof the webSocket host.
	   * [@param](/user/param) {Number} port the port number for that host.
	   * [@param](/user/param) {String} clientId the MQ client identifier.
	   */
	  var ClientImpl = function (uri, host, port, path, clientId) {
		  // Check dependencies are satisfied in this browser.
		  if (!("WebSocket" in global && global.WebSocket !== null)) {
			  throw new Error(format(ERROR.UNSUPPORTED, ["WebSocket"]));
		  }
		  if (!("localStorage" in global && global.localStorage !== null)) {
			  throw new Error(format(ERROR.UNSUPPORTED, ["localStorage"]));
		  }
		  if (!("ArrayBuffer" in global && global.ArrayBuffer !== null)) {
			  throw new Error(format(ERROR.UNSUPPORTED, ["ArrayBuffer"]));
		  }
		  this._trace("Paho.MQTT.Client", uri, host, port, path, clientId);
  
		  this.host = host;
		  this.port = port;
		  this.path = path;
		  this.uri = uri;
		  this.clientId = clientId;
		  this._wsuri = null;
  
		  // Local storagekeys are qualified with the following string.
		  // The conditional inclusion of path in the key is for backward
		  // compatibility to when the path was not configurable and assumed to
		  // be /mqtt
		  this._localKey=host+":"+port+(path!="/mqtt"?":"+path:"")+":"+clientId+":";
  
		  // Create private instance-only message queue
		  // Internal queue of messages to be sent, in sending order.
		  this._msg_queue = [];
		  this._buffered_msg_queue = [];
  
		  // Messages we have sent and are expecting a response for, indexed by their respective message ids.
		  this._sentMessages = {};
  
		  // Messages we have received and acknowleged and are expecting a confirm message for
		  // indexed by their respective message ids.
		  this._receivedMessages = {};
  
		  // Internal list of callbacks to be executed when messages
		  // have been successfully sent over web socket, e.g. disconnect
		  // when it doesn't have to wait for ACK, just message is dispatched.
		  this._notify_msg_sent = {};
  
		  // Unique identifier for SEND messages, incrementing
		  // counter as messages are sent.
		  this._message_identifier = 1;
  
		  // Used to determine the transmission sequence of stored sent messages.
		  this._sequence = 0;
  
  
		  // Load the local state, if any, from the saved version, only restore state relevant to this client.
		  for (var key in localStorage)
			  if (   key.indexOf("Sent:"+this._localKey) === 0 || key.indexOf("Received:"+this._localKey) === 0)
			  this.restore(key);
	  };
  
	  // Messaging Client public instance members.
	  ClientImpl.prototype.host = null;
	  ClientImpl.prototype.port = null;
	  ClientImpl.prototype.path = null;
	  ClientImpl.prototype.uri = null;
	  ClientImpl.prototype.clientId = null;
  
	  // Messaging Client private instance members.
	  ClientImpl.prototype.socket = null;
	  /* true once we have received an acknowledgement to a CONNECT packet. */
	  ClientImpl.prototype.connected = false;
	  /* The largest message identifier allowed, may not be larger than 2**16 but
	   * if set smaller reduces the maximum number of outbound messages allowed.
	   */
	  ClientImpl.prototype.maxMessageIdentifier = 65536;
	  ClientImpl.prototype.connectOptions = null;
	  ClientImpl.prototype.hostIndex = null;
	  ClientImpl.prototype.onConnected = null;
	  ClientImpl.prototype.onConnectionLost = null;
	  ClientImpl.prototype.onMessageDelivered = null;
	  ClientImpl.prototype.onMessageArrived = null;
	  ClientImpl.prototype.traceFunction = null;
	  ClientImpl.prototype._msg_queue = null;
	  ClientImpl.prototype._buffered_msg_queue = null;
	  ClientImpl.prototype._connectTimeout = null;
	  /* The sendPinger monitors how long we allow before we send data to prove to the server that we are alive. */
	  ClientImpl.prototype.sendPinger = null;
	  /* The receivePinger monitors how long we allow before we require evidence that the server is alive. */
	  ClientImpl.prototype.receivePinger = null;
	  ClientImpl.prototype._reconnectInterval = 1; // Reconnect Delay, starts at 1 second
	  ClientImpl.prototype._reconnecting = false;
	  ClientImpl.prototype._reconnectTimeout = null;
	  ClientImpl.prototype.disconnectedPublishing = false;
	  ClientImpl.prototype.disconnectedBufferSize = 5000;
  
	  ClientImpl.prototype.receiveBuffer = null;
  
	  ClientImpl.prototype._traceBuffer = null;
	  ClientImpl.prototype._MAX_TRACE_ENTRIES = 100;
  
	  ClientImpl.prototype.connect = function (connectOptions) {
		  var connectOptionsMasked = this._traceMask(connectOptions, "password");
		  this._trace("Client.connect", connectOptionsMasked, this.socket, this.connected);
  
		  if (this.connected)
			  throw new Error(format(ERROR.INVALID_STATE, ["already connected"]));
		  if (this.socket)
			  throw new Error(format(ERROR.INVALID_STATE, ["already connected"]));
  
		  if (this._reconnecting) {
			  // connect() function is called while reconnect is in progress.
			  // Terminate the auto reconnect process to use new connect options.
			  this._reconnectTimeout.cancel();
			  this._reconnectTimeout = null;
			  this._reconnecting = false;
		  }
  
		  this.connectOptions = connectOptions;
		  this._reconnectInterval = 1;
		  this._reconnecting = false;
		  if (connectOptions.uris) {
			  this.hostIndex = 0;
			  this._doConnect(connectOptions.uris[0]);
		  } else {
			  this._doConnect(this.uri);
		  }
  
	  };
  
	  ClientImpl.prototype.subscribe = function (filter, subscribeOptions) {
		  this._trace("Client.subscribe", filter, subscribeOptions);
  
		  if (!this.connected)
			  throw new Error(format(ERROR.INVALID_STATE, ["not connected"]));
  
		  var wireMessage = new WireMessage(MESSAGE_TYPE.SUBSCRIBE);
		  wireMessage.topics=[filter];
		  if (subscribeOptions.qos !== undefined)
			  wireMessage.requestedQos = [subscribeOptions.qos];
		  else
			  wireMessage.requestedQos = [0];
  
		  if (subscribeOptions.onSuccess) {
			  wireMessage.onSuccess = function(grantedQos) {subscribeOptions.onSuccess({invocationContext:subscribeOptions.invocationContext,grantedQos:grantedQos});};
		  }
  
		  if (subscribeOptions.onFailure) {
			  wireMessage.onFailure = function(errorCode) {subscribeOptions.onFailure({invocationContext:subscribeOptions.invocationContext,errorCode:errorCode, errorMessage:format(errorCode)});};
		  }
  
		  if (subscribeOptions.timeout) {
			  wireMessage.timeOut = new Timeout(this, window, subscribeOptions.timeout, subscribeOptions.onFailure,
						  [{invocationContext:subscribeOptions.invocationContext,
						  errorCode:ERROR.SUBSCRIBE_TIMEOUT.code,
						  errorMessage:format(ERROR.SUBSCRIBE_TIMEOUT)}]);
		  }
  
		  // All subscriptions return a SUBACK.
		  this._requires_ack(wireMessage);
		  this._schedule_message(wireMessage);
	  };
  
	  /** [@ignore](/user/ignore) */
	  ClientImpl.prototype.unsubscribe = function(filter, unsubscribeOptions) {
		  this._trace("Client.unsubscribe", filter, unsubscribeOptions);
  
		  if (!this.connected)
			 throw new Error(format(ERROR.INVALID_STATE, ["not connected"]));
  
		  var wireMessage = new WireMessage(MESSAGE_TYPE.UNSUBSCRIBE);
		  wireMessage.topics = [filter];
  
		  if (unsubscribeOptions.onSuccess) {
			  wireMessage.callback = function() {unsubscribeOptions.onSuccess({invocationContext:unsubscribeOptions.invocationContext});};
		  }
		  if (unsubscribeOptions.timeout) {
			  wireMessage.timeOut = new Timeout(this, window, unsubscribeOptions.timeout, unsubscribeOptions.onFailure,
						[{invocationContext:unsubscribeOptions.invocationContext,
						  errorCode:ERROR.UNSUBSCRIBE_TIMEOUT.code,
						  errorMessage:format(ERROR.UNSUBSCRIBE_TIMEOUT)}]);
		  }
  
		  // All unsubscribes return a SUBACK.
		  this._requires_ack(wireMessage);
		  this._schedule_message(wireMessage);
	  };
  
	  ClientImpl.prototype.send = function (message) {
		  this._trace("Client.send", message);
  
		  var wireMessage = new WireMessage(MESSAGE_TYPE.PUBLISH);
		  wireMessage.payloadMessage = message;
  
		  if (this.connected) {
			  // Mark qos 1 & 2 message as "ACK required"
			  // For qos 0 message, invoke onMessageDelivered callback if there is one.
			  // Then schedule the message.
			  if (message.qos > 0) {
			  this._requires_ack(wireMessage);
			  } else if (this.onMessageDelivered) {
			  this._notify_msg_sent[wireMessage] = this.onMessageDelivered(wireMessage.payloadMessage);
			  }
		  this._schedule_message(wireMessage);
		  } else {
			  // Currently disconnected, will not schedule this message
			  // Check if reconnecting is in progress and disconnected publish is enabled.
			  if (this._reconnecting && this.disconnectedPublishing) {
				  // Check the limit which include the "required ACK" messages
				  var messageCount = Object.keys(this._sentMessages).length + this._buffered_msg_queue.length;
				  if (messageCount > this.disconnectedBufferSize) {
					  throw new Error(format(ERROR.BUFFER_FULL, [this.disconnectedBufferSize]));
				  } else {
					  if (message.qos > 0) {
						  // Mark this message as "ACK required"
						  this._requires_ack(wireMessage);
					  } else {
						  wireMessage.sequence = ++this._sequence;
						  this._buffered_msg_queue.push(wireMessage);
					  }
				  }
			  } else {
				  throw new Error(format(ERROR.INVALID_STATE, ["not connected"]));
			  }
		  }
	  };
  
	  ClientImpl.prototype.disconnect = function () {
		  this._trace("Client.disconnect");
  
		  if (this._reconnecting) {
			  // disconnect() function is called while reconnect is in progress.
			  // Terminate the auto reconnect process.
			  this._reconnectTimeout.cancel();
			  this._reconnectTimeout = null;
			  this._reconnecting = false;
		  }
  
		  if (!this.socket)
			  throw new Error(format(ERROR.INVALID_STATE, ["not connecting or connected"]));
  
		  wireMessage = new WireMessage(MESSAGE_TYPE.DISCONNECT);
  
		  // Run the disconnected call back as soon as the message has been sent,
		  // in case of a failure later on in the disconnect processing.
		  // as a consequence, the _disconected call back may be run several times.
		  this._notify_msg_sent[wireMessage] = scope(this._disconnected, this);
  
		  this._schedule_message(wireMessage);
	  };
  
	  ClientImpl.prototype.getTraceLog = function () {
		  if ( this._traceBuffer !== null ) {
			  this._trace("Client.getTraceLog", new Date());
			  this._trace("Client.getTraceLog in flight messages", this._sentMessages.length);
			  for (var key in this._sentMessages)
				  this._trace("_sentMessages ",key, this._sentMessages[key]);
			  for (var key in this._receivedMessages)
				  this._trace("_receivedMessages ",key, this._receivedMessages[key]);
  
			  return this._traceBuffer;
		  }
	  };
  
	  ClientImpl.prototype.startTrace = function () {
		  if ( this._traceBuffer === null ) {
			  this._traceBuffer = [];
		  }
		  this._trace("Client.startTrace", new Date(), version);
	  };
  
	  ClientImpl.prototype.stopTrace = function () {
		  delete this._traceBuffer;
	  };
  
	  ClientImpl.prototype._doConnect = function (wsurl) {
		  // When the socket is open, this client will send the CONNECT WireMessage using the saved parameters.
		  if (this.connectOptions.useSSL) {
			  var uriParts = wsurl.split(":");
			  uriParts[0] = "wss";
			  wsurl = uriParts.join(":");
		  }
		  this._wsuri = wsurl;
		  this.connected = false;
  
  
  
		  if (this.connectOptions.mqttVersion < 4) {
			  this.socket = new WebSocket(wsurl, ["mqttv3.1"]);
		  } else {
			  this.socket = new WebSocket(wsurl, ["mqtt"]);
		  }
		  this.socket.binaryType = 'arraybuffer';
		  this.socket.onopen = scope(this._on_socket_open, this);
		  this.socket.onmessage = scope(this._on_socket_message, this);
		  this.socket.onerror = scope(this._on_socket_error, this);
		  this.socket.onclose = scope(this._on_socket_close, this);
  
		  this.sendPinger = new Pinger(this, window, this.connectOptions.keepAliveInterval);
		  this.receivePinger = new Pinger(this, window, this.connectOptions.keepAliveInterval);
		  if (this._connectTimeout) {
			  this._connectTimeout.cancel();
			  this._connectTimeout = null;
		  }
		  this._connectTimeout = new Timeout(this, window, this.connectOptions.timeout, this._disconnected,  [ERROR.CONNECT_TIMEOUT.code, format(ERROR.CONNECT_TIMEOUT)]);
	  };
  
  
	  // Schedule a new message to be sent over the WebSockets
	  // connection. CONNECT messages cause WebSocket connection
	  // to be started. All other messages are queued internally
	  // until this has happened. When WS connection starts, process
	  // all outstanding messages.
	  ClientImpl.prototype._schedule_message = function (message) {
		  this._msg_queue.push(message);
		  // Process outstanding messages in the queue if we have an  open socket, and have received CONNACK.
		  if (this.connected) {
			  this._process_queue();
		  }
	  };
  
	  ClientImpl.prototype.store = function(prefix, wireMessage) {
		  var storedMessage = {type:wireMessage.type, messageIdentifier:wireMessage.messageIdentifier, version:1};
  
		  switch(wireMessage.type) {
			case MESSAGE_TYPE.PUBLISH:
				if(wireMessage.pubRecReceived)
					storedMessage.pubRecReceived = true;
  
				// Convert the payload to a hex string.
				storedMessage.payloadMessage = {};
				var hex = "";
				var messageBytes = wireMessage.payloadMessage.payloadBytes;
				for (var i=0; i<messageBytes.length; i++) {
				  if (messageBytes[i] <= 0xF)
					hex = hex+"0"+messageBytes[i].toString(16);
				  else
					hex = hex+messageBytes[i].toString(16);
				}
				storedMessage.payloadMessage.payloadHex = hex;
  
				storedMessage.payloadMessage.qos = wireMessage.payloadMessage.qos;
				storedMessage.payloadMessage.destinationName = wireMessage.payloadMessage.destinationName;
				if (wireMessage.payloadMessage.duplicate)
					storedMessage.payloadMessage.duplicate = true;
				if (wireMessage.payloadMessage.retained)
					storedMessage.payloadMessage.retained = true;
  
				// Add a sequence number to sent messages.
				if ( prefix.indexOf("Sent:") === 0 ) {
					if ( wireMessage.sequence === undefined )
						wireMessage.sequence = ++this._sequence;
					storedMessage.sequence = wireMessage.sequence;
				}
				break;
  
			  default:
				  throw Error(format(ERROR.INVALID_STORED_DATA, [key, storedMessage]));
		  }
		  localStorage.setItem(prefix+this._localKey+wireMessage.messageIdentifier, JSON.stringify(storedMessage));
	  };
  
	  ClientImpl.prototype.restore = function(key) {
		  var value = localStorage.getItem(key);
		  var storedMessage = JSON.parse(value);
  
		  var wireMessage = new WireMessage(storedMessage.type, storedMessage);
  
		  switch(storedMessage.type) {
			case MESSAGE_TYPE.PUBLISH:
				// Replace the payload message with a Message object.
				var hex = storedMessage.payloadMessage.payloadHex;
				var buffer = new ArrayBuffer((hex.length)/2);
				var byteStream = new Uint8Array(buffer);
				var i = 0;
				while (hex.length >= 2) {
					var x = parseInt(hex.substring(0, 2), 16);
					hex = hex.substring(2, hex.length);
					byteStream[i++] = x;
				}
				var payloadMessage = new Message(byteStream);
  
				payloadMessage.qos = storedMessage.payloadMessage.qos;
				payloadMessage.destinationName = storedMessage.payloadMessage.destinationName;
				if (storedMessage.payloadMessage.duplicate)
					payloadMessage.duplicate = true;
				if (storedMessage.payloadMessage.retained)
					payloadMessage.retained = true;
				wireMessage.payloadMessage = payloadMessage;
  
				break;
  
			  default:
				throw Error(format(ERROR.INVALID_STORED_DATA, [key, value]));
		  }
  
		  if (key.indexOf("Sent:"+this._localKey) === 0) {
			  wireMessage.payloadMessage.duplicate = true;
			  this._sentMessages[wireMessage.messageIdentifier] = wireMessage;
		  } else if (key.indexOf("Received:"+this._localKey) === 0) {
			  this._receivedMessages[wireMessage.messageIdentifier] = wireMessage;
		  }
	  };
  
	  ClientImpl.prototype._process_queue = function () {
		  var message = null;
		  // Process messages in order they were added
		  var fifo = this._msg_queue.reverse();
  
		  // Send all queued messages down socket connection
		  while ((message = fifo.pop())) {
			  this._socket_send(message);
			  // Notify listeners that message was successfully sent
			  if (this._notify_msg_sent[message]) {
				  this._notify_msg_sent[message]();
				  delete this._notify_msg_sent[message];
			  }
		  }
	  };
  
	  /**
	   * Expect an ACK response for this message. Add message to the set of in progress
	   * messages and set an unused identifier in this message.
	   * [@ignore](/user/ignore)
	   */
	  ClientImpl.prototype._requires_ack = function (wireMessage) {
		  var messageCount = Object.keys(this._sentMessages).length;
		  if (messageCount > this.maxMessageIdentifier)
			  throw Error ("Too many messages:"+messageCount);
  
		  while(this._sentMessages[this._message_identifier] !== undefined) {
			  this._message_identifier++;
		  }
		  wireMessage.messageIdentifier = this._message_identifier;
		  this._sentMessages[wireMessage.messageIdentifier] = wireMessage;
		  if (wireMessage.type === MESSAGE_TYPE.PUBLISH) {
			  this.store("Sent:", wireMessage);
		  }
		  if (this._message_identifier === this.maxMessageIdentifier) {
			  this._message_identifier = 1;
		  }
	  };
  
	  /**
	   * Called when the underlying websocket has been opened.
	   * [@ignore](/user/ignore)
	   */
	  ClientImpl.prototype._on_socket_open = function () {
		  // Create the CONNECT message object.
		  var wireMessage = new WireMessage(MESSAGE_TYPE.CONNECT, this.connectOptions);
		  wireMessage.clientId = this.clientId;
		  this._socket_send(wireMessage);
	  };
  
	  /**
	   * Called when the underlying websocket has received a complete packet.
	   * [@ignore](/user/ignore)
	   */
	  ClientImpl.prototype._on_socket_message = function (event) {
		  this._trace("Client._on_socket_message", event.data);
		  var messages = this._deframeMessages(event.data);
		  for (var i = 0; i < messages.length; i+=1) {
			  this._handleMessage(messages[i]);
		  }
	  };
  
	  ClientImpl.prototype._deframeMessages = function(data) {
		  var byteArray = new Uint8Array(data);
		  var messages = [];
		  if (this.receiveBuffer) {
			  var newData = new Uint8Array(this.receiveBuffer.length+byteArray.length);
			  newData.set(this.receiveBuffer);
			  newData.set(byteArray,this.receiveBuffer.length);
			  byteArray = newData;
			  delete this.receiveBuffer;
		  }
		  try {
			  var offset = 0;
			  while(offset < byteArray.length) {
				  var result = decodeMessage(byteArray,offset);
				  var wireMessage = result[0];
				  offset = result[1];
				  if (wireMessage !== null) {
					  messages.push(wireMessage);
				  } else {
					  break;
				  }
			  }
			  if (offset < byteArray.length) {
				  this.receiveBuffer = byteArray.subarray(offset);
			  }
		  } catch (error) {
			  var errorStack = ((error.hasOwnProperty('stack') == 'undefined') ? error.stack.toString() : "No Error Stack Available");
			  this._disconnected(ERROR.INTERNAL_ERROR.code , format(ERROR.INTERNAL_ERROR, [error.message,errorStack]));
			  return;
		  }
		  return messages;
	  };
  
	  ClientImpl.prototype._handleMessage = function(wireMessage) {
  
		  this._trace("Client._handleMessage", wireMessage);
  
		  try {
			  switch(wireMessage.type) {
			  case MESSAGE_TYPE.CONNACK:
				  this._connectTimeout.cancel();
				  if (this._reconnectTimeout)
					  this._reconnectTimeout.cancel();
  
				  // If we have started using clean session then clear up the local state.
				  if (this.connectOptions.cleanSession) {
					  for (var key in this._sentMessages) {
						  var sentMessage = this._sentMessages[key];
						  localStorage.removeItem("Sent:"+this._localKey+sentMessage.messageIdentifier);
					  }
					  this._sentMessages = {};
  
					  for (var key in this._receivedMessages) {
						  var receivedMessage = this._receivedMessages[key];
						  localStorage.removeItem("Received:"+this._localKey+receivedMessage.messageIdentifier);
					  }
					  this._receivedMessages = {};
				  }
				  // Client connected and ready for business.
				  if (wireMessage.returnCode === 0) {
  
					  this.connected = true;
					  // Jump to the end of the list of uris and stop looking for a good host.
  
					  if (this.connectOptions.uris)
			  this.hostIndex = this.connectOptions.uris.length;
  
				  } else {
					  this._disconnected(ERROR.CONNACK_RETURNCODE.code , format(ERROR.CONNACK_RETURNCODE, [wireMessage.returnCode, CONNACK_RC[wireMessage.returnCode]]));
					  break;
				  }
  
				  // Resend messages.
				  var sequencedMessages = [];
				  for (var msgId in this._sentMessages) {
					  if (this._sentMessages.hasOwnProperty(msgId))
						  sequencedMessages.push(this._sentMessages[msgId]);
				  }
  
				  // Also schedule qos 0 buffered messages if any
				  if (this._buffered_msg_queue.length > 0) {
					  var msg = null;
					  var fifo = this._buffered_msg_queue.reverse();
					  while ((msg = fifo.pop())) {
						  sequencedMessages.push(msg);
						  if (this.onMessageDelivered)
							  this._notify_msg_sent[msg] = this.onMessageDelivered(msg.payloadMessage);
					  }
				  }
  
				  // Sort sentMessages into the original sent order.
				  var sequencedMessages = sequencedMessages.sort(function(a,b) {return a.sequence - b.sequence;} );
				  for (var i=0, len=sequencedMessages.length; i<len; i++) {
					  var sentMessage = sequencedMessages[i];
					  if (sentMessage.type == MESSAGE_TYPE.PUBLISH && sentMessage.pubRecReceived) {
						  var pubRelMessage = new WireMessage(MESSAGE_TYPE.PUBREL, {messageIdentifier:sentMessage.messageIdentifier});
						  this._schedule_message(pubRelMessage);
					  } else {
						  this._schedule_message(sentMessage);
				  }
				  }
  
				  // Execute the connectOptions.onSuccess callback if there is one.
		  // Will also now return if this connection was the result of an automatic
		  // reconnect and which URI was successfully connected to.
				  if (this.connectOptions.onSuccess) {
					  this.connectOptions.onSuccess({invocationContext:this.connectOptions.invocationContext});
				  }
  
				  var reconnected = false;
				  if (this._reconnecting) {
					  reconnected = true;
					  this._reconnectInterval = 1;
					  this._reconnecting = false;
				  }
  
				  // Execute the onConnected callback if there is one.
				  this._connected(reconnected, this._wsuri);
  
				  // Process all queued messages now that the connection is established.
				  this._process_queue();
				  break;
  
			  case MESSAGE_TYPE.PUBLISH:
				  this._receivePublish(wireMessage);
				  break;
  
			  case MESSAGE_TYPE.PUBACK:
				  var sentMessage = this._sentMessages[wireMessage.messageIdentifier];
				   // If this is a re flow of a PUBACK after we have restarted receivedMessage will not exist.
				  if (sentMessage) {
					  delete this._sentMessages[wireMessage.messageIdentifier];
					  localStorage.removeItem("Sent:"+this._localKey+wireMessage.messageIdentifier);
					  if (this.onMessageDelivered)
						  this.onMessageDelivered(sentMessage.payloadMessage);
				  }
				  break;
  
			  case MESSAGE_TYPE.PUBREC:
				  var sentMessage = this._sentMessages[wireMessage.messageIdentifier];
				  // If this is a re flow of a PUBREC after we have restarted receivedMessage will not exist.
				  if (sentMessage) {
					  sentMessage.pubRecReceived = true;
					  var pubRelMessage = new WireMessage(MESSAGE_TYPE.PUBREL, {messageIdentifier:wireMessage.messageIdentifier});
					  this.store("Sent:", sentMessage);
					  this._schedule_message(pubRelMessage);
				  }
				  break;
  
			  case MESSAGE_TYPE.PUBREL:
				  var receivedMessage = this._receivedMessages[wireMessage.messageIdentifier];
				  localStorage.removeItem("Received:"+this._localKey+wireMessage.messageIdentifier);
				  // If this is a re flow of a PUBREL after we have restarted receivedMessage will not exist.
				  if (receivedMessage) {
					  this._receiveMessage(receivedMessage);
					  delete this._receivedMessages[wireMessage.messageIdentifier];
				  }
				  // Always flow PubComp, we may have previously flowed PubComp but the server lost it and restarted.
				  var pubCompMessage = new WireMessage(MESSAGE_TYPE.PUBCOMP, {messageIdentifier:wireMessage.messageIdentifier});
				  this._schedule_message(pubCompMessage);
  
  
				  break;
  
			  case MESSAGE_TYPE.PUBCOMP:
				  var sentMessage = this._sentMessages[wireMessage.messageIdentifier];
				  delete this._sentMessages[wireMessage.messageIdentifier];
				  localStorage.removeItem("Sent:"+this._localKey+wireMessage.messageIdentifier);
				  if (this.onMessageDelivered)
					  this.onMessageDelivered(sentMessage.payloadMessage);
				  break;
  
			  case MESSAGE_TYPE.SUBACK:
				  var sentMessage = this._sentMessages[wireMessage.messageIdentifier];
				  if (sentMessage) {
					  if(sentMessage.timeOut)
						  sentMessage.timeOut.cancel();
					  // This will need to be fixed when we add multiple topic support
					  if (wireMessage.returnCode[0] === 0x80) {
						  if (sentMessage.onFailure) {
							  sentMessage.onFailure(wireMessage.returnCode);
						  }
					  } else if (sentMessage.onSuccess) {
						  sentMessage.onSuccess(wireMessage.returnCode);
					  }
					  delete this._sentMessages[wireMessage.messageIdentifier];
				  }
				  break;
  
			  case MESSAGE_TYPE.UNSUBACK:
				  var sentMessage = this._sentMessages[wireMessage.messageIdentifier];
				  if (sentMessage) {
					  if (sentMessage.timeOut)
						  sentMessage.timeOut.cancel();
					  if (sentMessage.callback) {
						  sentMessage.callback();
					  }
					  delete this._sentMessages[wireMessage.messageIdentifier];
				  }
  
				  break;
  
			  case MESSAGE_TYPE.PINGRESP:
				  /* The sendPinger or receivePinger may have sent a ping, the receivePinger has already been reset. */
				  this.sendPinger.reset();
				  break;
  
			  case MESSAGE_TYPE.DISCONNECT:
				  // Clients do not expect to receive disconnect packets.
				  this._disconnected(ERROR.INVALID_MQTT_MESSAGE_TYPE.code , format(ERROR.INVALID_MQTT_MESSAGE_TYPE, [wireMessage.type]));
				  break;
  
			  default:
				  this._disconnected(ERROR.INVALID_MQTT_MESSAGE_TYPE.code , format(ERROR.INVALID_MQTT_MESSAGE_TYPE, [wireMessage.type]));
			  }
		  } catch (error) {
			  var errorStack = ((error.hasOwnProperty('stack') == 'undefined') ? error.stack.toString() : "No Error Stack Available");
			  this._disconnected(ERROR.INTERNAL_ERROR.code , format(ERROR.INTERNAL_ERROR, [error.message,errorStack]));
			  return;
		  }
	  };
  
	  /** [@ignore](/user/ignore) */
	  ClientImpl.prototype._on_socket_error = function (error) {
		  if (!this._reconnecting) {
		  this._disconnected(ERROR.SOCKET_ERROR.code , format(ERROR.SOCKET_ERROR, [error.data]));
		  }
	  };
  
	  /** [@ignore](/user/ignore) */
	  ClientImpl.prototype._on_socket_close = function () {
		  if (!this._reconnecting) {
		  this._disconnected(ERROR.SOCKET_CLOSE.code , format(ERROR.SOCKET_CLOSE));
		  }
	  };
  
	  /** [@ignore](/user/ignore) */
	  ClientImpl.prototype._socket_send = function (wireMessage) {
  
		  if (wireMessage.type == 1) {
			  var wireMessageMasked = this._traceMask(wireMessage, "password");
			  this._trace("Client._socket_send", wireMessageMasked);
		  }
		  else this._trace("Client._socket_send", wireMessage);
  
		  this.socket.send(wireMessage.encode());
		  /* We have proved to the server we are alive. */
		  this.sendPinger.reset();
	  };
  
	  /** [@ignore](/user/ignore) */
	  ClientImpl.prototype._receivePublish = function (wireMessage) {
		  switch(wireMessage.payloadMessage.qos) {
			  case "undefined":
			  case 0:
				  this._receiveMessage(wireMessage);
				  break;
  
			  case 1:
				  var pubAckMessage = new WireMessage(MESSAGE_TYPE.PUBACK, {messageIdentifier:wireMessage.messageIdentifier});
				  this._schedule_message(pubAckMessage);
				  this._receiveMessage(wireMessage);
				  break;
  
			  case 2:
				  this._receivedMessages[wireMessage.messageIdentifier] = wireMessage;
				  this.store("Received:", wireMessage);
				  var pubRecMessage = new WireMessage(MESSAGE_TYPE.PUBREC, {messageIdentifier:wireMessage.messageIdentifier});
				  this._schedule_message(pubRecMessage);
  
				  break;
  
			  default:
				  throw Error("Invaild qos="+wireMmessage.payloadMessage.qos);
		  }
	  };
  
	  /** [@ignore](/user/ignore) */
	  ClientImpl.prototype._receiveMessage = function (wireMessage) {
		  if (this.onMessageArrived) {
			  this.onMessageArrived(wireMessage.payloadMessage);
		  }
	  };
  
	  /**
	   * Client has connected.
	   * [@param](/user/param) {reconnect} [boolean] indicate if this was a result of reconnect operation.
	   * [@param](/user/param) {uri} [string] fully qualified WebSocket URI of the server.
	   */
	  ClientImpl.prototype._connected = function (reconnect, uri) {
		  // Execute the onConnected callback if there is one.
		  if (this.onConnected)
			  this.onConnected(reconnect, uri);
	  };
  
	  /**
	   * Attempts to reconnect the client to the server.
	 * For each reconnect attempt, will double the reconnect interval
	 * up to 128 seconds.
	   */
	  ClientImpl.prototype._reconnect = function () {
		  this._trace("Client._reconnect");
		  if (!this.connected) {
			  this._reconnecting = true;
			  this.sendPinger.cancel();
			  this.receivePinger.cancel();
			  if (this._reconnectInterval < 3)
				  this._reconnectInterval = this._reconnectInterval * 2;
			  if (this.connectOptions.uris) {
				  this.hostIndex = 0;
				  this._doConnect(this.connectOptions.uris[0]);
			  } else {
				  this._doConnect(this.uri);
			  }
		  }
	  };
  
	  /**
	   * Client has disconnected either at its own request or because the server
	   * or network disconnected it. Remove all non-durable state.
	   * [@param](/user/param) {errorCode} [number] the error number.
	   * [@param](/user/param) {errorText} [string] the error text.
	   * [@ignore](/user/ignore)
	   */
	  ClientImpl.prototype._disconnected = function (errorCode, errorText) {
		  this._trace("Client._disconnected", errorCode, errorText);
  
		  if (errorCode !== undefined && this._reconnecting) {
		//Continue automatic reconnect process
		  this._reconnectTimeout = new Timeout(this, window, this._reconnectInterval, this._reconnect);
			  return;
		  }
  
		  this.sendPinger.cancel();
		  this.receivePinger.cancel();
		  if (this._connectTimeout) {
			  this._connectTimeout.cancel();
			  this._connectTimeout = null;
		  }
  
		  // Clear message buffers.
		  this._msg_queue = [];
		  this._buffered_msg_queue = [];
		  this._notify_msg_sent = {};
  
		  if (this.socket) {
			  // Cancel all socket callbacks so that they cannot be driven again by this socket.
			  this.socket.onopen = null;
			  this.socket.onmessage = null;
			  this.socket.onerror = null;
			  this.socket.onclose = null;
			  if (this.socket.readyState === 1)
				  this.socket.close();
			  delete this.socket;
		  }
  
		  if (this.connectOptions.uris && this.hostIndex < this.connectOptions.uris.length-1) {
			  // Try the next host.
			  this.hostIndex++;
			  this._doConnect(this.connectOptions.uris[this.hostIndex]);
		  } else {
  
			  if (errorCode === undefined) {
				  errorCode = ERROR.OK.code;
				  errorText = format(ERROR.OK);
			  }
  
			  // Run any application callbacks last as they may attempt to reconnect and hence create a new socket.
			  if (this.connected) {
				  this.connected = false;
				  // Execute the connectionLostCallback if there is one, and we were connected.
				  if (this.onConnectionLost) {
					  this.onConnectionLost({errorCode:errorCode, errorMessage:errorText, reconnect:this.connectOptions.reconnect, uri:this._wsuri});
				  }
				  if (errorCode !== ERROR.OK.code && this.connectOptions.reconnect) {
					  // Start automatic reconnect process for the very first time since last successful connect.
					  this._reconnectInterval = 1;
					  this._reconnect();
					  return;
				  }
			  } else {
				  // Otherwise we never had a connection, so indicate that the connect has failed.
				  if (this.connectOptions.mqttVersion === 4 && this.connectOptions.mqttVersionExplicit === false) {
					  this._trace("Failed to connect V4, dropping back to V3");
					  this.connectOptions.mqttVersion = 3;
					  if (this.connectOptions.uris) {
						  this.hostIndex = 0;
						  this._doConnect(this.connectOptions.uris[0]);
					  } else {
						  this._doConnect(this.uri);
					  }
				  } else if(this.connectOptions.onFailure) {
					  this.connectOptions.onFailure({invocationContext:this.connectOptions.invocationContext, errorCode:errorCode, errorMessage:errorText});
				  }
			  }
		  }
	  };
  
	  /** [@ignore](/user/ignore) */
	  ClientImpl.prototype._trace = function () {
		  // Pass trace message back to client's callback function
		  if (this.traceFunction) {
			  for (var i in arguments)
			  {
				  if (typeof arguments[i] !== "undefined")
					  arguments.splice(i, 1, JSON.stringify(arguments[i]));
			  }
			  var record = Array.prototype.slice.call(arguments).join("");
			  this.traceFunction ({severity: "Debug", message: record	});
		  }
  
		  //buffer style trace
		  if ( this._traceBuffer !== null ) {
			  for (var i = 0, max = arguments.length; i < max; i++) {
				  if ( this._traceBuffer.length == this._MAX_TRACE_ENTRIES ) {
					  this._traceBuffer.shift();
				  }
				  if (i === 0) this._traceBuffer.push(arguments[i]);
				  else if (typeof arguments[i] === "undefined" ) this._traceBuffer.push(arguments[i]);
				  else this._traceBuffer.push("  "+JSON.stringify(arguments[i]));
			 }
		  }
	  };
  
	  /** [@ignore](/user/ignore) */
	  ClientImpl.prototype._traceMask = function (traceObject, masked) {
		  var traceObjectMasked = {};
		  for (var attr in traceObject) {
			  if (traceObject.hasOwnProperty(attr)) {
				  if (attr == masked)
					  traceObjectMasked[attr] = "******";
				  else
					  traceObjectMasked[attr] = traceObject[attr];
			  }
		  }
		  return traceObjectMasked;
	  };
  
	  // ------------------------------------------------------------------------
	  // Public Programming interface.
	  // ------------------------------------------------------------------------
  
	  /**
	   * The JavaScript application communicates to the server using a {[@link](/user/link) Paho.MQTT.Client} object.
	   * <p>
	   * Most applications will create just one Client object and then call its connect() method,
	   * however applications can create more than one Client object if they wish.
	   * In this case the combination of host, port and clientId attributes must be different for each Client object.
	   * <p>
	   * The send, subscribe and unsubscribe methods are implemented as asynchronous JavaScript methods
	   * (even though the underlying protocol exchange might be synchronous in nature).
	   * This means they signal their completion by calling back to the application,
	   * via Success or Failure callback functions provided by the application on the method in question.
	   * Such callbacks are called at most once per method invocation and do not persist beyond the lifetime
	   * of the script that made the invocation.
	   * <p>
	   * In contrast there are some callback functions, most notably <i>onMessageArrived</i>,
	   * that are defined on the {[@link](/user/link) Paho.MQTT.Client} object.
	   * These may get called multiple times, and aren't directly related to specific method invocations made by the client.
	   *
	   * [@name](/user/name) Paho.MQTT.Client
	   *
	   * [@constructor](/user/constructor)
	   *
	   * [@param](/user/param) {string} host - the address of the messaging server, as a fully qualified WebSocket URI, as a DNS name or dotted decimal IP address.
	   * [@param](/user/param) {number} port - the port number to connect to - only required if host is not a URI
	   * [@param](/user/param) {string} path - the path on the host to connect to - only used if host is not a URI. Default: '/mqtt'.
	   * [@param](/user/param) {string} clientId - the Messaging client identifier, between 1 and 23 characters in length.
	   *
	   * [@property](/user/property) {string} host - <i>read only</i> the server's DNS hostname or dotted decimal IP address.
	   * [@property](/user/property) {number} port - <i>read only</i> the server's port.
	   * [@property](/user/property) {string} path - <i>read only</i> the server's path.
	   * [@property](/user/property) {string} clientId - <i>read only</i> used when connecting to the server.
	   * [@property](/user/property) {function} onConnectionLost - called when a connection has been lost.
	   *                            after a connect() method has succeeded.
	   *                            Establish the call back used when a connection has been lost. The connection may be
	   *                            lost because the client initiates a disconnect or because the server or network
	   *                            cause the client to be disconnected. The disconnect call back may be called without
	   *                            the connectionComplete call back being invoked if, for example the client fails to
	   *                            connect.
	   *                            A single response object parameter is passed to the onConnectionLost callback containing the following fields:
	   *                            <ol>
	   *                            <li>errorCode
	   *                            <li>errorMessage
	   *                            </ol>
	   * [@property](/user/property) {function} onMessageDelivered - called when a message has been delivered.
	   *                            All processing that this Client will ever do has been completed. So, for example,
	   *                            in the case of a Qos=2 message sent by this client, the PubComp flow has been received from the server
	   *                            and the message has been removed from persistent storage before this callback is invoked.
	   *                            Parameters passed to the onMessageDelivered callback are:
	   *                            <ol>
	   *                            <li>{[@link](/user/link) Paho.MQTT.Message} that was delivered.
	   *                            </ol>
	   * [@property](/user/property) {function} onMessageArrived - called when a message has arrived in this Paho.MQTT.client.
	   *                            Parameters passed to the onMessageArrived callback are:
	   *                            <ol>
	   *                            <li>{[@link](/user/link) Paho.MQTT.Message} that has arrived.
	   *                            </ol>
	   * [@property](/user/property) {function} onConnected - called when a connection is successfully made to the server.
	   *                                  after a connect() method.
	   *                                  Parameters passed to the onConnected callback are:
	   *                                  <ol>
	   *                                  <li>reconnect (boolean) - If true, the connection was the result of a reconnect.</li>
	   *                                  <li>URI (string) - The URI used to connect to the server.</li>
	   *                                  </ol>
	   * [@property](/user/property) {boolean} disconnectedPublishing - if set, will enable disconnected publishing in
	   *                                            in the event that the connection to the server is lost.
	   * [@property](/user/property) {number} disconnectedBufferSize - Used to set the maximum number of messages that the disconnected
	   *                                             buffer will hold before rejecting new messages. Default size: 5000 messages
	   * [@property](/user/property) {function} trace - called whenever trace is called. TODO
	   */
	  var Client = function (host, port, path, clientId) {
  
		  var uri;
  
		  if (typeof host !== "string")
			  throw new Error(format(ERROR.INVALID_TYPE, [typeof host, "host"]));
  
		  if (arguments.length == 2) {
			  // host: must be full ws:// uri
			  // port: clientId
			  clientId = port;
			  uri = host;
			  var match = uri.match(/^(wss?):\/\/((\[(.+)\])|([^\/]+?))(:(\d+))?(\/.*)$/);
			  if (match) {
				  host = match[4]||match[2];
				  port = parseInt(match[7]);
				  path = match[8];
			  } else {
				  throw new Error(format(ERROR.INVALID_ARGUMENT,[host,"host"]));
			  }
		  } else {
			  if (arguments.length == 3) {
				  clientId = path;
				  path = "/mqtt";
			  }
			  if (typeof port !== "number" || port < 0)
				  throw new Error(format(ERROR.INVALID_TYPE, [typeof port, "port"]));
			  if (typeof path !== "string")
				  throw new Error(format(ERROR.INVALID_TYPE, [typeof path, "path"]));
  
			  var ipv6AddSBracket = (host.indexOf(":") !== -1 && host.slice(0,1) !== "[" && host.slice(-1) !== "]");
			  uri = "ws://"+(ipv6AddSBracket?"["+host+"]":host)+":"+port+path;
		  }
  
		  var clientIdLength = 0;
		  for (var i = 0; i<clientId.length; i++) {
			  var charCode = clientId.charCodeAt(i);
			  if (0xD800 <= charCode && charCode <= 0xDBFF)  {
				   i++; // Surrogate pair.
			  }
			  clientIdLength++;
		  }
		  if (typeof clientId !== "string" || clientIdLength > 65535)
			  throw new Error(format(ERROR.INVALID_ARGUMENT, [clientId, "clientId"]));
  
		  var client = new ClientImpl(uri, host, port, path, clientId);
		  this._getHost =  function() { return host; };
		  this._setHost = function() { throw new Error(format(ERROR.UNSUPPORTED_OPERATION)); };
  
		  this._getPort = function() { return port; };
		  this._setPort = function() { throw new Error(format(ERROR.UNSUPPORTED_OPERATION)); };
  
		  this._getPath = function() { return path; };
		  this._setPath = function() { throw new Error(format(ERROR.UNSUPPORTED_OPERATION)); };
  
		  this._getURI = function() { return uri; };
		  this._setURI = function() { throw new Error(format(ERROR.UNSUPPORTED_OPERATION)); };
  
		  this._getClientId = function() { return client.clientId; };
		  this._setClientId = function() { throw new Error(format(ERROR.UNSUPPORTED_OPERATION)); };
  
		  this._getOnConnected = function() { return client.onConnected; };
		  this._setOnConnected = function(newOnConnected) {
			  if (typeof newOnConnected === "function")
				  client.onConnected = newOnConnected;
			  else
				  throw new Error(format(ERROR.INVALID_TYPE, [typeof newOnConnected, "onConnected"]));
		  };
  
		  this._getDisconnectedPublishing = function() { return client.disconnectedPublishing; };
		  this._setDisconnectedPublishing = function(newDisconnectedPublishing) {
			  client.disconnectedPublishing = newDisconnectedPublishing;
		  };
  
		  this._getDisconnectedBufferSize = function() { return client.disconnectedBufferSize; };
		  this._setDisconnectedBufferSize = function(newDisconnectedBufferSize) {
			  client.disconnectedBufferSize = newDisconnectedBufferSize;
		  };
  
		  this._getOnConnectionLost = function() { return client.onConnectionLost; };
		  this._setOnConnectionLost = function(newOnConnectionLost) {
			  if (typeof newOnConnectionLost === "function")
				  client.onConnectionLost = newOnConnectionLost;
			  else
				  throw new Error(format(ERROR.INVALID_TYPE, [typeof newOnConnectionLost, "onConnectionLost"]));
		  };
  
		  this._getOnMessageDelivered = function() { return client.onMessageDelivered; };
		  this._setOnMessageDelivered = function(newOnMessageDelivered) {
			  if (typeof newOnMessageDelivered === "function")
				  client.onMessageDelivered = newOnMessageDelivered;
			  else
				  throw new Error(format(ERROR.INVALID_TYPE, [typeof newOnMessageDelivered, "onMessageDelivered"]));
		  };
  
		  this._getOnMessageArrived = function() { return client.onMessageArrived; };
		  this._setOnMessageArrived = function(newOnMessageArrived) {
			  if (typeof newOnMessageArrived === "function")
				  client.onMessageArrived = newOnMessageArrived;
			  else
				  throw new Error(format(ERROR.INVALID_TYPE, [typeof newOnMessageArrived, "onMessageArrived"]));
		  };
  
		  this._getTrace = function() { return client.traceFunction; };
		  this._setTrace = function(trace) {
			  if(typeof trace === "function"){
				  client.traceFunction = trace;
			  }else{
				  throw new Error(format(ERROR.INVALID_TYPE, [typeof trace, "onTrace"]));
			  }
		  };
  
		  /**
		   * Connect this Messaging client to its server.
		   *
		   * [@name](/user/name) Paho.MQTT.Client#connect
		   * [@function](/user/function)
		   * [@param](/user/param) {object} connectOptions - Attributes used with the connection.
		   * [@param](/user/param) {number} connectOptions.timeout - If the connect has not succeeded within this
		   *                    number of seconds, it is deemed to have failed.
		   *                    The default is 30 seconds.
		   * [@param](/user/param) {string} connectOptions.userName - Authentication username for this connection.
		   * [@param](/user/param) {string} connectOptions.password - Authentication password for this connection.
		   * [@param](/user/param) {Paho.MQTT.Message} connectOptions.willMessage - sent by the server when the client
		   *                    disconnects abnormally.
		   * [@param](/user/param) {number} connectOptions.keepAliveInterval - the server disconnects this client if
		   *                    there is no activity for this number of seconds.
		   *                    The default value of 60 seconds is assumed if not set.
		   * [@param](/user/param) {boolean} connectOptions.cleanSession - if true(default) the client and server
		   *                    persistent state is deleted on successful connect.
		   * [@param](/user/param) {boolean} connectOptions.useSSL - if present and true, use an SSL Websocket connection.
		   * [@param](/user/param) {object} connectOptions.invocationContext - passed to the onSuccess callback or onFailure callback.
		   * [@param](/user/param) {function} connectOptions.onSuccess - called when the connect acknowledgement
		   *                    has been received from the server.
		   * A single response object parameter is passed to the onSuccess callback containing the following fields:
		   * <ol>
		   * <li>invocationContext as passed in to the onSuccess method in the connectOptions.
		   * </ol>
	   * [@param](/user/param) {function} connectOptions.onFailure - called when the connect request has failed or timed out.
		   * A single response object parameter is passed to the onFailure callback containing the following fields:
		   * <ol>
		   * <li>invocationContext as passed in to the onFailure method in the connectOptions.
		   * <li>errorCode a number indicating the nature of the error.
		   * <li>errorMessage text describing the error.
		   * </ol>
	   * [@param](/user/param) {array} connectOptions.hosts - If present this contains either a set of hostnames or fully qualified
		   * WebSocket URIs (ws://iot.eclipse.org:80/ws), that are tried in order in place
		   * of the host and port paramater on the construtor. The hosts are tried one at at time in order until
		   * one of then succeeds.
	   * [@param](/user/param) {array} connectOptions.ports - If present the set of ports matching the hosts. If hosts contains URIs, this property
		   * is not used.
	   * [@param](/user/param) {boolean} connectOptions.reconnect - Sets whether the client will automatically attempt to reconnect
	   * to the server if the connection is lost.
	   *<ul>
	   *<li>If set to false, the client will not attempt to automatically reconnect to the server in the event that the
	   * connection is lost.</li>
	   *<li>If set to true, in the event that the connection is lost, the client will attempt to reconnect to the server.
	   * It will initially wait 1 second before it attempts to reconnect, for every failed reconnect attempt, the delay
	   * will double until it is at 2 minutes at which point the delay will stay at 2 minutes.</li>
	   *</ul>
	   * [@param](/user/param) {number} connectOptions.mqttVersion - The version of MQTT to use to connect to the MQTT Broker.
	   *<ul>
	   *<li>3 - MQTT V3.1</li>
	   *<li>4 - MQTT V3.1.1</li>
	   *</ul>
	   * [@param](/user/param) {boolean} connectOptions.mqttVersionExplicit - If set to true, will force the connection to use the
	   * selected MQTT Version or will fail to connect.
	   * [@param](/user/param) {array} connectOptions.uris - If present, should contain a list of fully qualified WebSocket uris
	   * (e.g. ws://iot.eclipse.org:80/ws), that are tried in order in place of the host and port parameter of the construtor.
	   * The uris are tried one at a time in order until one of them succeeds. Do not use this in conjunction with hosts as
	   * the hosts array will be converted to uris and will overwrite this property.
		   * [@throws](/user/throws) {InvalidState} If the client is not in disconnected state. The client must have received connectionLost
		   * or disconnected before calling connect for a second or subsequent time.
		   */
		  this.connect = function (connectOptions) {
			  connectOptions = connectOptions || {} ;
			  validate(connectOptions,  {timeout:"number",
										 userName:"string",
										 password:"string",
										 willMessage:"object",
										 keepAliveInterval:"number",
										 cleanSession:"boolean",
										 useSSL:"boolean",
										 invocationContext:"object",
										 onSuccess:"function",
										 onFailure:"function",
										 hosts:"object",
										 ports:"object",
										 reconnect:"boolean",
										 mqttVersion:"number",
										 mqttVersionExplicit:"boolean",
										 uris: "object"});
  
			  // If no keep alive interval is set, assume 60 seconds.
			  if (connectOptions.keepAliveInterval === undefined)
				  connectOptions.keepAliveInterval = 60;
  
			  if (connectOptions.mqttVersion > 4 || connectOptions.mqttVersion < 3) {
				  throw new Error(format(ERROR.INVALID_ARGUMENT, [connectOptions.mqttVersion, "connectOptions.mqttVersion"]));
			  }
  
			  if (connectOptions.mqttVersion === undefined) {
				  connectOptions.mqttVersionExplicit = false;
				  connectOptions.mqttVersion = 4;
			  } else {
				  connectOptions.mqttVersionExplicit = true;
			  }
  
			  //Check that if password is set, so is username
			  if (connectOptions.password !== undefined && connectOptions.userName === undefined)
				  throw new Error(format(ERROR.INVALID_ARGUMENT, [connectOptions.password, "connectOptions.password"]));
  
			  if (connectOptions.willMessage) {
				  if (!(connectOptions.willMessage instanceof Message))
					  throw new Error(format(ERROR.INVALID_TYPE, [connectOptions.willMessage, "connectOptions.willMessage"]));
				  // The will message must have a payload that can be represented as a string.
				  // Cause the willMessage to throw an exception if this is not the case.
				  connectOptions.willMessage.stringPayload = null;
  
				  if (typeof connectOptions.willMessage.destinationName === "undefined")
					  throw new Error(format(ERROR.INVALID_TYPE, [typeof connectOptions.willMessage.destinationName, "connectOptions.willMessage.destinationName"]));
			  }
			  if (typeof connectOptions.cleanSession === "undefined")
				  connectOptions.cleanSession = true;
			  if (connectOptions.hosts) {
  
				  if (!(connectOptions.hosts instanceof Array) )
					  throw new Error(format(ERROR.INVALID_ARGUMENT, [connectOptions.hosts, "connectOptions.hosts"]));
				  if (connectOptions.hosts.length <1 )
					  throw new Error(format(ERROR.INVALID_ARGUMENT, [connectOptions.hosts, "connectOptions.hosts"]));
  
				  var usingURIs = false;
				  for (var i = 0; i<connectOptions.hosts.length; i++) {
					  if (typeof connectOptions.hosts[i] !== "string")
						  throw new Error(format(ERROR.INVALID_TYPE, [typeof connectOptions.hosts[i], "connectOptions.hosts["+i+"]"]));
					  if (/^(wss?):\/\/((\[(.+)\])|([^\/]+?))(:(\d+))?(\/.*)$/.test(connectOptions.hosts[i])) {
						  if (i === 0) {
							  usingURIs = true;
						  } else if (!usingURIs) {
							  throw new Error(format(ERROR.INVALID_ARGUMENT, [connectOptions.hosts[i], "connectOptions.hosts["+i+"]"]));
						  }
					  } else if (usingURIs) {
						  throw new Error(format(ERROR.INVALID_ARGUMENT, [connectOptions.hosts[i], "connectOptions.hosts["+i+"]"]));
					  }
				  }
  
				  if (!usingURIs) {
					  if (!connectOptions.ports)
						  throw new Error(format(ERROR.INVALID_ARGUMENT, [connectOptions.ports, "connectOptions.ports"]));
					  if (!(connectOptions.ports instanceof Array) )
						  throw new Error(format(ERROR.INVALID_ARGUMENT, [connectOptions.ports, "connectOptions.ports"]));
					  if (connectOptions.hosts.length !== connectOptions.ports.length)
						  throw new Error(format(ERROR.INVALID_ARGUMENT, [connectOptions.ports, "connectOptions.ports"]));
  
					  connectOptions.uris = [];
  
					  for (var i = 0; i<connectOptions.hosts.length; i++) {
						  if (typeof connectOptions.ports[i] !== "number" || connectOptions.ports[i] < 0)
							  throw new Error(format(ERROR.INVALID_TYPE, [typeof connectOptions.ports[i], "connectOptions.ports["+i+"]"]));
						  var host = connectOptions.hosts[i];
						  var port = connectOptions.ports[i];
  
						  var ipv6 = (host.indexOf(":") !== -1);
						  uri = "ws://"+(ipv6?"["+host+"]":host)+":"+port+path;
						  connectOptions.uris.push(uri);
					  }
				  } else {
					  connectOptions.uris = connectOptions.hosts;
				  }
			  }
  
			  client.connect(connectOptions);
		  };
  
		  /**
		   * Subscribe for messages, request receipt of a copy of messages sent to the destinations described by the filter.
		   *
		   * [@name](/user/name) Paho.MQTT.Client#subscribe
		   * [@function](/user/function)
		   * [@param](/user/param) {string} filter describing the destinations to receive messages from.
		   * <br>
		   * [@param](/user/param) {object} subscribeOptions - used to control the subscription
		   *
		   * [@param](/user/param) {number} subscribeOptions.qos - the maiximum qos of any publications sent
		   *                                  as a result of making this subscription.
		   * [@param](/user/param) {object} subscribeOptions.invocationContext - passed to the onSuccess callback
		   *                                  or onFailure callback.
		   * [@param](/user/param) {function} subscribeOptions.onSuccess - called when the subscribe acknowledgement
		   *                                  has been received from the server.
		   *                                  A single response object parameter is passed to the onSuccess callback containing the following fields:
		   *                                  <ol>
		   *                                  <li>invocationContext if set in the subscribeOptions.
		   *                                  </ol>
		   * [@param](/user/param) {function} subscribeOptions.onFailure - called when the subscribe request has failed or timed out.
		   *                                  A single response object parameter is passed to the onFailure callback containing the following fields:
		   *                                  <ol>
		   *                                  <li>invocationContext - if set in the subscribeOptions.
		   *                                  <li>errorCode - a number indicating the nature of the error.
		   *                                  <li>errorMessage - text describing the error.
		   *                                  </ol>
		   * [@param](/user/param) {number} subscribeOptions.timeout - which, if present, determines the number of
		   *                                  seconds after which the onFailure calback is called.
		   *                                  The presence of a timeout does not prevent the onSuccess
		   *                                  callback from being called when the subscribe completes.
		   * [@throws](/user/throws) {InvalidState} if the client is not in connected state.
		   */
		  this.subscribe = function (filter, subscribeOptions) {
			  if (typeof filter !== "string")
				  throw new Error("Invalid argument:"+filter);
			  subscribeOptions = subscribeOptions || {} ;
			  validate(subscribeOptions,  {qos:"number",
										   invocationContext:"object",
										   onSuccess:"function",
										   onFailure:"function",
										   timeout:"number"
										  });
			  if (subscribeOptions.timeout && !subscribeOptions.onFailure)
				  throw new Error("subscribeOptions.timeout specified with no onFailure callback.");
			  if (typeof subscribeOptions.qos !== "undefined" && !(subscribeOptions.qos === 0 || subscribeOptions.qos === 1 || subscribeOptions.qos === 2 ))
				  throw new Error(format(ERROR.INVALID_ARGUMENT, [subscribeOptions.qos, "subscribeOptions.qos"]));
			  client.subscribe(filter, subscribeOptions);
		  };
  
		  /**
		   * Unsubscribe for messages, stop receiving messages sent to destinations described by the filter.
		   *
		   * [@name](/user/name) Paho.MQTT.Client#unsubscribe
		   * [@function](/user/function)
		   * [@param](/user/param) {string} filter - describing the destinations to receive messages from.
		   * [@param](/user/param) {object} unsubscribeOptions - used to control the subscription
		   * [@param](/user/param) {object} unsubscribeOptions.invocationContext - passed to the onSuccess callback
												or onFailure callback.
		   * [@param](/user/param) {function} unsubscribeOptions.onSuccess - called when the unsubscribe acknowledgement has been received from the server.
		   *                                    A single response object parameter is passed to the
		   *                                    onSuccess callback containing the following fields:
		   *                                    <ol>
		   *                                    <li>invocationContext - if set in the unsubscribeOptions.
		   *                                    </ol>
		   * [@param](/user/param) {function} unsubscribeOptions.onFailure called when the unsubscribe request has failed or timed out.
		   *                                    A single response object parameter is passed to the onFailure callback containing the following fields:
		   *                                    <ol>
		   *                                    <li>invocationContext - if set in the unsubscribeOptions.
		   *                                    <li>errorCode - a number indicating the nature of the error.
		   *                                    <li>errorMessage - text describing the error.
		   *                                    </ol>
		   * [@param](/user/param) {number} unsubscribeOptions.timeout - which, if present, determines the number of seconds
		   *                                    after which the onFailure callback is called. The presence of
		   *                                    a timeout does not prevent the onSuccess callback from being
		   *                                    called when the unsubscribe completes
		   * [@throws](/user/throws) {InvalidState} if the client is not in connected state.
		   */
		  this.unsubscribe = function (filter, unsubscribeOptions) {
			  if (typeof filter !== "string")
				  throw new Error("Invalid argument:"+filter);
			  unsubscribeOptions = unsubscribeOptions || {} ;
			  validate(unsubscribeOptions,  {invocationContext:"object",
											 onSuccess:"function",
											 onFailure:"function",
											 timeout:"number"
											});
			  if (unsubscribeOptions.timeout && !unsubscribeOptions.onFailure)
				  throw new Error("unsubscribeOptions.timeout specified with no onFailure callback.");
			  client.unsubscribe(filter, unsubscribeOptions);
		  };
  
		  /**
		   * Send a message to the consumers of the destination in the Message.
		   *
		   * [@name](/user/name) Paho.MQTT.Client#send
		   * [@function](/user/function)
		   * [@param](/user/param) {string|Paho.MQTT.Message} topic - <b>mandatory</b> The name of the destination to which the message is to be sent.
		   * 					   - If it is the only parameter, used as Paho.MQTT.Message object.
		   * [@param](/user/param) {String|ArrayBuffer} payload - The message data to be sent.
		   * [@param](/user/param) {number} qos The Quality of Service used to deliver the message.
		   * 		<dl>
		   * 			<dt>0 Best effort (default).
		   *     			<dt>1 At least once.
		   *     			<dt>2 Exactly once.
		   * 		</dl>
		   * [@param](/user/param) {Boolean} retained If true, the message is to be retained by the server and delivered
		   *                     to both current and future subscriptions.
		   *                     If false the server only delivers the message to current subscribers, this is the default for new Messages.
		   *                     A received message has the retained boolean set to true if the message was published
		   *                     with the retained boolean set to true
		   *                     and the subscrption was made after the message has been published.
		   * [@throws](/user/throws) {InvalidState} if the client is not connected.
		   */
		  this.send = function (topic,payload,qos,retained) {
			  var message ;
  
			  if(arguments.length === 0){
				  throw new Error("Invalid argument."+"length");
  
			  }else if(arguments.length == 1) {
  
				  if (!(topic instanceof Message) && (typeof topic !== "string"))
					  throw new Error("Invalid argument:"+ typeof topic);
  
				  message = topic;
				  if (typeof message.destinationName === "undefined")
					  throw new Error(format(ERROR.INVALID_ARGUMENT,[message.destinationName,"Message.destinationName"]));
				  client.send(message);
  
			  }else {
				  //parameter checking in Message object
				  message = new Message(payload);
				  message.destinationName = topic;
				  if(arguments.length >= 3)
					  message.qos = qos;
				  if(arguments.length >= 4)
					  message.retained = retained;
				  client.send(message);
			  }
		  };
  
		  /**
		   * Publish a message to the consumers of the destination in the Message.
		   * Synonym for Paho.Mqtt.Client#send
		   *
		   * [@name](/user/name) Paho.MQTT.Client#publish
		   * [@function](/user/function)
		   * [@param](/user/param) {string|Paho.MQTT.Message} topic - <b>mandatory</b> The name of the topic to which the message is to be published.
		   * 					   - If it is the only parameter, used as Paho.MQTT.Message object.
		   * [@param](/user/param) {String|ArrayBuffer} payload - The message data to be published.
		   * [@param](/user/param) {number} qos The Quality of Service used to deliver the message.
		   * 		<dl>
		   * 			<dt>0 Best effort (default).
		   *     			<dt>1 At least once.
		   *     			<dt>2 Exactly once.
		   * 		</dl>
		   * [@param](/user/param) {Boolean} retained If true, the message is to be retained by the server and delivered
		   *                     to both current and future subscriptions.
		   *                     If false the server only delivers the message to current subscribers, this is the default for new Messages.
		   *                     A received message has the retained boolean set to true if the message was published
		   *                     with the retained boolean set to true
		   *                     and the subscrption was made after the message has been published.
		   * [@throws](/user/throws) {InvalidState} if the client is not connected.
		   */
		   this.publish = function(topic,payload,qos,retained) {
			   //console.log("Publising message to: ", topic);
			   var message ;
  
			  if(arguments.length === 0){
				  throw new Error("Invalid argument."+"length");
  
			  }else if(arguments.length == 1) {
  
				  if (!(topic instanceof Message) && (typeof topic !== "string"))
					  throw new Error("Invalid argument:"+ typeof topic);
  
				  message = topic;
				  if (typeof message.destinationName === "undefined")
					  throw new Error(format(ERROR.INVALID_ARGUMENT,[message.destinationName,"Message.destinationName"]));
				  client.send(message);
  
			  }else {
				  //parameter checking in Message object
				  message = new Message(payload);
				  message.destinationName = topic;
				  if(arguments.length >= 3)
					  message.qos = qos;
				  if(arguments.length >= 4)
					  message.retained = retained;
				  client.send(message);
			  }
		  };
  
		  /**
		   * Normal disconnect of this Messaging client from its server.
		   *
		   * [@name](/user/name) Paho.MQTT.Client#disconnect
		   * [@function](/user/function)
		   * [@throws](/user/throws) {InvalidState} if the client is already disconnected.
		   */
		  this.disconnect = function () {
			  client.disconnect();
		  };
  
		  /**
		   * Get the contents of the trace log.
		   *
		   * [@name](/user/name) Paho.MQTT.Client#getTraceLog
		   * [@function](/user/function)
		   * [@return](/user/return) {Object[]} tracebuffer containing the time ordered trace records.
		   */
		  this.getTraceLog = function () {
			  return client.getTraceLog();
		  };
  
		  /**
		   * Start tracing.
		   *
		   * [@name](/user/name) Paho.MQTT.Client#startTrace
		   * [@function](/user/function)
		   */
		  this.startTrace = function () {
			  client.startTrace();
		  };
  
		  /**
		   * Stop tracing.
		   *
		   * [@name](/user/name) Paho.MQTT.Client#stopTrace
		   * [@function](/user/function)
		   */
		  this.stopTrace = function () {
			  client.stopTrace();
		  };
  
		  this.isConnected = function() {
			  return client.connected;
		  };
	  };
  
	  Client.prototype = {
		  get host() { return this._getHost(); },
		  set host(newHost) { this._setHost(newHost); },
  
		  get port() { return this._getPort(); },
		  set port(newPort) { this._setPort(newPort); },
  
		  get path() { return this._getPath(); },
		  set path(newPath) { this._setPath(newPath); },
  
		  get clientId() { return this._getClientId(); },
		  set clientId(newClientId) { this._setClientId(newClientId); },
  
		  get onConnected() { return this._getOnConnected(); },
		  set onConnected(newOnConnected) { this._setOnConnected(newOnConnected); },
  
		  get disconnectedPublishing() { return this._getDisconnectedPublishing(); },
		  set disconnectedPublishing(newDisconnectedPublishing) { this._setDisconnectedPublishing(newDisconnectedPublishing); },
  
		  get disconnectedBufferSize() { return this._getDisconnectedBufferSize(); },
		  set disconnectedBufferSize(newDisconnectedBufferSize) { this._setDisconnectedBufferSize(newDisconnectedBufferSize); },
  
		  get onConnectionLost() { return this._getOnConnectionLost(); },
		  set onConnectionLost(newOnConnectionLost) { this._setOnConnectionLost(newOnConnectionLost); },
  
		  get onMessageDelivered() { return this._getOnMessageDelivered(); },
		  set onMessageDelivered(newOnMessageDelivered) { this._setOnMessageDelivered(newOnMessageDelivered); },
  
		  get onMessageArrived() { return this._getOnMessageArrived(); },
		  set onMessageArrived(newOnMessageArrived) { this._setOnMessageArrived(newOnMessageArrived); },
  
		  get trace() { return this._getTrace(); },
		  set trace(newTraceFunction) { this._setTrace(newTraceFunction); }
  
	  };
  
	  /**
	   * An application message, sent or received.
	   * <p>
	   * All attributes may be null, which implies the default values.
	   *
	   * [@name](/user/name) Paho.MQTT.Message
	   * [@constructor](/user/constructor)
	   * [@param](/user/param) {String|ArrayBuffer} payload The message data to be sent.
	   * <p>
	   * [@property](/user/property) {string} payloadString <i>read only</i> The payload as a string if the payload consists of valid UTF-8 characters.
	   * [@property](/user/property) {ArrayBuffer} payloadBytes <i>read only</i> The payload as an ArrayBuffer.
	   * <p>
	   * [@property](/user/property) {string} destinationName <b>mandatory</b> The name of the destination to which the message is to be sent
	   *                    (for messages about to be sent) or the name of the destination from which the message has been received.
	   *                    (for messages received by the onMessage function).
	   * <p>
	   * [@property](/user/property) {number} qos The Quality of Service used to deliver the message.
	   * <dl>
	   *     <dt>0 Best effort (default).
	   *     <dt>1 At least once.
	   *     <dt>2 Exactly once.
	   * </dl>
	   * <p>
	   * [@property](/user/property) {Boolean} retained If true, the message is to be retained by the server and delivered
	   *                     to both current and future subscriptions.
	   *                     If false the server only delivers the message to current subscribers, this is the default for new Messages.
	   *                     A received message has the retained boolean set to true if the message was published
	   *                     with the retained boolean set to true
	   *                     and the subscrption was made after the message has been published.
	   * <p>
	   * [@property](/user/property) {Boolean} duplicate <i>read only</i> If true, this message might be a duplicate of one which has already been received.
	   *                     This is only set on messages received from the server.
	   *
	   */
	  var Message = function (newPayload) {
		  var payload;
		  if (   typeof newPayload === "string" ||
		  newPayload instanceof ArrayBuffer ||
		  newPayload instanceof Int8Array   ||
		  newPayload instanceof Uint8Array  ||
		  newPayload instanceof Int16Array  ||
		  newPayload instanceof Uint16Array ||
		  newPayload instanceof Int32Array  ||
		  newPayload instanceof Uint32Array ||
		  newPayload instanceof Float32Array ||
		  newPayload instanceof Float64Array
			 ) {
			  payload = newPayload;
		  } else {
			  throw (format(ERROR.INVALID_ARGUMENT, [newPayload, "newPayload"]));
		  }
  
		  this._getPayloadString = function () {
			  if (typeof payload === "string")
				  return payload;
			  else
				  return parseUTF8(payload, 0, payload.length);
		  };
  
		  this._getPayloadBytes = function() {
			  if (typeof payload === "string") {
				  var buffer = new ArrayBuffer(UTF8Length(payload));
				  var byteStream = new Uint8Array(buffer);
				  stringToUTF8(payload, byteStream, 0);
  
				  return byteStream;
			  } else {
				  return payload;
			  }
		  };
  
		  var destinationName;
		  this._getDestinationName = function() { return destinationName; };
		  this._setDestinationName = function(newDestinationName) {
			  if (typeof newDestinationName === "string")
				  destinationName = newDestinationName;
			  else
				  throw new Error(format(ERROR.INVALID_ARGUMENT, [newDestinationName, "newDestinationName"]));
		  };
  
		  var qos = 0;
		  this._getQos = function() { return qos; };
		  this._setQos = function(newQos) {
			  if (newQos === 0 || newQos === 1 || newQos === 2 )
				  qos = newQos;
			  else
				  throw new Error("Invalid argument:"+newQos);
		  };
  
		  var retained = false;
		  this._getRetained = function() { return retained; };
		  this._setRetained = function(newRetained) {
			  if (typeof newRetained === "boolean")
				  retained = newRetained;
			  else
				  throw new Error(format(ERROR.INVALID_ARGUMENT, [newRetained, "newRetained"]));
		  };
  
		  var duplicate = false;
		  this._getDuplicate = function() { return duplicate; };
		  this._setDuplicate = function(newDuplicate) { duplicate = newDuplicate; };
	  };
  
	  Message.prototype = {
		  get payloadString() { return this._getPayloadString(); },
		  get payloadBytes() { return this._getPayloadBytes(); },
  
		  get destinationName() { return this._getDestinationName(); },
		  set destinationName(newDestinationName) { this._setDestinationName(newDestinationName); },
  
		  get topic() { return this._getDestinationName(); },
		  set topic(newTopic) { this._setDestinationName(newTopic); },
  
		  get qos() { return this._getQos(); },
		  set qos(newQos) { this._setQos(newQos); },
  
		  get retained() { return this._getRetained(); },
		  set retained(newRetained) { this._setRetained(newRetained); },
  
		  get duplicate() { return this._getDuplicate(); },
		  set duplicate(newDuplicate) { this._setDuplicate(newDuplicate); }
	  };
  
	  // Module contents.
	  return {
		  Client: Client,
		  Message: Message,
		  ParseUTF8:parseUTF8
	  };
  })(window);
  return PahoMQTT;
  });

@Leo501

 paho-mqtt.js 封装库 放在  paho-mqtt.js同一个目录下,使用的时候就用这个文件引出的库

‘use strict’; /** * Created by liangdas on 17/2/25. * https://github.com/eclipse/paho.mqtt.javascript * Email 1587790525@qq.com */ var hashmap = function () {}; hashmap.prototype = { constructor: hashmap, add: function (k, v) { if (!this.hasOwnProperty(k)) { this[k] = v; } }, remove: function (k) { if (this.hasOwnProperty(k)) { delete this[k]; } }, update: function (k, v) { this[k] = v; }, has: function (k) { var type = typeof k; if (type === ‘string’ || type === ‘number’) { return this.hasOwnProperty(k); } else if (type === ‘function’ && this.some(k)) { return true; } return false; }, clear: function () { for (var k in this) { if (this.hasOwnProperty(k)) { delete this[k]; } } }, empty: function () { for (var k in this) { if (this.hasOwnProperty(k)) { return false; } } return true; }, each: function (fn) { for (var k in this) { if (this.hasOwnProperty(k)) { fn.call(this, this[k], k, this); } } }, map: function (fn) { var hash = new Hash; for (var k in this) { if (this.hasOwnProperty(k)) { hash.add(k, fn.call(this, this[k], k, this)); } } return hash; }, filter: function (fn) { var hash = new Hash; for (var k in this) {

			}
		},
		join: function (split) {
			split = split !== undefined ? split : ',';
			var rst = [];
			this.each(function (v) {
				rst.push(v);
			});
			return rst.join(split);
		},
		every: function (fn) {
			for (var k in this) {
				if (this.hasOwnProperty(k)) {
					if (!fn.call(this, this[k], k, this)) {
						return false;
					}
				}
			}
			return true;
		},
		some: function (fn) {
			for (var k in this) {
				if (this.hasOwnProperty(k)) {
					if (fn.call(this, this[k], k, this)) {
						return true;
					}
				}
			}
			return false;
		},
		find: function (k) {
			var type = typeof k;
			if (type === 'string' || type === 'number' && this.has(k)) {
				return this[k];
			} else if (type === 'function') {
				for (var _k in this) {
					if (this.hasOwnProperty(_k) && k.call(this, this[_k], _k, this)) {
						return this[_k];
					}
				}
			}
			return null;
		}
	};
	
	var mqantlib=function(mqtt){
		var mqant = cc.Class({
			properties: {
				curr_id: 0,
				waiting_queue:null,
			},
			ctor:function(){
				this.waiting_queue=new hashmap();
			},
			init:function(prop,context){
				var self=this;
				self.connectcallback=prop["connect"];
				self.errorcallback=prop["error"];
				self.closecallback=prop["close"];
				self.reconnectcallback=prop["reconnect"];
				self.context=context;
				if((self.client!=null)&&self.client.connected){
					return true;
				}
				prop["connect"]=function () {
					self.client.connected=true;
					var args = new Array();
					for(var k in arguments){
						args.push(arguments[k]);
					}
					if(self.connectcallback){
						self.connectcallback.apply(self.context,args)
					}
				}
				prop["error"]=function () {
					self.client.connected=false;
					var args = new Array();
					for(var k in arguments){
						args.push(arguments[k]);
					}
					if(self.errorcallback){
						self.errorcallback.apply(self.context,args)
					}
				}
	
				prop["close"]=function () {
					self.client.connected=false;
					var args = new Array();
					for(var k in arguments){
						args.push(arguments[k]);
					}
					if(self.closecallback){
						self.closecallback.apply(self.context,args)
					}
				}
	
				prop["reconnect"]=function () {
					self.client.connected=false;
					var args = new Array();
					for(var k in arguments){
						args.push(arguments[k]);
					}
					if(self.reconnectcallback){
						self.reconnectcallback.apply(self.context,args)
					}
				}
	
				// this.client = mqtt.connect(prop["uri"],{
				
				// //var client = mqtt.connect("egret://127.0.0.1:3653",{
				// //var client = mqtt.connect("laya://127.0.0.1:3653",{
				//     protocolId: 'MQIsdp',
				//     protocolVersion: 3,
				//     clientId:'mqttjs_' + Math.random().toString(16).substr(2, 8),
				//     reconnectPeriod:0, //不自动重连
				// }) // you add a ws:// url here
				// this.client.on('connect', prop["connect"]);
				// this.client.on('reconnect', prop["reconnect"]);
				// this.client.on('error', prop["error"]);
				// this.client.on('close', prop["close"]);
				// this.client.on("message", onMessageArrived);
				// var self=this;
				// function onMessageArrived(topic, payload) {
				//     try{
				//         var callback=self.waiting_queue.find(topic);
				//         if(callback!=null){
				//             //有等待消息的callback 还缺一个信息超时的处理机制
				//             var h=topic.split("/");
				//             if(h.length>2){
				//                 //这个topic存在msgid 那么这个回调只使用一次
				//                 self.waiting_queue.remove(topic)
				//             }
				//             callback["callback"].call(callback["callbackContext"],topic,payload)
				//         }
				//     }catch(e) {
				//         console.log(e);
				//     }
				//}
				prop["useSSL"]=prop["useSSL"]||false
				prop["host"]=prop["host"]||""
				prop["port"]=prop["port"]||0
				prop["client_id"]=prop["client_id"]||'mqttjs_' + Math.random().toString(16).substr(2, 8);
				self.client = new mqtt.Client(prop["host"], prop["port"], prop["client_id"]);
				var connectOptions={
					//onSuccess: prop["connect"],
					onFailure: prop["error"],
					mqttVersion: 3,
					useSSL:prop["useSSL"],
					cleanSession: true,
					reconnect:true,
					timeout:5
				}
				if(prop["uri"]){
					connectOptions.uris=[prop["uri"]]
				}
				self.client.connect(connectOptions);//连接服务器并注册连接成功处理事件
				self.client.onConnected=prop["connect"];
				self.client.onConnectionLost =prop["close"] ;//注册连接断开处理事件
				self.client.onMessageArrived = onMessageArrived;//注册消息接收处理事件
				
				
				function onMessageArrived(message) {
					try{
						var callback=self.waiting_queue.find(message.destinationName);
						if(callback!=null){
							//有等待消息的callback 还缺一个信息超时的处理机制
							var h=message.destinationName.split("/");
							if(h.length>2){
								//这个topic存在msgid 那么这个回调只使用一次
								self.waiting_queue.remove(message.destinationName)
							}
							callback["callback"].call(callback["callbackContext"],message.destinationName,message.payloadBytes)
						}
					}catch(e) {
						console.log(e);
					}
				}
			},
			/**
			 * 向服务器发送一条消息
			 * [@param](/user/param) topic
			 * [@param](/user/param) msg
			 * [@param](/user/param) callback
			 */
			request:function(topic,msg,callback,callbackContext){
				this.curr_id=this.curr_id+1
				var topic=topic+"/"+this.curr_id //给topic加一个msgid 这样服务器就会返回这次请求的结果,否则服务器不会返回结果
				var payload=JSON.stringify(msg)
				this.on(topic,callback,callbackContext)
				this.client.publish(topic,payload ,0,false);
			},
			/**
			 * 向服务器发送一条消息,但不要求服务器返回结果
			 * [@param](/user/param) topic
			 * [@param](/user/param) msg
			 */
			requestNR:function(topic,msg){
				var payload=JSON.stringify(msg)
				this.client.publish(topic,payload ,0,false);
			},
			/**
			 * 监听指定类型的topic消息
			 * [@param](/user/param) topic
			 * [@param](/user/param) callback
			 */
			on:function(topic,callback,callbackContext){
				//服务器不会返回结果
				if(callbackContext===null){
					callbackContext=this;
				}
				this.waiting_queue.remove(topic);
				this.waiting_queue.add(topic,{
					"callback":callback,
					"callbackContext":callbackContext
				}) //添加这条消息到等待队列
			},
			clearCallback:function () {
				this.waiting_queue.clear();
			},
			destroy:function(){
				this.client.disconnect();
				this.waiting_queue.clear();
			},
			parseUTF8:function(payload){
				if (typeof payload === "string")
					return payload;
				else
					return mqtt.ParseUTF8(payload, 0, payload.length);
			}
		})
		return  mqant
	};
	
	(function (window, factory) {
		var mqtt=require("./paho-mqtt");
		if (typeof exports === 'object') {
			module.exports = factory(mqtt);
		} else if (typeof define === 'function' && define.amd) {
			define(["Paho"],factory);
		} else {
			window.mqant = factory(mqtt);
		}
	})(this,function(mqtt){
		var mqant=mqantlib(mqtt);
		return mqant
	});
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