Here are some answers to your questions:
Binding looks to run, that´s what the bundle:list says
This is also the state after a restart.
After the (automatic AND the manual) discovery failed, i added the thing manually. Deleted them in the meantime.
Installing the HUE-Binding and/or HUE-Emulation did not change anything, still the discovery do not find anything:
IP-Adress on the receiver is verified to be 192.168.0.42, network-config on the MR401 is ok (and btw. working well.
The system do not run on a raspberry but on a virual Linux-machine (i do not think that makes a difference). But at least, the linux-box is not using WLAN but a cable-connection, so bridge-mode on the fritz should not be necessary (it is anyhow switched on, so also not a issue).
@hmerk: As the receiver is controlable with the mobile-app, i assume the remote-connection IS switched on and working. There is only a setting “mobile Geräte können sich verbinden”, which is think is the one you are looking for. And this on is ticked on.
start of the bundle in openhab looks also pretty ok, until up to an error “unknown:512”. Maybe this points into the right direction??