I've seen your issue about multiplayer
https://github.com/VDrift/vdrift/issues/75
It is probably difficult, but quite possible to move it to VDrift too.
Feel free to join us on irc if you have questions (info on homepage).
Originally aave wrote it, and his code is nicer to read than mine
, so he is also the best guy to answer, but I have also medium knowledge of multiplayer code.
And there is also a short doc about implementation in source/network/DesignDoc.txt in our code.
The whole code for network is about in source/network/*.* files. In source/ogre/Gui_Network.cpp are events from Gui. Also at end of source/vdrift/car.cpp are car pos. updates from network.