code: function PacketPong(properties) {
  			if (properties)
  				for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
  					if (properties[keys[i]] != null)
  						this[keys[i]] = properties[keys[i]];
  		}
docs: Properties of a PacketPong.
  @memberof packets
  @interface IPacketPong
  @property {string} ver PacketPong ver
  @property {string} sender PacketPong sender
  @property {number|Long} time PacketPong time
  @property {number|Long} arrived PacketPong arrived
   
  Constructs a new PacketPong.
  @memberof packets
  @classdesc Represents a PacketPong.
  @implements IPacketPong
  @constructor
  @param {packets.IPacketPong=} [properties] Properties to set