Nick Howitt wrote:

As far as I am aware, uPnP does not feature in this. I think MiniuPnP's role is to just map external port forwards automatically. I don't know how device discovery works for other devices.

Interesting, I thought it also allowed the devices on your home network to discover each other and access certain services. Thanks for your help in all of this, if I find additional information I will chime in.