Every Thinka PRO has a built-in IP Gateway, To enable it go to the web interface of your Thinka, navigate to the KNX menu and click on "Start KNX IP interface"
In case something is not clear or not working according to your expectation you can contact us, and we will provide instant feedback. We can be reached by email at support@thinka.eu, or by phone at +31-20-2420666