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e683ab933f
Room servers forward messages with the original author's 4-byte public key prefix (roomPostAuthorPrefix). Was ignoring this — all room messages showed the room server's name as sender. Now resolves the actual poster's name from roomPostAuthorPrefix by matching against the contacts list. Falls back to room server name if the author isn't a known contact. Also fixes findContactByPrefix to accept 4-byte prefixes (was rejecting anything shorter than 6 bytes). Fixes #22
MeshCore SAR
Field-ready Search and Rescue coordination over MeshCore + BLE
MeshCore SAR helps teams coordinate in low-connectivity or no-connectivity environments with messaging, voice, images, maps, and live location context in one app.
It uses the MeshCore protocol over LoRa for long-range, infrastructure-free communication.
iOS TestFlight: https://testflight.apple.com/join/nCZYMPPz
Highlights
- Rapid mesh chat for both 1:1 and group coordination
- On-demand voice (Codec2) and image (AVIF) transfer tuned for low-bandwidth links
- Offline-first mapping with tactical overlays and SAR incident markers
- Live team location, movement trails, and shareable tactical drawings
Demo Video
Screenshots
Feature Overview
| Area | What you get |
|---|---|
| Messaging | Direct and group chat over mesh, with contact/room awareness from live telemetry |
| Voice | Push-to-talk voice clips (Codec2), fetched on demand when play is pressed, auto-play on completion |
| Images | Camera/gallery image sending (AVIF), auto-compression, tap-to-load receiving, full-screen viewer |
| Maps | Street/topo/satellite/terrain layers, offline tile downloads, optional MBTiles import |
| SAR Operations | Team markers with freshness indicators, SAR markers for incidents and staging points |
| Tracking | Continuous GPS updates, personal trails, distance/duration trail stats |
| Trail Interop | GPX export/import for trail sharing and reuse |
| Tactical Drawing | Line/rectangle drawing, distance measurement, drawing sharing to channel/room |
Voice, Image, and Maps
Voice
- Built for short, urgent field communication
- On-demand playback fetch reduces unnecessary mesh traffic
- Ideal when typing is impractical during active operations
Images
- Pre-send optimization for constrained links
- Tap-to-load receiving keeps channels lightweight
- Full-screen view supports rapid field verification
Maps
- Works in both online and offline workflows
- SAR context with team markers, incident markers, and orientation tools
- Combines location, messaging, and tactical layers in one place
Built For
- Search and Rescue field teams
- Incident command and coordination roles
- Operators working in weak/no cellular coverage
Permissions (App Use)
- Bluetooth: mesh device communication
- Location: team tracking and map position updates
- Microphone: voice clip recording
- Camera / Photos: image messaging