feat: WebRTC Peer-to-Peer Mesh for Offline Field Device Sync (#65)#75
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elizabetheonoja-art merged 1 commit intoJun 24, 2026
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Utility-Protocol#65) - Implement Lamport vector clock with tick/merge/compare for CRDT conflict resolution - Build SyncPeer class with RTCPeerConnection lifecycle, SCTP data channel, message framing - Build SyncMesh manager with spanning tree routing for >20 peers - Build SignalingClient with WebSocket-based SDP/ICE exchange and reconnection - Build QRDiscovery utility for QR-code fallback manual SDP exchange - Create syncStore as lightweight reactive state store for peers/outbox/vector clocks - Implement useOfflineSync hook orchestrating mesh, signaling, and QR fallback - Wire SDP offers, answers, and ICE candidates through the signaling relay - Add 10 unit tests for VectorClock (tick, merge, compare, serialization, clone)
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Summary
Implements Issue #65: WebRTC Peer-to-Peer Mesh for Offline Field Device Sync with CRDT Merge and QR Fallback Discovery.
Changes
Vector Clock (CRDT):
src/utils/vectorClock.ts— Lamport vector clock with tick(), merge(), compare() (Before/After/Concurrent), JSON serialization, and cloneWebRTC Core:
src/services/webrtc/SyncPeer.ts— Manages a single RTCPeerConnection lifecycle, SCTP data channel, message framing/chunking (14KB safe limit), reconnection with exponential backoff. Emits SDP offers and ICE candidates for signaling relay.src/services/webrtc/SyncMesh.ts— Mesh manager with Map<peerId, SyncPeer>. Full mesh for ≤20 peers, minimum spanning tree routing (latency-based) for >20 peers. Relays SDP/ICE through MeshEvent.Signaling:
src/services/webrtc/SignalingClient.ts— WebSocket signaling client at wss://signal.utilityprotocol.com. Exchanges SDP offers/answers and ICE candidates with reconnection.src/services/webrtc/QRDiscovery.ts— QR code fallback for offline discovery. Generates PNG data URLs via qrcode library, decodes scanned payloads with FNV-1a checksum validation.State Management:
src/store/syncStore.ts— Lightweight reactive sync state store (no Redux dependency). Tracks peers, outbox queue, and per-peer vector clocks with subscription pattern.React Hook:
src/hooks/useOfflineSync.ts— Orchestrates the full sync flow: initializes mesh, connects signaling, wires SDP answer/ICE relay, processes incoming entries via CRDT merge, supports QR fallback for offline mode.Tests:
tests/unit/vectorClock.test.ts— 10 unit tests: tick, merge commutativity, Before/After/Concurrent ordering, empty clocks, JSON round-trip, clone independenceCloses #65