int hello(void)
{
  int result;

  if (udpmain->Connected())
  {
    sprintf(DataOut, "%s", "Are_you_KAU-2?\r\n");
    udpmain->Send(DataOut, 0);

    int i = udpmain->ReceiveBuffer(rec, 300);
    if(i==0)
    {
      sprintf(str, "%s", "Device not detected!\r\n");
      result = error_no_answer;
      kau2_disconnect();
    }
    else
    {
      BytesToRaw(rec, rec_char, 8);
      if (strcmp(rec_char, "Yes_I_am") == 0)
      {
        result = error_success;
      }
      else
      {
        result = error_bad_answer;
        kau2_disconnect();
      }
    }
  }
  else
  {
    result = error_socket;
    kau2_disconnect();
  }

  memset(DataOut, NULL, sizeof(str));
  rec[0] = 0;
  memset(rec_char, NULL, sizeof(rec_char));
  return result;
}