boolean isDeviceOnPort(const char name[], int port) {
  SerialShield.setMessageContent("ping");
  SerialShield.setMessageSender("xyz89");
  SerialShield.setMessageDestination(name);
  for (int i = 0; i < 10; i++) {
    SerialShield.sendASSPMessage(port);
    for (int t = 0; t < 5; t++) {
      if (SerialShield.fetchASSPMessage()) {
        Serial.println("connected");
      }
      else {
        Serial.println("not connected");
      }
    }
  }
}