Family messaging · offline-first

CruiseMesh

Text your family on a cruise ship — or anywhere coverage is unreliable — over a delay-tolerant Bluetooth mesh, with end-to-end encryption and an optional internet relay when someone gets online.

View on GitHub Read the design

📡

Phone-to-phone mesh

BLE store-and-forward carries messages when Wi‑Fi and cellular are gone. Minutes of delay are fine.

🔒

End-to-end encrypted

Sealed envelopes only. Relays and strangers’ phones never see plaintext — including delivery receipts.

🌐

Optional internet relay

One device with a Wi‑Fi package becomes the family uplink. Self-hostable mailbox on a cheap VPS.

How delivery works

Direct contact — within Bluetooth range of the recipient.
Data mule — a family member’s phone picks up your queued message and carries it until paths cross.
Internet relay — any phone with network syncs the family’s sealed queue through the relay.

This deployment

Public relay host configured relay.davidjacobson.work /healthz

Phones point at https://relay.davidjacobson.work with a family bearer token (from friend cards / app settings). The relay stores sealed envelopes only — content-agnostic mailbox with REST poll and WebSocket push.

Apps

Android (Kotlin / Jetpack Compose) and iOS (SwiftUI) clients live in the open-source repo. Shared crypto and sync logic is a Rust core via UniFFI. Store listings are not public yet — build from source for now.