protected function init($ftkey)
  {
    if(strlen($ftkey) != 32 && strlen($ftkey) != 16)
    {
      throw new TeamSpeak3_Adapter_FileTransfer_Exception("invalid file transfer key format");
    }

    $this->getProfiler()->start();
    $this->getTransport()->send($ftkey);

    TeamSpeak3_Helper_Signal::getInstance()->emit("filetransferHandshake", $this);
  }