True P2P messenger on top of Yggdrasil Network (Alpha version)

We are taught that we can't communicate without servers. Why? Because we have NATs everywhere. We can't connect to each other without getting involved in some port-forwarding, STUN/TURN servers configurations or something like that. And even if you do all of that chances are that you couldn't connect to your contact because you have wrong type of NAT. Only torrents circumvent these problems, and just because of some nodes that have