listen to both IPV6 and IPV4 incoming connections: binding to "::" implies using both protocols #1290
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…plies both protocols
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Listen to both IPV4 and IPV6 incoming connections
Closes #1068
Why? Up to now the snapcast server only listens for IPV4 connections. This is a problem with clients that try a IPV6 connection first, and then do not quickly fall back to IPV4 (I think it was the Android snapclient app).
[x] This PR has been tested on Linux (Ubuntu).
Testing on Windows is not required - as per CMakeLists.txt the server is not built on Windows anyway.
A note on the code change: one could think of adding "::" to the list of addresses to listen to, like {{"0.0.0.0"}, {"::"}}
But that leads to a runtime error "address already in use", because the second list element, "::", implies binding to IPV4 as well, but that has already been done.
(You see the same when you configure both "0.0.0.0" and "::" as addresses in the config file, btw.)