26    private function __construct(){
 
   41    public const PACKET_ENCAPSULATED = 0x01;
 
   51    public const PACKET_OPEN_SESSION = 0x02;
 
   58    public const PACKET_CLOSE_SESSION = 0x03;
 
   65    public const PACKET_ACK_NOTIFICATION = 0x04;
 
   72    public const PACKET_REPORT_BANDWIDTH_STATS = 0x05;
 
   81    public const PACKET_RAW = 0x06;
 
   88    public const PACKET_REPORT_PING = 0x07;