A webrtc demo on RTCPeerConnection api, communication between two devices in LAN

dev

• peers exchange SDP(offer, answer) and ICE candidates via signaling server, ICE server is unneeded in LAN

• mediaDevices.getUserMedia must using HTTPS or the file:/// URL scheme, or a page loaded from localhost

• HTTPS connect to insecure ws will be blocked by many browsers due to security problems, if using HTTPS then must using wss

• self-signed SSL CA certificates by mkcert

• sigs is a signaling server writen by golang gorilla websocket

• websocket server serve a / route for SSL warning, wss connection from 192.168.101.* will be blocked, accept untrusted certificate before connect to wss

• RTCDataChannel relies on SCTP transport layer, reliable and ordered data transfer like TCP and message-based data like UDP

• firefox about:webrtc

reference

• Basic peer connection demo between two tabs

• Signaling and video calling

• https://webrtc.github.io/samples/

• WebRTC API

• Why does my wss:// (WebSockets over SSL/TLS) connection immediately disconnect without giving any errors?

• Secure websockets with self-signed certificate