Seamless mobile real-time communication with WebRTC
summary
A cloud‑gaming remote‑controller prototype uses WebRTC data channels for low‑latency input and video over UDP, a tiny Ktor websocket signaling server (five lines in the demo) to exchange SDP and ICE candidates, and Google’s libWebRTC (or LiveKit forks) on Android with a Kotlin Multiplatform wrapper for iOS/web. The demo shows local+remote tabs and intentionally degraded remote quality; TURN relays are required in restrictive networks. For scale the architecture moves from mesh to an SFU selective forwarding unit, favoring Ktor websocket signaling and the libWebRTC SDK with state machines and Combine/Flow for robust connection state.
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chapters (17)
- 0:00Introduction
- 1:57WebRTC history
- 5:51WebRTC architectures
- 7:40Peer connection setup
- 9:49ICE candidates & STUN/TURN
- 13:23Signaling servers role
- 15:34Ktor signaling server
- 23:50Android WebRTC SDKs
- 25:39State machines vs async calls
- 27:48WebSocket & WebRTC data
- 31:23Connection repository
- 33:30Android summary
- 34:38Multiplatform WebRTC
- 36:45Multiplatform demo
- 39:58Selective Forwarding Units and scalability
- 41:25WebRTC companies & trends
- 43:13Conclusion
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