First thing that occurred to me was WebRTC for P2P chat using an IP address in the STUN fallback list if DNS fails? As in https://github.com/michal-wrzosek/p2p-

First thing that occurred to me was WebRTC for P2P chat using an IP address in the STUN fallback list if DNS fails? As in https://github.com/michal-wrzosek/p2p-chat https://github.com/michal-wrzosek/p2p-chat