After trying different things, I'm stuck on my project. I'm a linux noob, so this doesn't help for sure.
There is my project : I want my rpi 3b+ to be a DLNA server for my DAC player with an independent network, to avoid my bad web speed, because hi-res files are way to heavy to be streamed with my actual network.
At least, the DLNA server work, but I can see it only on my pc and my smartphone, my DAC doesn't see it even I'm on the same network (set up with minidlna). So there is my first problem.
But my major problem is the parallel network setup. I have a really really bad web speed, so I want to get rid of it by creating an Ad-Hoc network completely independent and generate by the rpi. The only time I finally get a WiFi created by the rpi, my DAC didn't saw it at all, and my phone just don't want to connect to it.
The question is : how can I have a fully independent WiFi for my DNLA server that can be accessible with android devices ? And is it actually possible with just the rpi alone ?
Thank you very much for your help!
EDIT : Things are done !