Rut 951 port 47808


I would like to connect to my PLC with an RUT 951 via the SIM card. For this I created a VPN with OpenVPN and I can ping and connect to the PLC’s webserver. But I can’t find it on BACNET which uses port 47808. In the OpenVPN log file I can see that the port created is 36584. I used RMS VPN to creat OVPN file.

How can I discover my PLC on port 47808 ?