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snowlyg

Posted on • Originally published at lodan.me

Connecting Android WebRTC to a Go gRPC Signaling Gateway

This is a sanitized engineering recap about connecting Android WebRTC clients to a Go gRPC signaling gateway.

Source article:
https://www.lodan.me/posts/golang-grpc-webrtc-android/

The main boundary

The important part is not only creating a PeerConnection. The harder part is keeping signaling, Android lifecycle, and WebRTC media state separated enough to debug.

The boundary I use is:

  • Go/gRPC owns registration, call control, callbacks, and signaling events.
  • Android owns permissions, UI lifecycle, local audio/video resources, and cleanup.
  • WebRTC owns offer/answer, ICE candidates, tracks, and connection state.

Why logs matter

When a call fails, the log needs to connect all layers. Useful fields include:

  • call id
  • peer id
  • action
  • signaling state
  • ICE state
  • selected candidate pair
  • local and remote lifecycle state

Without these fields, the same failure can look like a network issue, a device issue, or a WebRTC SDK issue.

Full article

The full write-up covers gateway startup, device registration, callback boundaries, SdpObserver, PeerConnection.Observer, single-call and multi-call lifecycle, hold, hangup, broadcast, and cleanup:

https://www.lodan.me/posts/golang-grpc-webrtc-android/

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