Can I send data to another user without (signalling) Server ?
E.g. is there a way to send "data x" to someone whose IP i know ?
If so, which Computer/Internet Information are Needed to successfully Transfer data peer to peer ?
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WebRTC can't connect directly to an IP. It needs to exchange the offer/answer and ICE candidates from both ends. The easiest way to do that is via a web server, which is the signalling server.