MeshTRX

Decentralized voice mesh network over LoRa + BLE

MeshTRX is an open-source communication system that provides PTT voice, text messaging, file transfer, and GPS tracking over LoRa radio — independent of cellular networks and internet.

[Phone A] <--BLE--> [Heltec A] <--LoRa 868MHz--> [Heltec B] <--BLE--> [Desktop B] Features Voice — Codec2 3200 bps, PTT and VOX modes, roger beep, noise gate; a single transmission is capped at 10 seconds so the half-duplex channel never stays occupied, with a countdown on the button and the same limit enforced in firmware Desktop client — Windows, Linux and macOS (Python + PySide6), same features over the same BLE protocol Messaging — Text chat up to 84 chars, broadcast or direct Files — Photo and file transfer up to 100 KB over LoRa Map & Radar — OpenStreetMap + tactical radar with zoom and contrast, peer positions via GPS Splash screen — Animated launch screen with version info Calls — All-call, private, group (up to 8 members) 23 Channels — EU868 band (863–870 MHz), 300 kHz spacing Repeater — Store & forward mode with WiFi web monitoring Localization — English and Russian

Hardware Device: Heltec WiFi LoRa 32 V3 or V4 (ESP32-S3 + SX1262) Board revisions: V4 comes as rev 4.2 (GC1109 front-end) and rev 4.3 (KCT8103L). They need different firmware builds — see the table in the User Guide Client: Android 5.0+ with BLE, or a desktop running the Python client Range: 5+ km line of sight, extendable with repeaters