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vossbol - a demo of voice-over-tinySSB-over-LoRa

August 2022

This repo contains a demo for compressed voice carried over a Secure Scuttlebutt-like replication fabric (off-line first i.e, it tolerates intermittent connectivity) using LoRa, or long range radio, as physical layer.

The tinySSB layer provides a combination of self-configuration (new users are automatically onboarded), reliable broadcast and a persistency service in an integrated way. Packets are 120 Bytes long.

Technology stack included in this repo

  • Android app (Tremola) with Codec2 voice compression
  • tinySSB packet format, append-only log and replication protocol
  • LoRa using the "T-Beam" ESP32 device
Smartphone1                             Smartphone2          Smartphone3
     \                                       |                  /
    WiFi                                    WiFi             WiFi
       \                                     |                /
     T-Beam ...LoRa... T-Beam ...LoRa... T-Beam ...LoRa... T-Beam
        %                 %                %                %
    replicas          replicas          replicas         replicas (on Flash)

Software

  • directory esp32 (currently for T-Beam)
  • directory android (tinyTremola Android app)
  • directory py (command line scripts to interact with the mesh)