The CTC App starts but does not show any modules

  1. Check if you are connected to the correct LAN/WLAN.
  2. Check if your LAN is connected to a different network than your WLAN.
  3. Check if your firewall allows UDP communication on ports 9750 and 9751.

How do I check if data packets are flowing?

This is best done with the program Wireshark.

Use the following filter rule
udp.port==9751

How do I check if the app could register the ports?

Linux

Command:
lsof -Pnl +M -i
or
netstat -tlnup

Lists all registered ports. You should see “java” next to “UDP *:9750” and “UDP *:9751”. Both entries should disappear when you close the CTC app.

Instructions on lsof can be found here

How do I check if the firewall is blocking ports?

Ubuntu Linux

Command:
sudo ufw status verbose

Instructions can be found here

Device modules are missing in the app

Neither locomotives nor turnouts are shown in the app

  • Check if your PC/Tablet/Smartphone is connected to the correct network (WLAN).
  • Ensure that you are only connected to one network:
    • If you are connected to a different network via cable than via WLAN, communication with the device modules will not work.
    • If you have “Mobile Data” active on a smartphone/tablet, communication with the device modules will only partly work.
  • Open Settings/Configurator. All device modules will be displayed there, especially those where an error occurred.

A single locomotive or turnout is not shown

  • Open Settings/Configurator. All device modules will be displayed there, especially those where an error occurred. If the module appears there as “UnknownDevice”, an error message will be displayed under Last Data Packet in its edit dialog.

General communication disruptions

High number of #msgMiss in the statistics display

  • Check if a Set Motor dialog is open. In this case, the locomotive sends its motor data unsynchronized.
  • Connect your PC to the model railway WLAN router via cable. Poor drivers can lead to a “hard-of-hearing” PC.
  • Check who else is active in your model railway WLAN. Especially if your model railway WLAN also has an internet connection, “chatty” apps on PC/Tablet/SmartPhone can interfere with communication with the device modules.
  • Check what other WLANs are in your vicinity and on which channels they are transmitting. This can be done, for example, via the FritzBox interface or special apps for tablets/smartphones.

The CTC module no longer starts after changes to the configuration

As long as you made the changes with the CTC app, this should not actually happen. Please inform us in any case of what you did so that we can track down and fix the error.

To revive your CTC module, replace the configuration (cfg.xml) on the CTC module with an empty configuration. Proceed as follows:

  1. Turn off your model railway WLAN.
  2. Connect the CTC module to power - it should now switch to configuration mode and open its own WLAN.
  3. Connect from your PC to the WLAN of the CTC module.
  4. Open the internet browser and go to http://192.168.4.1
  5. Click on “Upload file” and select the file “cfg.xml” from the “config” folder of your CTC app.

iPhone/iPad shows no CTC modules

Although the iPhone/iPad is connected to the correct WLAN, it does not show any CTC modules.

  • Check under the iPhone/iPad settings in the “Privacy / Local Network” area if the CTC app is listed and activated there.