Server: reuse UDP socket #49
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Reasons: * Save file-descriptors * Support clients behind NAT
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Reasons:
In the process I renamed
_udpServerto_udpSocketfor clarity.The same should be done for the client side. It makes even more sense there, because P2P apps shouldn't waste file-descriptors, especially because clients need to have these sockets opened for a longer time. Yet the changes will be larger as we need to demux responses from multiple servers with different connection/transaction ids.