[knx] Prevent reconfigutation of IP routers (#19850)

Follow-up to #19839.
Discover separate Things for KNX IP routers and avoid setting
IP address and port for routers. Routers use a defined multicast
address.

Make sure that Thing for router is separate, event if the same device
exports a tunneling device.

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

Author: holgerfriedrich

bundles/org.openhab.binding.knx/src/main/java/org/openhab/binding/knx/internal/discovery/KNXnetDiscoveryService.java

@@ -119,11 +119,10 @@ private synchronized void startDiscovery() {
                     }
                     if (services.containsKey(ServiceFamiliesDIB.ServiceFamily.Routing)) {
                         // .withProperty("type", "ROUTER") was omitted to avoid reconfiguration
-                        thingDiscovered(DiscoveryResultBuilder.create(new ThingUID(THING_TYPE_IP_BRIDGE, serial))
+                        thingDiscovered(DiscoveryResultBuilder.create(new ThingUID(THING_TYPE_IP_BRIDGE, serial + "-r"))
                                 .withLabel(response.getDevice().getName() + " (router mode)")
-                                .withProperty("serialNumber", serial + "-r").withProperty("ipAddress", "224.0.23.12")
-                                .withProperty("port", "" + response.getControlEndpoint().endpoint().getPort())
-                                .withRepresentationProperty("serialNumber").build());
+                                .withProperty("serialNumber", serial + "-r").withRepresentationProperty("serialNumber")
+                                .build());
                     }
                 } else {
                     logger.trace("Ignoring device {}", response);