I've implemented both UPnP discovery and mDNS, and mDNS was quite a bit easier to make reliable than UPnP. However, if they did have a reliable UPnP system, it would almost certainly destabilise the software for any transition like this. There's just so many different network issues to deal with, it's tough to debug when a user reports a problem and it's probably an issue with their router which is only sold in Germany. It is very frustrating class of bugs, when the app just doesn't find devices on the network.
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