boolean isDeviceOnPort(const char name[], int port) {
  SerialShield.setMessageContent("ping");
  SerialShield.setMessageSender("xyz89");
  SerialShield.setMessageDestination(name);
  do
  ;
  while(!SerialShield.sendASSPMessage(port));

     for (int i = 0; i < 50; i++) {
      if (SerialShield.fetchASSPMessage()) {
        return 1;
        break;
      }
      else if(i==49 && !SerialShield.fetchASSPMessage())
        return 0;
      }
    }