May I ask, how do you do the multiplayer, using the 3G phone network or using wifi or using bluetooth?
ErnCon is meant to be played over the Internet so 3G or WiFi (connected to the Internet of course).
And what strategy do you use for sync'ing everything?
ErnCon is essentially using a Java implementation of the Quake 3 networking model. I followed this article: http://web.archive.org/web/20060322211154/http://www.bookofhook.com/Article/GameDevelopment/TheQuake3NetworkingModel.html
The above article only describes the networking layer so I still had to come up with things like client-side interpolation to mask lag, serializing/deserializing game objects to/from the network stream, etc.
Must have been a royal pain to work that out. Well done getting it to run in a polished game.
Thanks! I actually implemented this in FRG multiplayer about a year ago so I wasn't starting from scratch for ErnCon. The effort I put into FRG multiplayer was still almost a year of my spare time but it was really fun and interesting!
If you have any specific questions about ErnCon's networking model, please ask! I'm always up for knowledge sharing.