delete devdependencies modules

es/Client.js

+import _typeof from "@babel/runtime/helpers/esm/typeof";
+import ClientImplementation from './ClientImplementation';
+import { ERROR } from './consts';
+/* eslint-disable */
+
+var Client = function Client(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 ClientImplementation(uri, host, port, path, clientId); //Public Properties
+
+  Object.defineProperties(this, {
+    host: {
+      get: function get() {
+        return host;
+      },
+      set: function set() {
+        throw new Error(format(ERROR.UNSUPPORTED_OPERATION));
+      }
+    },
+    port: {
+      get: function get() {
+        return port;
+      },
+      set: function set() {
+        throw new Error(format(ERROR.UNSUPPORTED_OPERATION));
+      }
+    },
+    path: {
+      get: function get() {
+        return path;
+      },
+      set: function set() {
+        throw new Error(format(ERROR.UNSUPPORTED_OPERATION));
+      }
+    },
+    uri: {
+      get: function get() {
+        return uri;
+      },
+      set: function set() {
+        throw new Error(format(ERROR.UNSUPPORTED_OPERATION));
+      }
+    },
+    clientId: {
+      get: function get() {
+        return client.clientId;
+      },
+      set: function set() {
+        throw new Error(format(ERROR.UNSUPPORTED_OPERATION));
+      }
+    },
+    onConnected: {
+      get: function get() {
+        return client.onConnected;
+      },
+      set: function set(newOnConnected) {
+        if (typeof newOnConnected === 'function') client.onConnected = newOnConnected;else throw new Error(format(ERROR.INVALID_TYPE, [_typeof(newOnConnected), 'onConnected']));
+      }
+    },
+    disconnectedPublishing: {
+      get: function get() {
+        return client.disconnectedPublishing;
+      },
+      set: function set(newDisconnectedPublishing) {
+        client.disconnectedPublishing = newDisconnectedPublishing;
+      }
+    },
+    disconnectedBufferSize: {
+      get: function get() {
+        return client.disconnectedBufferSize;
+      },
+      set: function set(newDisconnectedBufferSize) {
+        client.disconnectedBufferSize = newDisconnectedBufferSize;
+      }
+    },
+    onConnectionLost: {
+      get: function get() {
+        return client.onConnectionLost;
+      },
+      set: function set(newOnConnectionLost) {
+        if (typeof newOnConnectionLost === 'function') client.onConnectionLost = newOnConnectionLost;else throw new Error(format(ERROR.INVALID_TYPE, [_typeof(newOnConnectionLost), 'onConnectionLost']));
+      }
+    },
+    onMessageDelivered: {
+      get: function get() {
+        return client.onMessageDelivered;
+      },
+      set: function set(newOnMessageDelivered) {
+        if (typeof newOnMessageDelivered === 'function') client.onMessageDelivered = newOnMessageDelivered;else throw new Error(format(ERROR.INVALID_TYPE, [_typeof(newOnMessageDelivered), 'onMessageDelivered']));
+      }
+    },
+    onMessageArrived: {
+      get: function get() {
+        return client.onMessageArrived;
+      },
+      set: function set(newOnMessageArrived) {
+        if (typeof newOnMessageArrived === 'function') client.onMessageArrived = newOnMessageArrived;else throw new Error(format(ERROR.INVALID_TYPE, [_typeof(newOnMessageArrived), 'onMessageArrived']));
+      }
+    },
+    trace: {
+      get: function get() {
+        return client.traceFunction;
+      },
+      set: function set(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 Paho.Client#connect
+   * @function
+   * @param {object} connectOptions - Attributes used with the connection.
+   * @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 {string} connectOptions.userName - Authentication username for this connection.
+   * @param {string} connectOptions.password - Authentication password for this connection.
+   * @param {Paho.Message} connectOptions.willMessage - sent by the server when the client
+   *                    disconnects abnormally.
+   * @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 {boolean} connectOptions.cleanSession - if true(default) the client and server
+   *                    persistent state is deleted on successful connect.
+   * @param {boolean} connectOptions.useSSL - if present and true, use an SSL Websocket connection.
+   * @param {object} connectOptions.invocationContext - passed to the onSuccess callback or onFailure callback.
+   * @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 {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 {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 {array} connectOptions.ports - If present the set of ports matching the hosts. If hosts contains URIs, this property
+   * is not used.
+   * @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 {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 {boolean} connectOptions.mqttVersionExplicit - If set to true, will force the connection to use the
+   * selected MQTT Version or will fail to connect.
+   * @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 {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 Paho.Client#subscribe
+   * @function
+   * @param {string} filter describing the destinations to receive messages from.
+   * <br>
+   * @param {object} subscribeOptions - used to control the subscription
+   *
+   * @param {number} subscribeOptions.qos - the maximum qos of any publications sent
+   *                                  as a result of making this subscription.
+   * @param {object} subscribeOptions.invocationContext - passed to the onSuccess callback
+   *                                  or onFailure callback.
+   * @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 {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 {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 {InvalidState} if the client is not in connected state.
+   */
+
+
+  this.subscribe = function (filter, subscribeOptions) {
+    if (typeof filter !== 'string' && filter.constructor !== Array) 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 Paho.Client#unsubscribe
+  * @function
+  * @param {string} filter - describing the destinations to receive messages from.
+  * @param {object} unsubscribeOptions - used to control the subscription
+  * @param {object} unsubscribeOptions.invocationContext - passed to the onSuccess callback
+                                      or onFailure callback.
+  * @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 {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 {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 {InvalidState} if the client is not in connected state.
+  */
+
+
+  this.unsubscribe = function (filter, unsubscribeOptions) {
+    if (typeof filter !== 'string' && filter.constructor !== Array) 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 Paho.Client#send
+   * @function
+   * @param {string|Paho.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.Message object.
+   * @param {String|ArrayBuffer} payload - The message data to be sent.
+   * @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 {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 {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 Paho.Client#publish
+   * @function
+   * @param {string|Paho.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.Message object.
+   * @param {String|ArrayBuffer} payload - The message data to be published.
+   * @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 {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 {InvalidState} if the client is not connected.
+   */
+
+
+  this.publish = 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);
+    }
+  };
+  /**
+   * Normal disconnect of this Messaging client from its server.
+   *
+   * @name Paho.Client#disconnect
+   * @function
+   * @throws {InvalidState} if the client is already disconnected.
+   */
+
+
+  this.disconnect = function () {
+    client.disconnect();
+  };
+  /**
+   * Get the contents of the trace log.
+   *
+   * @name Paho.Client#getTraceLog
+   * @function
+   * @return {Object[]} tracebuffer containing the time ordered trace records.
+   */
+
+
+  this.getTraceLog = function () {
+    return client.getTraceLog();
+  };
+  /**
+   * Start tracing.
+   *
+   * @name Paho.Client#startTrace
+   * @function
+   */
+
+
+  this.startTrace = function () {
+    client.startTrace();
+  };
+  /**
+   * Stop tracing.
+   *
+   * @name Paho.Client#stopTrace
+   * @function
+   */
+
+
+  this.stopTrace = function () {
+    client.stopTrace();
+  };
+
+  this.isConnected = function () {
+    return client.connected;
+  };
+};
+
+export default Client;
\ No newline at end of file

es/ClientImplementation.js

+import { CONNACK_RC, ERROR, MESSAGE_TYPE } from './consts';
+import Message from './Message';
+import Pinger from './Pinger';
+import { decodeMessage, format } from './utils';
+/* eslint-disable */
+
+var Timeout = function Timeout(client, timeoutSeconds, action, args) {
+  if (!timeoutSeconds) timeoutSeconds = 30;
+
+  var doTimeout = function doTimeout(action, client, args) {
+    return function () {
+      return action.apply(client, args);
+    };
+  };
+
+  this.timeout = setTimeout(doTimeout(action, client, args), timeoutSeconds * 1000);
+
+  this.cancel = function () {
+    clearTimeout(this.timeout);
+  };
+};
+/* eslint-disable */
+
+
+var ClientImplementationementation = function ClientImplementationementation(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 (!('ArrayBuffer' in global && global.ArrayBuffer !== null)) {
+    throw new Error(format(ERROR.UNSUPPORTED, ['ArrayBuffer']));
+  }
+
+  this._trace('Paho.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.
+
+
+ClientImplementation.prototype.host = null;
+ClientImplementation.prototype.port = null;
+ClientImplementation.prototype.path = null;
+ClientImplementation.prototype.uri = null;
+ClientImplementation.prototype.clientId = null; // Messaging Client private instance members.
+
+ClientImplementation.prototype.socket = null;
+/* true once we have received an acknowledgement to a CONNECT packet. */
+
+ClientImplementation.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.
+ */
+
+ClientImplementation.prototype.maxMessageIdentifier = 65536;
+ClientImplementation.prototype.connectOptions = null;
+ClientImplementation.prototype.hostIndex = null;
+ClientImplementation.prototype.onConnected = null;
+ClientImplementation.prototype.onConnectionLost = null;
+ClientImplementation.prototype.onMessageDelivered = null;
+ClientImplementation.prototype.onMessageArrived = null;
+ClientImplementation.prototype.traceFunction = null;
+ClientImplementation.prototype._msg_queue = null;
+ClientImplementation.prototype._buffered_msg_queue = null;
+ClientImplementation.prototype._connectTimeout = null;
+/* The sendPinger monitors how long we allow before we send data to prove to the server that we are alive. */
+
+ClientImplementation.prototype.sendPinger = null;
+/* The receivePinger monitors how long we allow before we require evidence that the server is alive. */
+
+ClientImplementation.prototype.receivePinger = null;
+ClientImplementation.prototype._reconnectInterval = 1; // Reconnect Delay, starts at 1 second
+
+ClientImplementation.prototype._reconnecting = false;
+ClientImplementation.prototype._reconnectTimeout = null;
+ClientImplementation.prototype.disconnectedPublishing = false;
+ClientImplementation.prototype.disconnectedBufferSize = 5000;
+ClientImplementation.prototype.receiveBuffer = null;
+ClientImplementation.prototype._traceBuffer = null;
+ClientImplementation.prototype._MAX_TRACE_ENTRIES = 100;
+
+ClientImplementation.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);
+  }
+};
+
+ClientImplementation.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.constructor === Array ? filter : [filter];
+  if (subscribeOptions.qos === undefined) subscribeOptions.qos = 0;
+  wireMessage.requestedQos = [];
+
+  for (var i = 0; i < wireMessage.topics.length; i++) {
+    wireMessage.requestedQos[i] = subscribeOptions.qos;
+  }
+
+  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, 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 */
+
+
+ClientImplementation.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.constructor === Array ? filter : [filter];
+
+  if (unsubscribeOptions.onSuccess) {
+    wireMessage.callback = function () {
+      unsubscribeOptions.onSuccess({
+        invocationContext: unsubscribeOptions.invocationContext
+      });
+    };
+  }
+
+  if (unsubscribeOptions.timeout) {
+    wireMessage.timeOut = new Timeout(this, 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);
+};
+
+ClientImplementation.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; // Add messages in fifo order to array, by adding to start
+
+          this._buffered_msg_queue.unshift(wireMessage);
+        }
+      }
+    } else {
+      throw new Error(format(ERROR.INVALID_STATE, ['not connected']));
+    }
+  }
+};
+
+ClientImplementation.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']));
+  var 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);
+};
+
+ClientImplementation.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;
+  }
+};
+
+ClientImplementation.prototype.startTrace = function () {
+  if (this._traceBuffer === null) {
+    this._traceBuffer = [];
+  }
+
+  this._trace('Client.startTrace', new Date(), version);
+};
+
+ClientImplementation.prototype.stopTrace = function () {
+  delete this._traceBuffer;
+};
+
+ClientImplementation.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, this.connectOptions.keepAliveInterval);
+  this.receivePinger = new Pinger(this, this.connectOptions.keepAliveInterval);
+
+  if (this._connectTimeout) {
+    this._connectTimeout.cancel();
+
+    this._connectTimeout = null;
+  }
+
+  this._connectTimeout = new Timeout(this, 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.
+
+
+ClientImplementation.prototype._schedule_message = function (message) {
+  // Add messages in fifo order to array, by adding to start
+  this._msg_queue.unshift(message); // Process outstanding messages in the queue if we have an  open socket, and have received CONNACK.
+
+
+  if (this.connected) {
+    this._process_queue();
+  }
+};
+
+ClientImplementation.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, [prefix + this._localKey + wireMessage.messageIdentifier, storedMessage]));
+  }
+
+  localStorage.setItem(prefix + this._localKey + wireMessage.messageIdentifier, JSON.stringify(storedMessage));
+};
+
+ClientImplementation.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;
+  }
+};
+
+ClientImplementation.prototype._process_queue = function () {
+  var message = null; // Send all queued messages down socket connection
+
+  while (message = this._msg_queue.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
+ */
+
+
+ClientImplementation.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
+ */
+
+
+ClientImplementation.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
+ */
+
+
+ClientImplementation.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]);
+  }
+};
+
+ClientImplementation.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;
+};
+
+ClientImplementation.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;
+
+          while (msg = this._buffered_msg_queue.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 */
+
+
+ClientImplementation.prototype._on_socket_error = function (error) {
+  if (!this._reconnecting) {
+    this._disconnected(ERROR.SOCKET_ERROR.code, format(ERROR.SOCKET_ERROR, [error.data]));
+  }
+};
+/** @ignore */
+
+
+ClientImplementation.prototype._on_socket_close = function () {
+  if (!this._reconnecting) {
+    this._disconnected(ERROR.SOCKET_CLOSE.code, format(ERROR.SOCKET_CLOSE));
+  }
+};
+/** @ignore */
+
+
+ClientImplementation.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 */
+
+
+ClientImplementation.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=' + wireMessage.payloadMessage.qos);
+  }
+};
+/** @ignore */
+
+
+ClientImplementation.prototype._receiveMessage = function (wireMessage) {
+  if (this.onMessageArrived) {
+    this.onMessageArrived(wireMessage.payloadMessage);
+  }
+};
+/**
+ * Client has connected.
+ * @param {reconnect} [boolean] indicate if this was a result of reconnect operation.
+ * @param {uri} [string] fully qualified WebSocket URI of the server.
+ */
+
+
+ClientImplementation.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.
+ */
+
+
+ClientImplementation.prototype._reconnect = function () {
+  this._trace('Client._reconnect');
+
+  if (!this.connected) {
+    this._reconnecting = true;
+    this.sendPinger.cancel();
+    this.receivePinger.cancel();
+    if (this._reconnectInterval < 128) 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 {errorCode} [number] the error number.
+ * @param {errorText} [string] the error text.
+ * @ignore
+ */
+
+
+ClientImplementation.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, 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 */
+
+
+ClientImplementation.prototype._trace = function () {
+  // Pass trace message back to client's callback function
+  if (this.traceFunction) {
+    var args = Array.prototype.slice.call(arguments);
+
+    for (var i in args) {
+      if (typeof args[i] !== 'undefined') args.splice(i, 1, JSON.stringify(args[i]));
+    }
+
+    var record = args.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 */
+
+
+ClientImplementation.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;
+};
+
+export default ClientImplementationementation;
\ No newline at end of file

es/Message.js

+import _classCallCheck from "@babel/runtime/helpers/esm/classCallCheck";
+import _createClass from "@babel/runtime/helpers/esm/createClass";
+import { ERROR } from './consts';
+import { format, parseUTF8, stringToUTF8, UTF8Length } from './utils';
+/* eslint-disable */
+
+var Message = /*#__PURE__*/function () {
+  function Message(newPayload) {
+    _classCallCheck(this, Message);
+
+    this.payload;
+    this._destinationName = '';
+    this._qos = 0;
+    this._retained = false;
+    this._duplicate = false;
+    this._stringPayload = null;
+
+    if (typeof newPayload === "string" || newPayload instanceof ArrayBuffer || ArrayBuffer.isView(newPayload) && !(newPayload instanceof DataView)) {
+      payload = newPayload;
+    } else {
+      throw format(ERROR.INVALID_ARGUMENT, [newPayload, "newPayload"]);
+    }
+  }
+
+  _createClass(Message, [{
+    key: "payloadString",
+    get: function get() {
+      if (typeof this.payload === 'string') return this.payload;else return parseUTF8(this.payload, 0, this.payload.length);
+    }
+  }, {
+    key: "payloadBytes",
+    get: function get() {
+      var payload = this.payload;
+
+      if (typeof payload === 'string') {
+        var buffer = new ArrayBuffer(UTF8Length(payload));
+        var byteStream = new Uint8Array(buffer);
+        stringToUTF8(payload, byteStream, 0);
+        return byteStream;
+      } else {
+        return payload;
+      }
+    }
+  }, {
+    key: "destinationName",
+    get: function get() {
+      return this._destinationName;
+    },
+    set: function set(newDestinationName) {
+      if (typeof newDestinationName === 'string') this._destinationName = newDestinationName;else throw new Error(format(ERROR.INVALID_ARGUMENT, [newDestinationName, 'newDestinationName']));
+    }
+  }, {
+    key: "qos",
+    get: function get() {
+      return this._qos;
+    },
+    set: function set(newQos) {
+      if (newQos === 0 || newQos === 1 || newQos === 2) this._qos = newQos;else throw new Error('Invalid argument:' + newQos);
+    }
+  }, {
+    key: "retained",
+    get: function get() {
+      return this._retained;
+    },
+    set: function set(newRetained) {
+      if (typeof newRetained === 'boolean') this._retained = newRetained;else throw new Error(format(ERROR.INVALID_ARGUMENT, [newRetained, 'newRetained']));
+    }
+  }, {
+    key: "topic",
+    get: function get() {
+      return this.destinationName;
+    },
+    set: function set(newTopic) {
+      this.destinationName = newTopic;
+    }
+  }, {
+    key: "duplicate",
+    get: function get() {
+      return this._duplicate;
+    },
+    set: function set(newDuplicate) {
+      this._duplicate = newDuplicate;
+    }
+  }, {
+    key: "stringPayload",
+    get: function get() {
+      return this._stringPayload;
+    },
+    set: function set(newStringPayload) {
+      this._stringPayload = newStringPayload;
+    }
+  }]);
+
+  return Message;
+}();
+
+export default Message;
\ No newline at end of file

es/Pinger.js

+import { ERROR, MESSAGE_TYPE } from './consts';
+import { format } from './utils';
+import WireMessage from './WireMessage';
+/* eslint-disable */
+
+var Pinger = function Pinger(client, keepAliveInterval) {
+  this._client = client;
+  this._keepAliveInterval = keepAliveInterval * 1000;
+  this.isReset = false;
+  var pingReq = new WireMessage(MESSAGE_TYPE.PINGREQ).encode();
+
+  var doTimeout = function doTimeout(pinger) {
+    return function () {
+      return doPing.apply(pinger);
+    };
+  };
+  /** @ignore */
+
+
+  var doPing = function doPing() {
+    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 = setTimeout(doTimeout(this), this._keepAliveInterval);
+    }
+  };
+
+  this.reset = function () {
+    this.isReset = true;
+    clearTimeout(this.timeout);
+    if (this._keepAliveInterval > 0) this.timeout = setTimeout(doTimeout(this), this._keepAliveInterval);
+  };
+
+  this.cancel = function () {
+    clearTimeout(this.timeout);
+  };
+};
+
+export default Pinger;
\ No newline at end of file

es/WireMessage.js

+import _classCallCheck from "@babel/runtime/helpers/esm/classCallCheck";
+import _createClass from "@babel/runtime/helpers/esm/createClass";
+import { MESSAGE_TYPE, MqttProtoIdentifierv3, MqttProtoIdentifierv4 } from './consts';
+import { encodeMBI, UTF8Length, writeString, writeUint16 } from './utils';
+/* eslint-disable */
+// interface WireMessageOptions {
+//     messageIdentifier?: number
+//     mqttVersion?: 3 | 4
+//     clientId?: string
+//     willMessage?: MqttMessage
+//     userName?: string
+//     password?: string
+//     topics?: string[]
+//     requestedQos?: (0 | 1 | 2)[]
+//     payloadMessage?: MqttMessage
+//     cleanSession?: boolean
+//     keepAliveInterval?: number
+//     [key: string]: any
+//   }
+
+var WireMessage = /*#__PURE__*/function () {
+  function WireMessage(type, options) {
+    _classCallCheck(this, WireMessage);
+
+    this.type = type;
+
+    for (var name in options) {
+      if (options.hasOwnProperty(name)) {
+        this[name] = options[name];
+      }
+    }
+  }
+
+  _createClass(WireMessage, [{
+    key: "encode",
+    value: function encode() {
+      // 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;
+    }
+  }]);
+
+  return WireMessage;
+}();
+
+export default WireMessage;
\ No newline at end of file

es/consts.js

+/* eslint-disable */
+export 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
+};
+/**
+ * Unique message type identifiers, with associated
+ * associated integer values.
+ * @private
+ */
+
+export 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. */
+
+export 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"
+}; //MQTT protocol and version          6    M    Q    I    s    d    p    3
+
+export var MqttProtoIdentifierv3 = [0x00, 0x06, 0x4d, 0x51, 0x49, 0x73, 0x64, 0x70, 0x03]; //MQTT proto/version for 311         4    M    Q    T    T    4
+
+export var MqttProtoIdentifierv4 = [0x00, 0x04, 0x4d, 0x51, 0x54, 0x54, 0x04];
\ No newline at end of file

es/index.js

+import Client from './Client';
+import Message from './Message';
+/* eslint-disable */
+
+var MqttClient = {
+  Client: Client,
+  Message: Message
+};
+export default MqttClient;
\ No newline at end of file

es/utils.js

+import _typeof from "@babel/runtime/helpers/esm/typeof";
+import { ERROR, MESSAGE_TYPE } from './consts';
+import Message from './Message';
+/* eslint-disable */
+
+/**
+	 * 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 {Object} obj - User options object
+	 * @param {Object} keys - valid keys and types that may exist in obj.
+	 * @throws {Error} Invalid option parameter found.
+	 * @private
+	 */
+
+export var validate = function validate(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);
+      }
+    }
+  }
+};
+/**
+* Format an error message text.
+* @private
+* @param {error} ERROR value above.
+* @param {substitutions} [array] substituted into the text.
+* @return the text with the substitutions made.
+*/
+
+export var format = function format(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;
+};
+export 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];
+}
+export function writeUint16(input, buffer, offset) {
+  buffer[offset++] = input >> 8; //MSB
+
+  buffer[offset++] = input % 256; //LSB
+
+  return offset;
+}
+export function writeString(input, utf8Length, buffer, offset) {
+  offset = writeUint16(utf8Length, buffer, offset);
+  stringToUTF8(input, buffer, offset);
+  return offset + utf8Length;
+}
+export function readUint16(buffer, offset) {
+  return 256 * buffer[offset] + buffer[offset + 1];
+}
+/**
+* Encodes an MQTT Multi-Byte Integer
+* @private
+*/
+
+export 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
+*/
+
+export 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
+*/
+
+export 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;
+}
+export 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;
+}
\ No newline at end of file

lib/Client.js

+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _typeof2 = _interopRequireDefault(require("@babel/runtime/helpers/typeof"));
+
+var _ClientImplementation = _interopRequireDefault(require("./ClientImplementation"));
+
+var _consts = require("./consts");
+
+/* eslint-disable */
+var Client = function Client(host, port, path, clientId) {
+  var uri;
+  if (typeof host !== 'string') throw new Error(format(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(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(_consts.ERROR.INVALID_ARGUMENT, [host, 'host']));
+    }
+  } else {
+    if (arguments.length == 3) {
+      clientId = path;
+      path = '/mqtt';
+    }
+
+    if (typeof port !== 'number' || port < 0) throw new Error(format(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(port), 'port']));
+    if (typeof path !== 'string') throw new Error(format(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(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(_consts.ERROR.INVALID_ARGUMENT, [clientId, 'clientId']));
+  var client = new _ClientImplementation.default(uri, host, port, path, clientId); //Public Properties
+
+  Object.defineProperties(this, {
+    host: {
+      get: function get() {
+        return host;
+      },
+      set: function set() {
+        throw new Error(format(_consts.ERROR.UNSUPPORTED_OPERATION));
+      }
+    },
+    port: {
+      get: function get() {
+        return port;
+      },
+      set: function set() {
+        throw new Error(format(_consts.ERROR.UNSUPPORTED_OPERATION));
+      }
+    },
+    path: {
+      get: function get() {
+        return path;
+      },
+      set: function set() {
+        throw new Error(format(_consts.ERROR.UNSUPPORTED_OPERATION));
+      }
+    },
+    uri: {
+      get: function get() {
+        return uri;
+      },
+      set: function set() {
+        throw new Error(format(_consts.ERROR.UNSUPPORTED_OPERATION));
+      }
+    },
+    clientId: {
+      get: function get() {
+        return client.clientId;
+      },
+      set: function set() {
+        throw new Error(format(_consts.ERROR.UNSUPPORTED_OPERATION));
+      }
+    },
+    onConnected: {
+      get: function get() {
+        return client.onConnected;
+      },
+      set: function set(newOnConnected) {
+        if (typeof newOnConnected === 'function') client.onConnected = newOnConnected;else throw new Error(format(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(newOnConnected), 'onConnected']));
+      }
+    },
+    disconnectedPublishing: {
+      get: function get() {
+        return client.disconnectedPublishing;
+      },
+      set: function set(newDisconnectedPublishing) {
+        client.disconnectedPublishing = newDisconnectedPublishing;
+      }
+    },
+    disconnectedBufferSize: {
+      get: function get() {
+        return client.disconnectedBufferSize;
+      },
+      set: function set(newDisconnectedBufferSize) {
+        client.disconnectedBufferSize = newDisconnectedBufferSize;
+      }
+    },
+    onConnectionLost: {
+      get: function get() {
+        return client.onConnectionLost;
+      },
+      set: function set(newOnConnectionLost) {
+        if (typeof newOnConnectionLost === 'function') client.onConnectionLost = newOnConnectionLost;else throw new Error(format(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(newOnConnectionLost), 'onConnectionLost']));
+      }
+    },
+    onMessageDelivered: {
+      get: function get() {
+        return client.onMessageDelivered;
+      },
+      set: function set(newOnMessageDelivered) {
+        if (typeof newOnMessageDelivered === 'function') client.onMessageDelivered = newOnMessageDelivered;else throw new Error(format(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(newOnMessageDelivered), 'onMessageDelivered']));
+      }
+    },
+    onMessageArrived: {
+      get: function get() {
+        return client.onMessageArrived;
+      },
+      set: function set(newOnMessageArrived) {
+        if (typeof newOnMessageArrived === 'function') client.onMessageArrived = newOnMessageArrived;else throw new Error(format(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(newOnMessageArrived), 'onMessageArrived']));
+      }
+    },
+    trace: {
+      get: function get() {
+        return client.traceFunction;
+      },
+      set: function set(trace) {
+        if (typeof trace === 'function') {
+          client.traceFunction = trace;
+        } else {
+          throw new Error(format(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(trace), 'onTrace']));
+        }
+      }
+    }
+  });
+  /**
+   * Connect this Messaging client to its server.
+   *
+   * @name Paho.Client#connect
+   * @function
+   * @param {object} connectOptions - Attributes used with the connection.
+   * @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 {string} connectOptions.userName - Authentication username for this connection.
+   * @param {string} connectOptions.password - Authentication password for this connection.
+   * @param {Paho.Message} connectOptions.willMessage - sent by the server when the client
+   *                    disconnects abnormally.
+   * @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 {boolean} connectOptions.cleanSession - if true(default) the client and server
+   *                    persistent state is deleted on successful connect.
+   * @param {boolean} connectOptions.useSSL - if present and true, use an SSL Websocket connection.
+   * @param {object} connectOptions.invocationContext - passed to the onSuccess callback or onFailure callback.
+   * @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 {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 {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 {array} connectOptions.ports - If present the set of ports matching the hosts. If hosts contains URIs, this property
+   * is not used.
+   * @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 {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 {boolean} connectOptions.mqttVersionExplicit - If set to true, will force the connection to use the
+   * selected MQTT Version or will fail to connect.
+   * @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 {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(_consts.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(_consts.ERROR.INVALID_ARGUMENT, [connectOptions.password, 'connectOptions.password']));
+
+    if (connectOptions.willMessage) {
+      if (!(connectOptions.willMessage instanceof Message)) throw new Error(format(_consts.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(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(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(_consts.ERROR.INVALID_ARGUMENT, [connectOptions.hosts, 'connectOptions.hosts']));
+      if (connectOptions.hosts.length < 1) throw new Error(format(_consts.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(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(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(_consts.ERROR.INVALID_ARGUMENT, [connectOptions.hosts[i], 'connectOptions.hosts[' + i + ']']));
+          }
+        } else if (usingURIs) {
+          throw new Error(format(_consts.ERROR.INVALID_ARGUMENT, [connectOptions.hosts[i], 'connectOptions.hosts[' + i + ']']));
+        }
+      }
+
+      if (!usingURIs) {
+        if (!connectOptions.ports) throw new Error(format(_consts.ERROR.INVALID_ARGUMENT, [connectOptions.ports, 'connectOptions.ports']));
+        if (!(connectOptions.ports instanceof Array)) throw new Error(format(_consts.ERROR.INVALID_ARGUMENT, [connectOptions.ports, 'connectOptions.ports']));
+        if (connectOptions.hosts.length !== connectOptions.ports.length) throw new Error(format(_consts.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(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(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 Paho.Client#subscribe
+   * @function
+   * @param {string} filter describing the destinations to receive messages from.
+   * <br>
+   * @param {object} subscribeOptions - used to control the subscription
+   *
+   * @param {number} subscribeOptions.qos - the maximum qos of any publications sent
+   *                                  as a result of making this subscription.
+   * @param {object} subscribeOptions.invocationContext - passed to the onSuccess callback
+   *                                  or onFailure callback.
+   * @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 {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 {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 {InvalidState} if the client is not in connected state.
+   */
+
+
+  this.subscribe = function (filter, subscribeOptions) {
+    if (typeof filter !== 'string' && filter.constructor !== Array) 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(_consts.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 Paho.Client#unsubscribe
+  * @function
+  * @param {string} filter - describing the destinations to receive messages from.
+  * @param {object} unsubscribeOptions - used to control the subscription
+  * @param {object} unsubscribeOptions.invocationContext - passed to the onSuccess callback
+                                      or onFailure callback.
+  * @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 {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 {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 {InvalidState} if the client is not in connected state.
+  */
+
+
+  this.unsubscribe = function (filter, unsubscribeOptions) {
+    if (typeof filter !== 'string' && filter.constructor !== Array) 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 Paho.Client#send
+   * @function
+   * @param {string|Paho.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.Message object.
+   * @param {String|ArrayBuffer} payload - The message data to be sent.
+   * @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 {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 {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:' + (0, _typeof2.default)(topic));
+      message = topic;
+      if (typeof message.destinationName === 'undefined') throw new Error(format(_consts.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 Paho.Client#publish
+   * @function
+   * @param {string|Paho.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.Message object.
+   * @param {String|ArrayBuffer} payload - The message data to be published.
+   * @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 {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 {InvalidState} if the client is not connected.
+   */
+
+
+  this.publish = 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:' + (0, _typeof2.default)(topic));
+      message = topic;
+      if (typeof message.destinationName === 'undefined') throw new Error(format(_consts.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 Paho.Client#disconnect
+   * @function
+   * @throws {InvalidState} if the client is already disconnected.
+   */
+
+
+  this.disconnect = function () {
+    client.disconnect();
+  };
+  /**
+   * Get the contents of the trace log.
+   *
+   * @name Paho.Client#getTraceLog
+   * @function
+   * @return {Object[]} tracebuffer containing the time ordered trace records.
+   */
+
+
+  this.getTraceLog = function () {
+    return client.getTraceLog();
+  };
+  /**
+   * Start tracing.
+   *
+   * @name Paho.Client#startTrace
+   * @function
+   */
+
+
+  this.startTrace = function () {
+    client.startTrace();
+  };
+  /**
+   * Stop tracing.
+   *
+   * @name Paho.Client#stopTrace
+   * @function
+   */
+
+
+  this.stopTrace = function () {
+    client.stopTrace();
+  };
+
+  this.isConnected = function () {
+    return client.connected;
+  };
+};
+
+var _default = Client;
+exports.default = _default;
\ No newline at end of file

lib/ClientImplementation.js

+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _consts = require("./consts");
+
+var _Message = _interopRequireDefault(require("./Message"));
+
+var _Pinger = _interopRequireDefault(require("./Pinger"));
+
+var _utils = require("./utils");
+
+/* eslint-disable */
+var Timeout = function Timeout(client, timeoutSeconds, action, args) {
+  if (!timeoutSeconds) timeoutSeconds = 30;
+
+  var doTimeout = function doTimeout(action, client, args) {
+    return function () {
+      return action.apply(client, args);
+    };
+  };
+
+  this.timeout = setTimeout(doTimeout(action, client, args), timeoutSeconds * 1000);
+
+  this.cancel = function () {
+    clearTimeout(this.timeout);
+  };
+};
+/* eslint-disable */
+
+
+var ClientImplementationementation = function ClientImplementationementation(uri, host, port, path, clientId) {
+  // Check dependencies are satisfied in this browser.
+  if (!('WebSocket' in global && global.WebSocket !== null)) {
+    throw new Error((0, _utils.format)(_consts.ERROR.UNSUPPORTED, ['WebSocket']));
+  }
+
+  if (!('ArrayBuffer' in global && global.ArrayBuffer !== null)) {
+    throw new Error((0, _utils.format)(_consts.ERROR.UNSUPPORTED, ['ArrayBuffer']));
+  }
+
+  this._trace('Paho.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.
+
+
+ClientImplementation.prototype.host = null;
+ClientImplementation.prototype.port = null;
+ClientImplementation.prototype.path = null;
+ClientImplementation.prototype.uri = null;
+ClientImplementation.prototype.clientId = null; // Messaging Client private instance members.
+
+ClientImplementation.prototype.socket = null;
+/* true once we have received an acknowledgement to a CONNECT packet. */
+
+ClientImplementation.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.
+ */
+
+ClientImplementation.prototype.maxMessageIdentifier = 65536;
+ClientImplementation.prototype.connectOptions = null;
+ClientImplementation.prototype.hostIndex = null;
+ClientImplementation.prototype.onConnected = null;
+ClientImplementation.prototype.onConnectionLost = null;
+ClientImplementation.prototype.onMessageDelivered = null;
+ClientImplementation.prototype.onMessageArrived = null;
+ClientImplementation.prototype.traceFunction = null;
+ClientImplementation.prototype._msg_queue = null;
+ClientImplementation.prototype._buffered_msg_queue = null;
+ClientImplementation.prototype._connectTimeout = null;
+/* The sendPinger monitors how long we allow before we send data to prove to the server that we are alive. */
+
+ClientImplementation.prototype.sendPinger = null;
+/* The receivePinger monitors how long we allow before we require evidence that the server is alive. */
+
+ClientImplementation.prototype.receivePinger = null;
+ClientImplementation.prototype._reconnectInterval = 1; // Reconnect Delay, starts at 1 second
+
+ClientImplementation.prototype._reconnecting = false;
+ClientImplementation.prototype._reconnectTimeout = null;
+ClientImplementation.prototype.disconnectedPublishing = false;
+ClientImplementation.prototype.disconnectedBufferSize = 5000;
+ClientImplementation.prototype.receiveBuffer = null;
+ClientImplementation.prototype._traceBuffer = null;
+ClientImplementation.prototype._MAX_TRACE_ENTRIES = 100;
+
+ClientImplementation.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((0, _utils.format)(_consts.ERROR.INVALID_STATE, ['already connected']));
+  if (this.socket) throw new Error((0, _utils.format)(_consts.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);
+  }
+};
+
+ClientImplementation.prototype.subscribe = function (filter, subscribeOptions) {
+  this._trace('Client.subscribe', filter, subscribeOptions);
+
+  if (!this.connected) throw new Error((0, _utils.format)(_consts.ERROR.INVALID_STATE, ['not connected']));
+  var wireMessage = new WireMessage(_consts.MESSAGE_TYPE.SUBSCRIBE);
+  wireMessage.topics = filter.constructor === Array ? filter : [filter];
+  if (subscribeOptions.qos === undefined) subscribeOptions.qos = 0;
+  wireMessage.requestedQos = [];
+
+  for (var i = 0; i < wireMessage.topics.length; i++) {
+    wireMessage.requestedQos[i] = subscribeOptions.qos;
+  }
+
+  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: (0, _utils.format)(errorCode)
+      });
+    };
+  }
+
+  if (subscribeOptions.timeout) {
+    wireMessage.timeOut = new Timeout(this, subscribeOptions.timeout, subscribeOptions.onFailure, [{
+      invocationContext: subscribeOptions.invocationContext,
+      errorCode: _consts.ERROR.SUBSCRIBE_TIMEOUT.code,
+      errorMessage: (0, _utils.format)(_consts.ERROR.SUBSCRIBE_TIMEOUT)
+    }]);
+  } // All subscriptions return a SUBACK.
+
+
+  this._requires_ack(wireMessage);
+
+  this._schedule_message(wireMessage);
+};
+/** @ignore */
+
+
+ClientImplementation.prototype.unsubscribe = function (filter, unsubscribeOptions) {
+  this._trace('Client.unsubscribe', filter, unsubscribeOptions);
+
+  if (!this.connected) throw new Error((0, _utils.format)(_consts.ERROR.INVALID_STATE, ['not connected']));
+  var wireMessage = new WireMessage(_consts.MESSAGE_TYPE.UNSUBSCRIBE);
+  wireMessage.topics = filter.constructor === Array ? filter : [filter];
+
+  if (unsubscribeOptions.onSuccess) {
+    wireMessage.callback = function () {
+      unsubscribeOptions.onSuccess({
+        invocationContext: unsubscribeOptions.invocationContext
+      });
+    };
+  }
+
+  if (unsubscribeOptions.timeout) {
+    wireMessage.timeOut = new Timeout(this, unsubscribeOptions.timeout, unsubscribeOptions.onFailure, [{
+      invocationContext: unsubscribeOptions.invocationContext,
+      errorCode: _consts.ERROR.UNSUBSCRIBE_TIMEOUT.code,
+      errorMessage: (0, _utils.format)(_consts.ERROR.UNSUBSCRIBE_TIMEOUT)
+    }]);
+  } // All unsubscribes return a SUBACK.
+
+
+  this._requires_ack(wireMessage);
+
+  this._schedule_message(wireMessage);
+};
+
+ClientImplementation.prototype.send = function (message) {
+  this._trace('Client.send', message);
+
+  var wireMessage = new WireMessage(_consts.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((0, _utils.format)(_consts.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; // Add messages in fifo order to array, by adding to start
+
+          this._buffered_msg_queue.unshift(wireMessage);
+        }
+      }
+    } else {
+      throw new Error((0, _utils.format)(_consts.ERROR.INVALID_STATE, ['not connected']));
+    }
+  }
+};
+
+ClientImplementation.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((0, _utils.format)(_consts.ERROR.INVALID_STATE, ['not connecting or connected']));
+  var wireMessage = new WireMessage(_consts.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);
+};
+
+ClientImplementation.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;
+  }
+};
+
+ClientImplementation.prototype.startTrace = function () {
+  if (this._traceBuffer === null) {
+    this._traceBuffer = [];
+  }
+
+  this._trace('Client.startTrace', new Date(), version);
+};
+
+ClientImplementation.prototype.stopTrace = function () {
+  delete this._traceBuffer;
+};
+
+ClientImplementation.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.default(this, this.connectOptions.keepAliveInterval);
+  this.receivePinger = new _Pinger.default(this, this.connectOptions.keepAliveInterval);
+
+  if (this._connectTimeout) {
+    this._connectTimeout.cancel();
+
+    this._connectTimeout = null;
+  }
+
+  this._connectTimeout = new Timeout(this, this.connectOptions.timeout, this._disconnected, [_consts.ERROR.CONNECT_TIMEOUT.code, (0, _utils.format)(_consts.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.
+
+
+ClientImplementation.prototype._schedule_message = function (message) {
+  // Add messages in fifo order to array, by adding to start
+  this._msg_queue.unshift(message); // Process outstanding messages in the queue if we have an  open socket, and have received CONNACK.
+
+
+  if (this.connected) {
+    this._process_queue();
+  }
+};
+
+ClientImplementation.prototype.store = function (prefix, wireMessage) {
+  var storedMessage = {
+    type: wireMessage.type,
+    messageIdentifier: wireMessage.messageIdentifier,
+    version: 1
+  };
+
+  switch (wireMessage.type) {
+    case _consts.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((0, _utils.format)(_consts.ERROR.INVALID_STORED_DATA, [prefix + this._localKey + wireMessage.messageIdentifier, storedMessage]));
+  }
+
+  localStorage.setItem(prefix + this._localKey + wireMessage.messageIdentifier, JSON.stringify(storedMessage));
+};
+
+ClientImplementation.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 _consts.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.default(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((0, _utils.format)(_consts.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;
+  }
+};
+
+ClientImplementation.prototype._process_queue = function () {
+  var message = null; // Send all queued messages down socket connection
+
+  while (message = this._msg_queue.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
+ */
+
+
+ClientImplementation.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 === _consts.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
+ */
+
+
+ClientImplementation.prototype._on_socket_open = function () {
+  // Create the CONNECT message object.
+  var wireMessage = new WireMessage(_consts.MESSAGE_TYPE.CONNECT, this.connectOptions);
+  wireMessage.clientId = this.clientId;
+
+  this._socket_send(wireMessage);
+};
+/**
+ * Called when the underlying websocket has received a complete packet.
+ * @ignore
+ */
+
+
+ClientImplementation.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]);
+  }
+};
+
+ClientImplementation.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 = (0, _utils.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(_consts.ERROR.INTERNAL_ERROR.code, (0, _utils.format)(_consts.ERROR.INTERNAL_ERROR, [error.message, errorStack]));
+
+    return;
+  }
+
+  return messages;
+};
+
+ClientImplementation.prototype._handleMessage = function (wireMessage) {
+  this._trace('Client._handleMessage', wireMessage);
+
+  try {
+    switch (wireMessage.type) {
+      case _consts.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(_consts.ERROR.CONNACK_RETURNCODE.code, (0, _utils.format)(_consts.ERROR.CONNACK_RETURNCODE, [wireMessage.returnCode, _consts.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;
+
+          while (msg = this._buffered_msg_queue.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 == _consts.MESSAGE_TYPE.PUBLISH && sentMessage.pubRecReceived) {
+            var pubRelMessage = new WireMessage(_consts.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 _consts.MESSAGE_TYPE.PUBLISH:
+        this._receivePublish(wireMessage);
+
+        break;
+
+      case _consts.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 _consts.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(_consts.MESSAGE_TYPE.PUBREL, {
+            messageIdentifier: wireMessage.messageIdentifier
+          });
+          this.store('Sent:', sentMessage);
+
+          this._schedule_message(pubRelMessage);
+        }
+
+        break;
+
+      case _consts.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(_consts.MESSAGE_TYPE.PUBCOMP, {
+          messageIdentifier: wireMessage.messageIdentifier
+        });
+
+        this._schedule_message(pubCompMessage);
+
+        break;
+
+      case _consts.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 _consts.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 _consts.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 _consts.MESSAGE_TYPE.PINGRESP:
+        /* The sendPinger or receivePinger may have sent a ping, the receivePinger has already been reset. */
+        this.sendPinger.reset();
+        break;
+
+      case _consts.MESSAGE_TYPE.DISCONNECT:
+        // Clients do not expect to receive disconnect packets.
+        this._disconnected(_consts.ERROR.INVALID_MQTT_MESSAGE_TYPE.code, (0, _utils.format)(_consts.ERROR.INVALID_MQTT_MESSAGE_TYPE, [wireMessage.type]));
+
+        break;
+
+      default:
+        this._disconnected(_consts.ERROR.INVALID_MQTT_MESSAGE_TYPE.code, (0, _utils.format)(_consts.ERROR.INVALID_MQTT_MESSAGE_TYPE, [wireMessage.type]));
+
+    }
+  } catch (error) {
+    var errorStack = error.hasOwnProperty('stack') == 'undefined' ? error.stack.toString() : 'No Error Stack Available';
+
+    this._disconnected(_consts.ERROR.INTERNAL_ERROR.code, (0, _utils.format)(_consts.ERROR.INTERNAL_ERROR, [error.message, errorStack]));
+
+    return;
+  }
+};
+/** @ignore */
+
+
+ClientImplementation.prototype._on_socket_error = function (error) {
+  if (!this._reconnecting) {
+    this._disconnected(_consts.ERROR.SOCKET_ERROR.code, (0, _utils.format)(_consts.ERROR.SOCKET_ERROR, [error.data]));
+  }
+};
+/** @ignore */
+
+
+ClientImplementation.prototype._on_socket_close = function () {
+  if (!this._reconnecting) {
+    this._disconnected(_consts.ERROR.SOCKET_CLOSE.code, (0, _utils.format)(_consts.ERROR.SOCKET_CLOSE));
+  }
+};
+/** @ignore */
+
+
+ClientImplementation.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 */
+
+
+ClientImplementation.prototype._receivePublish = function (wireMessage) {
+  switch (wireMessage.payloadMessage.qos) {
+    case 'undefined':
+    case 0:
+      this._receiveMessage(wireMessage);
+
+      break;
+
+    case 1:
+      var pubAckMessage = new WireMessage(_consts.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(_consts.MESSAGE_TYPE.PUBREC, {
+        messageIdentifier: wireMessage.messageIdentifier
+      });
+
+      this._schedule_message(pubRecMessage);
+
+      break;
+
+    default:
+      throw Error('Invaild qos=' + wireMessage.payloadMessage.qos);
+  }
+};
+/** @ignore */
+
+
+ClientImplementation.prototype._receiveMessage = function (wireMessage) {
+  if (this.onMessageArrived) {
+    this.onMessageArrived(wireMessage.payloadMessage);
+  }
+};
+/**
+ * Client has connected.
+ * @param {reconnect} [boolean] indicate if this was a result of reconnect operation.
+ * @param {uri} [string] fully qualified WebSocket URI of the server.
+ */
+
+
+ClientImplementation.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.
+ */
+
+
+ClientImplementation.prototype._reconnect = function () {
+  this._trace('Client._reconnect');
+
+  if (!this.connected) {
+    this._reconnecting = true;
+    this.sendPinger.cancel();
+    this.receivePinger.cancel();
+    if (this._reconnectInterval < 128) 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 {errorCode} [number] the error number.
+ * @param {errorText} [string] the error text.
+ * @ignore
+ */
+
+
+ClientImplementation.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, 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 = _consts.ERROR.OK.code;
+      errorText = (0, _utils.format)(_consts.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 !== _consts.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 */
+
+
+ClientImplementation.prototype._trace = function () {
+  // Pass trace message back to client's callback function
+  if (this.traceFunction) {
+    var args = Array.prototype.slice.call(arguments);
+
+    for (var i in args) {
+      if (typeof args[i] !== 'undefined') args.splice(i, 1, JSON.stringify(args[i]));
+    }
+
+    var record = args.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 */
+
+
+ClientImplementation.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;
+};
+
+var _default = ClientImplementationementation;
+exports.default = _default;
\ No newline at end of file

lib/Message.js

+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));
+
+var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));
+
+var _consts = require("./consts");
+
+var _utils = require("./utils");
+
+/* eslint-disable */
+var Message = /*#__PURE__*/function () {
+  function Message(newPayload) {
+    (0, _classCallCheck2.default)(this, Message);
+    this.payload;
+    this._destinationName = '';
+    this._qos = 0;
+    this._retained = false;
+    this._duplicate = false;
+    this._stringPayload = null;
+
+    if (typeof newPayload === "string" || newPayload instanceof ArrayBuffer || ArrayBuffer.isView(newPayload) && !(newPayload instanceof DataView)) {
+      payload = newPayload;
+    } else {
+      throw (0, _utils.format)(_consts.ERROR.INVALID_ARGUMENT, [newPayload, "newPayload"]);
+    }
+  }
+
+  (0, _createClass2.default)(Message, [{
+    key: "payloadString",
+    get: function get() {
+      if (typeof this.payload === 'string') return this.payload;else return (0, _utils.parseUTF8)(this.payload, 0, this.payload.length);
+    }
+  }, {
+    key: "payloadBytes",
+    get: function get() {
+      var payload = this.payload;
+
+      if (typeof payload === 'string') {
+        var buffer = new ArrayBuffer((0, _utils.UTF8Length)(payload));
+        var byteStream = new Uint8Array(buffer);
+        (0, _utils.stringToUTF8)(payload, byteStream, 0);
+        return byteStream;
+      } else {
+        return payload;
+      }
+    }
+  }, {
+    key: "destinationName",
+    get: function get() {
+      return this._destinationName;
+    },
+    set: function set(newDestinationName) {
+      if (typeof newDestinationName === 'string') this._destinationName = newDestinationName;else throw new Error((0, _utils.format)(_consts.ERROR.INVALID_ARGUMENT, [newDestinationName, 'newDestinationName']));
+    }
+  }, {
+    key: "qos",
+    get: function get() {
+      return this._qos;
+    },
+    set: function set(newQos) {
+      if (newQos === 0 || newQos === 1 || newQos === 2) this._qos = newQos;else throw new Error('Invalid argument:' + newQos);
+    }
+  }, {
+    key: "retained",
+    get: function get() {
+      return this._retained;
+    },
+    set: function set(newRetained) {
+      if (typeof newRetained === 'boolean') this._retained = newRetained;else throw new Error((0, _utils.format)(_consts.ERROR.INVALID_ARGUMENT, [newRetained, 'newRetained']));
+    }
+  }, {
+    key: "topic",
+    get: function get() {
+      return this.destinationName;
+    },
+    set: function set(newTopic) {
+      this.destinationName = newTopic;
+    }
+  }, {
+    key: "duplicate",
+    get: function get() {
+      return this._duplicate;
+    },
+    set: function set(newDuplicate) {
+      this._duplicate = newDuplicate;
+    }
+  }, {
+    key: "stringPayload",
+    get: function get() {
+      return this._stringPayload;
+    },
+    set: function set(newStringPayload) {
+      this._stringPayload = newStringPayload;
+    }
+  }]);
+  return Message;
+}();
+
+var _default = Message;
+exports.default = _default;
\ No newline at end of file

lib/Pinger.js

+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _consts = require("./consts");
+
+var _utils = require("./utils");
+
+var _WireMessage = _interopRequireDefault(require("./WireMessage"));
+
+/* eslint-disable */
+var Pinger = function Pinger(client, keepAliveInterval) {
+  this._client = client;
+  this._keepAliveInterval = keepAliveInterval * 1000;
+  this.isReset = false;
+  var pingReq = new _WireMessage.default(_consts.MESSAGE_TYPE.PINGREQ).encode();
+
+  var doTimeout = function doTimeout(pinger) {
+    return function () {
+      return doPing.apply(pinger);
+    };
+  };
+  /** @ignore */
+
+
+  var doPing = function doPing() {
+    if (!this.isReset) {
+      this._client._trace("Pinger.doPing", "Timed out");
+
+      this._client._disconnected(_consts.ERROR.PING_TIMEOUT.code, (0, _utils.format)(_consts.ERROR.PING_TIMEOUT));
+    } else {
+      this.isReset = false;
+
+      this._client._trace("Pinger.doPing", "send PINGREQ");
+
+      this._client.socket.send(pingReq);
+
+      this.timeout = setTimeout(doTimeout(this), this._keepAliveInterval);
+    }
+  };
+
+  this.reset = function () {
+    this.isReset = true;
+    clearTimeout(this.timeout);
+    if (this._keepAliveInterval > 0) this.timeout = setTimeout(doTimeout(this), this._keepAliveInterval);
+  };
+
+  this.cancel = function () {
+    clearTimeout(this.timeout);
+  };
+};
+
+var _default = Pinger;
+exports.default = _default;
\ No newline at end of file

lib/WireMessage.js

+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));
+
+var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));
+
+var _consts = require("./consts");
+
+var _utils = require("./utils");
+
+/* eslint-disable */
+// interface WireMessageOptions {
+//     messageIdentifier?: number
+//     mqttVersion?: 3 | 4
+//     clientId?: string
+//     willMessage?: MqttMessage
+//     userName?: string
+//     password?: string
+//     topics?: string[]
+//     requestedQos?: (0 | 1 | 2)[]
+//     payloadMessage?: MqttMessage
+//     cleanSession?: boolean
+//     keepAliveInterval?: number
+//     [key: string]: any
+//   }
+var WireMessage = /*#__PURE__*/function () {
+  function WireMessage(type, options) {
+    (0, _classCallCheck2.default)(this, WireMessage);
+    this.type = type;
+
+    for (var name in options) {
+      if (options.hasOwnProperty(name)) {
+        this[name] = options[name];
+      }
+    }
+  }
+
+  (0, _createClass2.default)(WireMessage, [{
+    key: "encode",
+    value: function encode() {
+      // 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 _consts.MESSAGE_TYPE.CONNECT:
+          switch (this.mqttVersion) {
+            case 3:
+              remLength += _consts.MqttProtoIdentifierv3.length + 3;
+              break;
+
+            case 4:
+              remLength += _consts.MqttProtoIdentifierv4.length + 3;
+              break;
+          }
+
+          remLength += (0, _utils.UTF8Length)(this.clientId) + 2;
+
+          if (this.willMessage !== undefined) {
+            remLength += (0, _utils.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 += (0, _utils.UTF8Length)(this.userName) + 2;
+          if (this.password !== undefined) remLength += (0, _utils.UTF8Length)(this.password) + 2;
+          break;
+        // Subscribe, Unsubscribe can both contain topic strings
+
+        case _consts.MESSAGE_TYPE.SUBSCRIBE:
+          first |= 0x02; // Qos = 1;
+
+          for (var i = 0; i < this.topics.length; i++) {
+            topicStrLength[i] = (0, _utils.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 _consts.MESSAGE_TYPE.UNSUBSCRIBE:
+          first |= 0x02; // Qos = 1;
+
+          for (var i = 0; i < this.topics.length; i++) {
+            topicStrLength[i] = (0, _utils.UTF8Length)(this.topics[i]);
+            remLength += topicStrLength[i] + 2;
+          }
+
+          break;
+
+        case _consts.MESSAGE_TYPE.PUBREL:
+          first |= 0x02; // Qos = 1;
+
+          break;
+
+        case _consts.MESSAGE_TYPE.PUBLISH:
+          if (this.payloadMessage.duplicate) first |= 0x08;
+          first = first |= this.payloadMessage.qos << 1;
+          if (this.payloadMessage.retained) first |= 0x01;
+          destinationNameLength = (0, _utils.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 _consts.MESSAGE_TYPE.DISCONNECT:
+          break;
+
+        default:
+          break;
+      } // Now we can allocate a buffer for the message
+
+
+      var mbi = (0, _utils.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 == _consts.MESSAGE_TYPE.PUBLISH) pos = (0, _utils.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 == _consts.MESSAGE_TYPE.CONNECT) {
+          switch (this.mqttVersion) {
+            case 3:
+              byteStream.set(_consts.MqttProtoIdentifierv3, pos);
+              pos += _consts.MqttProtoIdentifierv3.length;
+              break;
+
+            case 4:
+              byteStream.set(_consts.MqttProtoIdentifierv4, pos);
+              pos += _consts.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 = (0, _utils.writeUint16)(this.keepAliveInterval, byteStream, pos);
+        } // Output the messageIdentifier - if there is one
+
+      if (this.messageIdentifier !== undefined) pos = (0, _utils.writeUint16)(this.messageIdentifier, byteStream, pos);
+
+      switch (this.type) {
+        case _consts.MESSAGE_TYPE.CONNECT:
+          pos = (0, _utils.writeString)(this.clientId, (0, _utils.UTF8Length)(this.clientId), byteStream, pos);
+
+          if (this.willMessage !== undefined) {
+            pos = (0, _utils.writeString)(this.willMessage.destinationName, (0, _utils.UTF8Length)(this.willMessage.destinationName), byteStream, pos);
+            pos = (0, _utils.writeUint16)(willMessagePayloadBytes.byteLength, byteStream, pos);
+            byteStream.set(willMessagePayloadBytes, pos);
+            pos += willMessagePayloadBytes.byteLength;
+          }
+
+          if (this.userName !== undefined) pos = (0, _utils.writeString)(this.userName, (0, _utils.UTF8Length)(this.userName), byteStream, pos);
+          if (this.password !== undefined) pos = (0, _utils.writeString)(this.password, (0, _utils.UTF8Length)(this.password), byteStream, pos);
+          break;
+
+        case _consts.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 _consts.MESSAGE_TYPE.SUBSCRIBE:
+          // SUBSCRIBE has a list of topic strings and request QoS
+          for (var i = 0; i < this.topics.length; i++) {
+            pos = (0, _utils.writeString)(this.topics[i], topicStrLength[i], byteStream, pos);
+            byteStream[pos++] = this.requestedQos[i];
+          }
+
+          break;
+
+        case _consts.MESSAGE_TYPE.UNSUBSCRIBE:
+          // UNSUBSCRIBE has a list of topic strings
+          for (var i = 0; i < this.topics.length; i++) {
+            pos = (0, _utils.writeString)(this.topics[i], topicStrLength[i], byteStream, pos);
+          }
+
+          break;
+
+        default: // Do nothing.
+
+      }
+
+      return buffer;
+    }
+  }]);
+  return WireMessage;
+}();
+
+var _default = WireMessage;
+exports.default = _default;
\ No newline at end of file

lib/consts.js

+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.MqttProtoIdentifierv4 = exports.MqttProtoIdentifierv3 = exports.CONNACK_RC = exports.ERROR = exports.MESSAGE_TYPE = void 0;
+
+/* eslint-disable */
+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
+};
+/**
+ * Unique message type identifiers, with associated
+ * associated integer values.
+ * @private
+ */
+
+exports.MESSAGE_TYPE = MESSAGE_TYPE;
+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. */
+
+exports.ERROR = ERROR;
+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"
+}; //MQTT protocol and version          6    M    Q    I    s    d    p    3
+
+exports.CONNACK_RC = CONNACK_RC;
+var MqttProtoIdentifierv3 = [0x00, 0x06, 0x4d, 0x51, 0x49, 0x73, 0x64, 0x70, 0x03]; //MQTT proto/version for 311         4    M    Q    T    T    4
+
+exports.MqttProtoIdentifierv3 = MqttProtoIdentifierv3;
+var MqttProtoIdentifierv4 = [0x00, 0x04, 0x4d, 0x51, 0x54, 0x54, 0x04];
+exports.MqttProtoIdentifierv4 = MqttProtoIdentifierv4;
\ No newline at end of file

lib/index.js

+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _Client = _interopRequireDefault(require("./Client"));
+
+var _Message = _interopRequireDefault(require("./Message"));
+
+/* eslint-disable */
+var MqttClient = {
+  Client: _Client.default,
+  Message: _Message.default
+};
+var _default = MqttClient;
+exports.default = _default;
\ No newline at end of file

lib/utils.js

+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.decodeMessage = decodeMessage;
+exports.writeUint16 = writeUint16;
+exports.writeString = writeString;
+exports.readUint16 = readUint16;
+exports.encodeMBI = encodeMBI;
+exports.UTF8Length = UTF8Length;
+exports.stringToUTF8 = stringToUTF8;
+exports.parseUTF8 = parseUTF8;
+exports.format = exports.validate = void 0;
+
+var _typeof2 = _interopRequireDefault(require("@babel/runtime/helpers/typeof"));
+
+var _consts = require("./consts");
+
+var _Message = _interopRequireDefault(require("./Message"));
+
+/* eslint-disable */
+
+/**
+	 * 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 {Object} obj - User options object
+	 * @param {Object} keys - valid keys and types that may exist in obj.
+	 * @throws {Error} Invalid option parameter found.
+	 * @private
+	 */
+var validate = function validate(obj, keys) {
+  for (var key in obj) {
+    if (obj.hasOwnProperty(key)) {
+      if (keys.hasOwnProperty(key)) {
+        if ((0, _typeof2.default)(obj[key]) !== keys[key]) throw new Error(format(_consts.ERROR.INVALID_TYPE, [(0, _typeof2.default)(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);
+      }
+    }
+  }
+};
+/**
+* Format an error message text.
+* @private
+* @param {error} ERROR value above.
+* @param {substitutions} [array] substituted into the text.
+* @return the text with the substitutions made.
+*/
+
+
+exports.validate = validate;
+
+var format = function format(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;
+};
+
+exports.format = format;
+
+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 _consts.MESSAGE_TYPE.CONNACK:
+      var connectAcknowledgeFlags = input[pos++];
+      if (connectAcknowledgeFlags & 0x01) wireMessage.sessionPresent = true;
+      wireMessage.returnCode = input[pos++];
+      break;
+
+    case _consts.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.default(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 _consts.MESSAGE_TYPE.PUBACK:
+    case _consts.MESSAGE_TYPE.PUBREC:
+    case _consts.MESSAGE_TYPE.PUBREL:
+    case _consts.MESSAGE_TYPE.PUBCOMP:
+    case _consts.MESSAGE_TYPE.UNSUBACK:
+      wireMessage.messageIdentifier = readUint16(input, pos);
+      break;
+
+    case _consts.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
+*/
+
+
+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
+*/
+
+
+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
+*/
+
+
+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(_consts.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(_consts.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(_consts.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(_consts.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(_consts.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;
+}
\ No newline at end of file

package.json

@@ -15,9 +15,7 @@
     "prettier": "prettier -c --write **/*"
   },
   "dependencies": {
-    "@babel/runtime": "^7.10.5",
-    "js-base64": "^3.5.2",
-    "kit_utils": "^1.3.6"
+    "@babel/runtime": "^7.10.5"
   },
   "devDependencies": {
     "@umijs/fabric": "^2.0.7",