Native Android app that acts as a standalone mobile gateway bridging Meshtastic mesh (BLE), Iridium 9603N satellite (HC-05 Bluetooth SPP), and cellular SMS. The phone IS the gateway in the field.
- Meshtastic BLE radio connection -- scan, connect, send/receive mesh messages
- Iridium 9603N via HC-05 Bluetooth SPP -- SBD send/receive, signal polling
- SMS gateway with AES-256-GCM encryption -- per-conversation keys
- MSVQ-SC lossy semantic compression -- 92% savings on field messages
- Forwarding rules engine -- mesh<->iridium<->SMS routing
- Node map with phone GPS + mesh node positions
- 6-hour signal history graphs -- mesh RSSI, Iridium signal, cellular dBm
- SOS emergency broadcast -- mesh + Iridium + SMS, 3x with 30s interval
- Push notifications for incoming messages
- Material 3 dark theme UI (Jetpack Compose)
Phone (MeshSat-Android)
|
+-- BLE -----------> Meshtastic radio
|
+-- Bluetooth SPP --> HC-05 --> RockBLOCK 9603N (Iridium)
|
+-- Native SMS -----> Cellular network
|
+-- Rules engine + AES-256-GCM encryption
|
+-- MSVQ-SC semantic compression (ONNX Runtime)
- Android 8.0+ (API 26)
- Bluetooth LE
- SMS permissions
| Component | Purpose | Notes |
|---|---|---|
| Meshtastic radio | LoRa mesh | Any BLE-capable device (T-Deck, T-Echo, Heltec, etc.) |
| Iridium 9603N / RockBLOCK 9603 | Satellite modem | Needs separate power (up to 1.5A during TX) |
| HC-05 Bluetooth adapter | Bluetooth-to-serial bridge | 3.3V TTL, set to 19200 baud |
| Android phone | Gateway host | Built-in cellular modem for SMS |
HC-05 TX --> RockBLOCK RX (pin 6)
HC-05 RX <-- RockBLOCK TX (pin 5)
HC-05 VCC --> 3.3V
HC-05 GND --> GND
Set HC-05 baud rate before use: AT+UART=19200,0,0
Requires Android SDK and JDK 17.
./gradlew assembleDebug- Language: Kotlin
- UI: Jetpack Compose (Material 3)
- Database: Room (SQLite)
- ML Runtime: ONNX Runtime (MSVQ-SC compression)
- Concurrency: Kotlin Coroutines
- Min SDK: Android 8.0 (API 26)
MeshSat-Android and MeshSat (Pi/Linux) share the same AES-256-GCM + base64 codec, enabling encrypted peer-to-peer communication over SMS. Two mesh networks can be bridged over cellular:
[Mesh A] --LoRa--> [MeshSat Pi] --encrypted SMS--> [MeshSat-Android] --BLE--> [Mesh B]
Both nodes are peers -- configure the same encryption key on both sides and set up forwarding rules to route between mesh and SMS. The cellular link becomes a transparent, encrypted bridge between two otherwise isolated LoRa mesh networks.
- MeshSat -- Go Pi/Linux gateway (same concept, USB devices instead of Bluetooth)
- Meshtastic-Android -- Official Meshtastic app (BLE protocol reference)
Early development. Tracking issue: CUBEOS-70.
Copyright 2026 Nuclear Lighters Inc. Licensed under the Apache License 2.0.