Hi,
TL;DR : It works now, I was missing a configuration step, thank you.
The long story :
I went over my whole setup, and it turned out that it was my use of pulseaudio-dlna which was lacking.
For the record, to debug this I tried to scan my network for upnp renderer with the gupnp-tools package (from the command line with gsspd-discover and from the graphical interface). Since the runeaudio renderer was showing up and responding to the gupnp controls, I figured something was wrong mostly on the desktop side.
In fine I had to do first :
pulseaudio-dlna --create-device-config
to properly detect and interface pulseaudio with the renderer, and then simply launching
pulseaudio-dlna
enabled me to see the RuneAudio device on the pavucontrol manager and to stream the audio to it easily.
Strange I missed the create-device-config part on the tuto I read about the pulseaudio-dlna package.
Thank you for your time and your responses
