Network API

[sphinxc0re]

I've got UDP working quite nicely, I even wrote a simple plugin that broadcasts the server's existence on LAN (so that vanilla client sees the local servers automatically without the need to add them - http://wiki.vg/Lan_Worlds)

Now I just need to make it compile under Linux, there are so many minor incompatibilities in there! Functions taking size_t instead of int params, etc.

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Plugin's here: https://github.com/madmaxoft/LANBroadcaster

You should implement this into core