20    public static $ID = MessageIdentifiers::ID_INCOMPATIBLE_PROTOCOL_VERSION;
 
   22    public int $protocolVersion;
 
   25    public static function create(
int $protocolVersion, 
int $serverId) : 
self{
 
   27        $result->protocolVersion = $protocolVersion;
 
   28        $result->serverId = $serverId;
 
   33        $out->putByte($this->protocolVersion);
 
   35        $out->putLong($this->serverId);
 
   39        $this->protocolVersion = $in->getByte();
 
   41        $this->serverId = $in->
getLong();