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Is WebRTC not browser to browser? Think websockets would be better suited for this problem.

Yes but you can't use all featuers in all browsers as far as I know. WebRTC in this case would be used to connect to TURN/STUN servers.

Again, no clue what I'm talking about. But I suspect the ability to support in-browser TURN/STUN handshakes is what's holding ios back.