Thanks Helmut. Before i try, one question: My OH 2.5 sits in one network 192.168.X.Z whilst the KNXnet/IP Router sits in a network that is 192.168.200.0/24. Both are connected via a firewall that opens the port 3671.
Considering this:
(internally ipAddress=“224.0.23.12” is used then over udp, which is the official Multicast Address)
it would in my understanding then require that the OH 2.5 device can send towards 224.0.23.12 into the network where the KNXnet/IP Router device sits. Correct?
Second question, I am very interested into your statement regarding 224.0.23.12 / udp / multicast. Is there any further documentation available? Do you know?