public function sendLine($data, $separator = "\n")
  {
    $size = strlen($data);
    $pack = 4096;

    for($seek = 0 ;$seek < $size;)
    {
      $rest = $size-$seek;
      $pack = $rest < $pack ? $rest : $pack;
      $buff = substr($data, $seek, $pack);
      $seek = $seek+$pack;

      if($seek >= $size) $buff .= $separator;

      $this->send($buff);
    }
  }