I'm no expert, but a JSON or XML has to be generated for Direct Publisher to work no matter what your server is. I'm not familiar with "Serviio DLNA server" but DP only works with JSON and XML files. As long as the server can serve up HTTP protocol you should be good.
What is generating the XML files for your channel? What does that look like? If this is just being hosted locally then it should work but the json still has to be there.
I know that's not very helpful, but can you give some additional information about the links that are being provided? The API is probably not going to be an option for a DP channel. I still haven't figured out Brightscript or the SDK enough to help with getting that up and going. (If there are anybody who can provide some insight on that it would be AWESOME.)
