What is the easiest way to implement local multiplayer in a tactical game on the cocos2d-x engine?

Question

linux

What are the libraries for local multiplayer? Interested in cross-platform solutions.
Maybe there are solutions for bluetooth multiplayer. It will be interesting to hear or see any solutions, maybe someone wrote or there is an open source with cocos2d-x on github. The game is tactical turn-based. I don't want to manually write an implementation for each platform separately :-).