https://blog.logrocket.com/get-a-basic-chat-application-working-with-webrtc/
https://webrtc.github.io/samples/src/content/peerconnection/pc1/ https://github.com/webrtc/samples/blob/gh-pages/src/content/peerconnection/pc1/js/main.js
https://webrtc.github.io/samples/src/content/peerconnection/audio/ https://github.com/webrtc/samples/blob/gh-pages/src/content/peerconnection/audio/js/main.js