File: source/template/header.js

(function(globals) {
 
'use strict';
 
/* jshint ignore:start */
// Object.keys() polyfill - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys
!function(){Object.keys||(Object.keys=function(){var t=Object.prototype.hasOwnProperty,r=!{toString:null}.propertyIsEnumerable("toString"),e=["toString","toLocaleString","valueOf","hasOwnProperty","isPrototypeOf","propertyIsEnumerable","constructor"],o=e.length;return function(n){if("object"!=typeof n&&"function"!=typeof n||null===n)throw new TypeError("Object.keys called on non-object");var c=[];for(var l in n)t.call(n,l)&&c.push(l);if(r)for(var p=0;o>p;p++)t.call(n,e[p])&&c.push(e[p]);return c}}())}();
// Date.getISOString() polyfill - https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString
!function(){function t(t){return 10>t?"0"+t:t}Date.prototype.toISOString=function(){return this.getUTCFullYear()+"-"+t(this.getUTCMonth()+1)+"-"+t(this.getUTCDate())+"T"+t(this.getUTCHours())+":"+t(this.getUTCMinutes())+":"+t(this.getUTCSeconds())+"."+(this.getUTCMilliseconds()/1e3).toFixed(3).slice(2,5)+"Z"}}();
// Date.now() polyfill
!function(){"function"!=typeof Date.now&&(Date.now=function(){return(new Date).getTime()})}();
// addEventListener() polyfill - https://gist.github.com/eirikbacker/2864711
!function(e,t){function n(e){var n=t[e];t[e]=function(e){return o(n(e))}}function a(t,n,a){return(a=this).attachEvent("on"+t,function(t){var t=t||e.event;t.preventDefault=t.preventDefault||function(){t.returnValue=!1},t.stopPropagation=t.stopPropagation||function(){t.cancelBubble=!0},n.call(a,t)})}function o(e,t){if(t=e.length)for(;t--;)e[t].addEventListener=a;else e.addEventListener=a;return e}e.addEventListener||(o([t,e]),"Element"in e?e.Element.prototype.addEventListener=a:(t.attachEvent("onreadystatechange",function(){o(t.all)}),n("getElementsByTagName"),n("getElementById"),n("createElement"),o(t.all)))}(window,document);
// performance.now() polyfill - https://gist.github.com/paulirish/5438650
!function(){if("performance"in window==0&&(window.performance={}),Date.now=Date.now||function(){return(new Date).getTime()},"now"in window.performance==0){var a=Date.now();performance.timing&&performance.timing.navigationStart&&(a=performance.timing.navigationStart),window.performance.now=function(){return Date.now()-a}}}();
// BlobBuilder polyfill
window.BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder || window.MSBlobBuilder;
// Array.prototype.forEach polyfill - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach
if(!Array.prototype.forEach){Array.prototype.forEach=function(callback){var T,k;if(this==null){throw new TypeError('this is null or not defined');} var O=Object(this);var len=O.length>>>0;if(typeof callback!=='function'){throw new TypeError(callback+' is not a function');} if(arguments.length>1){T=arguments[1];} k=0;while(k<len){var kValue;if(k in O){kValue=O[k];callback.call(T,kValue,k,O);} k++;}};}
/* jshint ignore:end */
 
/**
 * Global function that clones an object.
 */
var clone = function (obj) {
  if (obj === null || typeof obj !== 'object') {
    return obj;
  }
 
  var copy = function (data) {
    var copy = data.constructor();
    for (var attr in data) {
      if (data.hasOwnProperty(attr)) {
        copy[attr] = data[attr];
      }
    }
    return copy;
  };
 
  if (typeof obj === 'object' && !Array.isArray(obj)) {
    try {
      return JSON.parse( JSON.stringify(obj) );
    } catch (err) {
      return copy(obj);
    }
  }
 
  return copy(obj);
};
 
/**
 * <h2>Prerequisites on using Skylink</h2>
 * Before using any Skylink functionalities, you will need to authenticate your App Key using
 *   the <a href="#method_init">`init()` method</a>.
 *
 * To manage or create App Keys, you may access the [Temasys Console here](https://console.temasys.io).
 *
 * To view the list of supported browsers, visit [the list here](
 * https://github.com/Temasys/SkylinkJS#supported-browsers).
 *
 * Here are some articles to help you get started:
 * - [How to setup a simple video call](https://temasys.io/temasys-rtc-getting-started-web-sdk/)
 * - [How to setup screensharing](https://temasys.io/webrtc-screensharing-temasys-web-sdk/)
 * - [How to create a chatroom like feature](https://temasys.io/building-a-simple-peer-to-peer-webrtc-chat/)
 *
 * Here are some demos you may use to aid your development:
 * - Getaroom.io [[Demo](https://getaroom.io) / [Source code](https://github.com/Temasys/getaroom)]
 * - Creating a component [[Link](https://github.com/Temasys/skylink-call-button)]
 *
 * You may see the example below in the <a href="#">Constructor tab</a> to have a general idea how event subscription
 *   and the ordering of <a href="#method_init"><code>init()</code></a> and
 *   <a href="#method_joinRoom"><code>joinRoom()</code></a> methods should be called.
 *
 * If you have any issues, you may find answers to your questions in the FAQ section on [our support portal](
 * http://support.temasys.io), asks questions, request features or raise bug tickets as well.
 *
 * If you would like to contribute to our Temasys Web SDK codebase, see [the contributing README](
 * https://github.com/Temasys/SkylinkJS/blob/master/CONTRIBUTING.md).
 *
 * [See License (Apache 2.0)](https://github.com/Temasys/SkylinkJS/blob/master/LICENSE)
 *
 * @class Skylink
 * @constructor
 * @example
 *   // Here's a simple example on how you can start using Skylink.
 *   var skylinkDemo = new Skylink();
 *
 *   // Subscribe all events first as a general guideline
 *   skylinkDemo.on("incomingStream", function (peerId, stream, peerInfo, isSelf) {
 *     if (isSelf) {
 *       attachMediaStream(document.getElementById("selfVideo"), stream);
 *     } else {
 *       var peerVideo = document.createElement("video");
 *       peerVideo.id = peerId;
 *       peerVideo.autoplay = "autoplay";
 *       document.getElementById("peersVideo").appendChild(peerVideo);
 *       attachMediaStream(peerVideo, stream);
 *     }
 *   });
 *
 *   skylinkDemo.on("peerLeft", function (peerId, peerInfo, isSelf) {
 *     if (!isSelf) {
 *       var peerVideo = document.getElementById(peerId);
 *       // do a check if peerVideo exists first
 *       if (peerVideo) {
 *         document.getElementById("peersVideo").removeChild(peerVideo);
 *       } else {
 *         console.error("Peer video for " + peerId + " is not found.");
 *       }
 *     }
 *   });
 *
 *  // init() should always be called first before other methods other than event methods like on() or off().
 *  skylinkDemo.init("YOUR_APP_KEY_HERE", function (error, success) {
 *    if (success) {
 *      skylinkDemo.joinRoom("my_room", {
 *        userData: "My Username",
 *        audio: true,
 *        video: true
 *      });
 *    }
 *  });
 * @for Skylink
 * @since 0.5.0
 */
function Skylink() {
  /**
   * Stores the list of Peer Datachannel connections.
   * @attribute _dataChannels
   * @param {JSON} #peerId The list of Datachannels associated with Peer ID.
   * @param {RTCDataChannel} #peerId.#channelLabel The Datachannel connection.
   *   The property name <code>"main"</code> is reserved for messaging Datachannel type.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.2.0
   */
  this._dataChannels = {};
 
  /**
   * Stores the list of data transfers from / to Peers.
   * @attribute _dataTransfers
   * @param {JSON} #transferId The data transfer session.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.16
   */
  this._dataTransfers = {};
 
  /**
   * Stores the list of sending data streaming sessions to Peers.
   * @attribute _dataStreams
   * @param {JSON} #streamId The data stream session.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.18
   */
  this._dataStreams = {};
 
  /**
   * Stores the list of buffered ICE candidates that is received before
   *   remote session description is received and set.
   * @attribute _peerCandidatesQueue
   * @param {Array} <#peerId> The list of the Peer connection buffered ICE candidates received.
   * @param {RTCIceCandidate} <#peerId>.<#index> The Peer connection buffered ICE candidate received.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.5.1
   */
  this._peerCandidatesQueue = {};
 
  /**
   * Stores the list of ICE candidates received before signaling end.
   * @attribute _peerEndOfCandidatesCounter
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.16
   */
  this._peerEndOfCandidatesCounter = {};
 
  /**
   * Stores the list of Peer connection ICE candidates.
   * @attribute _gatheredCandidates
   * @param {JSON} <#peerId> The list of the Peer connection ICE candidates.
   * @param {JSON} <#peerId>.sending The list of the Peer connection ICE candidates sent.
   * @param {JSON} <#peerId>.receiving The list of the Peer connection ICE candidates received.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.14
   */
  this._gatheredCandidates = {};
 
  /**
   * Stores the global number of Peer connection retries that would increase the wait-for-response timeout
   *   for the Peer connection health timer.
   * @attribute _retryCounters
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.5.10
   */
  this._retryCounters = {};
 
  /**
   * Stores the list of the Peer connections.
   * @attribute _peerConnections
   * @param {RTCPeerConnection} <#peerId> The Peer connection.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.1.0
   */
  this._peerConnections = {};
 
  /**
   * Stores the list of the Peer connections stats.
   * @attribute _peerStats
   * @param {JSON} <#peerId> The Peer connection stats.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.16
   */
  this._peerStats = {};
 
  /**
   * Stores the list of the Peer connections stats.
   * @attribute _peerBandwidth
   * @param {JSON} <#peerId> The Peer connection stats.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.16
   */
  this._peerBandwidth = {};
 
  /**
   * Stores the list of the Peer custom configs.
   * @attribute _peerCustomConfigs
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.18
   */
  this._peerCustomConfigs = {};
 
  /**
   * Stores the list of Peers session information.
   * @attribute _peerInformations
   * @param {JSON} <#peerId> The Peer session information.
   * @param {JSON|String} <#peerId>.userData The Peer custom data.
   * @param {JSON} <#peerId>.settings The Peer streaming information.
   * @param {JSON} <#peerId>.mediaStatus The Peer streaming muted status.
   * @param {JSON} <#peerId>.agent The Peer agent information.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.3.0
   */
  this._peerInformations = {};
 
  /**
   * Stores the Signaling user credentials from the API response required for connecting to the Signaling server.
   * @attribute _user
   * @param {String} uid The API result "username".
   * @param {String} token The API result "userCred".
   * @param {String} timeStamp The API result "timeStamp".
   * @param {String} sid The Signaling server receive user Peer ID.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.5.6
   */
  this._user = null;
 
  /**
   * Stores the User custom data.
   * By default, if no custom user data is set, it is an empty string <code>""</code>.
   * @attribute _userData
   * @type JSON|String
   * @default ""
   * @private
   * @for Skylink
   * @since 0.5.6
   */
  this._userData = '';
 
  /**
   * Stores the User connection priority weight.
   * If Peer has a higher connection weight, it will do the offer from its Peer connection first.
   * @attribute _peerPriorityWeight
   * @type Number
   * @private
   * @for Skylink
   * @since 0.5.0
   */
  this._peerPriorityWeight = 0;
 
  /**
   * Stores the flag that indicates if "autoIntroduce" is enabled.
   * If enabled, the Peers connecting the same Room will receive each others "enter" message ping.
   * @attribute _autoIntroduce
   * @type Boolean
   * @default true
   * @private
   * @for Skylink
   * @since 0.6.1
   */
  this._autoIntroduce = true;
 
  /**
   * Stores the flag that indicates if "isPrivileged" is enabled.
   * If enabled, the User has Privileged features which has the ability to retrieve the list of
   *   Peers in the same App space with <code>getPeers()</code> method
   *   and introduce Peers to each other with <code>introducePeer</code> method.
   * @attribute isPrivileged
   * @type Boolean
   * @default false
   * @private
   * @for Skylink
   * @since 0.6.1
   */
  this._isPrivileged = false;
 
  /**
   * Stores the list of Peers retrieved from the Signaling from <code>getPeers()</code> method.
   * @attribute _peerList
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.1
   */
  this._peerList = null;
 
  /**
   * Stores the current Room name that User is connected to.
   * @attribute _selectedRoom
   * @type String
   * @private
   * @for Skylink
   * @since 0.3.0
   */
  this._selectedRoom = null;
 
  /**
   * Stores the flag that indicates if Room is locked.
   * @attribute _roomLocked
   * @type Boolean
   * @private
   * @for Skylink
   * @since 0.5.2
   */
  this._roomLocked = false;
 
  /**
   * Stores the flag that indicates if User is connected to the Room.
   * @attribute _inRoom
   * @type Boolean
   * @private
   * @for Skylink
   * @since 0.4.0
   */
  this._inRoom = false;
 
  /**
   * Stores the list of <code>on()</code> event handlers.
   * @attribute _EVENTS
   * @param {Array} <#event> The list of event handlers associated with the event.
   * @param {Function} <#event>.<#index> The event handler function.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.5.2
   */
  this._EVENTS = {};
 
  /**
   * Stores the list of <code>once()</code> event handlers.
   * These events are only triggered once.
   * @attribute _onceEvents
   * @param {Array} <#event> The list of event handlers associated with the event.
   * @param {Array} <#event>.<#index> The array of event handler function and its condition function.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.5.4
   */
  this._onceEvents = {};
 
  /**
   * Stores the timestamps data used for throttling.
   * @attribute _timestamp
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.5.8
   */
  this._timestamp = {
    socketMessage: null,
    shareScreen: null,
    refreshConnection: null,
    getUserMedia: null,
    lastRestart: null
  };
 
  /**
   * Stores the current socket connection information.
   * @attribute _socketSession
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.13
   */
  this._socketSession = {};
 
  /**
   * Stores the queued socket messages.
   * This is to prevent too many sent over less than a second interval that might cause dropped messages
   *   or jams to the Signaling connection.
   * @attribute _socketMessageQueue
   * @type Array
   * @private
   * @for Skylink
   * @since 0.5.8
   */
  this._socketMessageQueue = [];
 
  /**
   * Stores the <code>setTimeout</code> to sent queued socket messages.
   * @attribute _socketMessageTimeout
   * @type Object
   * @private
   * @for Skylink
   * @since 0.5.8
   */
  this._socketMessageTimeout = null;
 
  /**
   * Stores the list of socket ports to use to connect to the Signaling.
   * These ports are defined by default which is commonly used currently by the Signaling.
   * Should re-evaluate this sometime.
   * @attribute _socketPorts
   * @param {Array} http: The list of HTTP socket ports.
   * @param {Array} https: The list of HTTPS socket ports.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.5.8
   */
  this._socketPorts = {
    'http:': [80, 3000],
    'https:': [443, 3443]
  };
 
  /**
   * Stores the flag that indicates if socket connection to the Signaling has opened.
   * @attribute _channelOpen
   * @type Boolean
   * @private
   * @for Skylink
   * @since 0.5.2
   */
  this._channelOpen = false;
 
  /**
   * Stores the Signaling server url.
   * @attribute _signalingServer
   * @type String
   * @private
   * @for Skylink
   * @since 0.5.2
   */
  this._signalingServer = null;
 
  /**
   * Stores the Signaling server protocol.
   * @attribute _signalingServerProtocol
   * @type String
   * @private
   * @for Skylink
   * @since 0.5.4
   */
  this._signalingServerProtocol = window.location.protocol;
 
  /**
   * Stores the Signaling server port.
   * @attribute _signalingServerPort
   * @type Number
   * @private
   * @for Skylink
   * @since 0.5.4
   */
  this._signalingServerPort = null;
 
  /**
   * Stores the Signaling socket connection object.
   * @attribute _socket
   * @type io
   * @private
   * @for Skylink
   * @since 0.1.0
   */
  this._socket = null;
 
  /**
   * Stores the flag that indicates if XDomainRequest is used for IE 8/9.
   * @attribute _socketUseXDR
   * @type Boolean
   * @private
   * @for Skylink
   * @since 0.5.4
   */
  this._socketUseXDR = false;
 
  /**
   * Stores the value if ICE restart is supported.
   * @attribute _enableIceRestart
   * @type String
   * @private
   * @for Skylink
   * @since 0.6.16
   */
  this._enableIceRestart = false;
 
  /**
   * Stores the flag if MCU environment is enabled.
   * @attribute _hasMCU
   * @type Boolean
   * @private
   * @for Skylink
   * @since 0.5.4
   */
  this._hasMCU = false;
 
  /**
   * Stores the construct API REST path to obtain Room credentials.
   * @attribute _path
   * @type String
   * @private
   * @for Skylink
   * @since 0.1.0
   */
  this._path = null;
 
  /**
   * Stores the current <code>init()</code> readyState.
   * @attribute _readyState
   * @type Number
   * @private
   * @for Skylink
   * @since 0.1.0
   */
  this._readyState = null;
 
  /**
   * Stores the "cid" used for <code>joinRoom()</code>.
   * @attribute _key
   * @type String
   * @private
   * @for Skylink
   * @since 0.1.0
   */
  this._key = null;
 
  /**
   * Stores the "apiOwner" used for <code>joinRoom()</code>.
   * @attribute _appKeyOwner
   * @type String
   * @private
   * @for Skylink
   * @since 0.5.2
   */
  this._appKeyOwner = null;
 
  /**
   * Stores the Room credentials information for <code>joinRoom()</code>.
   * @attribute _room
   * @param {String} id The "rid" for <code>joinRoom()</code>.
   * @param {String} token The "roomCred" for <code>joinRoom()</code>.
   * @param {String} startDateTime The "start" for <code>joinRoom()</code>.
   * @param {String} duration The "len" for <code>joinRoom()</code>.
   * @param {String} connection The RTCPeerConnection constraints and configuration. This is not used in the SDK
   *   except for the "mediaConstraints" property that sets the default <code>getUserMedia()</code> settings.
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.5.2
   */
  this._room = null;
 
  /**
   * Stores the list of Peer messages timestamp.
   * @attribute _peerMessagesStamps
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.15
   */
  this._peerMessagesStamps = {};
 
  /**
   * Stores the Streams.
   * @attribute _streams
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.15
   */
  this._streams = {
    userMedia: null,
    screenshare: null
  };
 
  /**
   * Stores the default camera Stream settings.
   * @attribute _streamsDefaultSettings
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.15
   */
  this._streamsDefaultSettings = {
    userMedia: {
      audio: {
        stereo: false
      },
      video: {
        resolution: {
          width: 640,
          height: 480
        },
        frameRate: 50
      }
    },
    screenshare: {
      video: true
    }
  };
 
  /**
   * Stores all the Stream required muted settings.
   * @attribute _streamsMutedSettings
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.15
   */
  this._streamsMutedSettings = {
    audioMuted: false,
    videoMuted: false
  };
 
  /**
   * Stores all the Stream sending maximum bandwidth settings.
   * @attribute _streamsBandwidthSettings
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.15
   */
  this._streamsBandwidthSettings = {
    googleX: {},
    bAS: {}
  };
 
  /**
   * Stores all the Stream stopped callbacks.
   * @attribute _streamsStoppedCbs
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.15
   */
  this._streamsStoppedCbs = {};
 
  /**
   * Stores all the Stream sessions.
   * Defined as <code>false</code> when Stream has already ended.
   * @attribute _streamsSession
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.15
   */
  this._streamsSession = {};
 
  /**
   * Stores the session description settings.
   * @attribute _sdpSettings
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.16
   */
  this._sdpSettings = {
    connection: {
      audio: true,
      video: true,
      data: true
    },
    direction: {
      audio: { send: true, receive: true },
      video: { send: true, receive: true }
    }
  };
 
  /**
   * Stores the publish only settings.
   * @attribute _publishOnly
   * @type Boolean
   * @private
   * @for Skylink
   * @since 0.6.16
   */
  this._publishOnly = false;
 
  /**
   * Stores the parent ID.
   * @attribute _parentId
   * @type String
   * @private
   * @for Skylink
   * @since 0.6.18
   */
  this._parentId = null;
 
  /**
   * Stores the list of recordings.
   * @attribute _recordings
   * @type JSON
   * @private
   * @beta
   * @for Skylink
   * @since 0.6.16
   */
  this._recordings = {};
 
  /**
   * Stores the list of RTMP Sessions.
   * @attribute _rtmpSessions
   * @type JSON
   * @private
   * @beta
   * @for Skylink
   * @since 0.6.36
   */
  this._rtmpSessions = {};
 
  /**
   * Stores the current active recording session ID.
   * There can only be 1 recording session at a time in a Room
   * @attribute _currentRecordingId
   * @type JSON
   * @private
   * @beta
   * @for Skylink
   * @since 0.6.16
   */
  this._currentRecordingId = false;
 
  /**
   * Stores the recording session timeout to ensure 4 seconds has been recorded.
   * @attribute _recordingStartInterval
   * @type JSON
   * @private
   * @beta
   * @for Skylink
   * @since 0.6.16
   */
  this._recordingStartInterval = null;
 
  /**
   * Stores the currently supported codecs.
   * @attribute _currentCodecSupport
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.18
   */
  this._currentCodecSupport = null;
 
  /**
   * Stores the session description orders and info.
   * @attribute _sdpSessions
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.18
   */
  this._sdpSessions = {};
 
  /**
   * Stores the flag if voice activity detection should be enabled.
   * @attribute _voiceActivityDetection
   * @type Boolean
   * @default true
   * @private
   * @for Skylink
   * @since 0.6.18
   */
  this._voiceActivityDetection = true;
 
  /**
   * Stores the datachannel binary data chunk type.
   * @attribute _binaryChunkType
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.18
   */
  this._binaryChunkType = this.DATA_TRANSFER_DATA_TYPE.ARRAY_BUFFER;
 
  /**
   * Stores the RTCPeerConnection configuration.
   * @attribute _peerConnectionConfig
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.18
   */
  this._peerConnectionConfig = {};
 
  /**
   * Stores the auto bandwidth settings.
   * @attribute _bandwidthAdjuster
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.18
   */
  this._bandwidthAdjuster = null;
 
  /**
   * Stores the Peer connection status.
   * @attribute _peerConnStatus
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.19
   */
  this._peerConnStatus = {};
 
  /**
   * Stores the flag to temporarily halt joinRoom() from processing.
   * @attribute _joinRoomManager
   * @type Boolean
   * @private
   * @for Skylink
   * @since 0.6.19
   */
  this._joinRoomManager = {
    timestamp: 0,
    socketsFn: []
  };
 
  /**
   * Stores the `init()` configuration.
   * @attribute _initOptions
   * @type JSON
   * @private
   * @for Skylink
   * @since 0.6.27
   */
  this._initOptions = {};
 
  /**
   * Stores the unique random number used for generating the "client_id".
   * @attribute _statIdRandom
   * @type Number
   * @private
   * @for Skylink
   * @since 0.6.31
   */
  this._statIdRandom = Date.now() + Math.floor(Math.random() * 100000000);
 
  /**
   * A mapping of transceiverIds and peer IDs (only when new MCU is in effect)
   * @attribute _transceiverIdPeerIdMap
   * @type Object
   * @private
   * @for Skylink
   * @since 0.6.31
   */
  this._transceiverIdPeerIdMap = {};
 
  /**
   * (Extra) Tracks requested by the Peer/MCU in welcome/restart message. Used to create transceivers before createOffer.
   * @attribute _transceiverIdPeerIdMap
   * @type Object
   * @private
   * @for Skylink
   * @since 0.6.31
   */
  this._currentRequestedTracks = { audio: 0, video: 0 };
 
  /**
   * Originally negotiated DTLS role of this peer.
   * @attribute _originalDTLSRole
   * @type String
   * @private
   * @for Skylink
   * @since 1.0.0
   */
  this._originalDTLSRole = null;
}