offline-communication

A curated list of open protocols, applications, hardware, and resources for communication during internet shutdowns, disasters, intermittent connectivity, and off-grid operation.

Quantum-Resistant, AI-Powered Offline Mesh Communication via WiFi & Bluetooth

Research-oriented acoustic communication platform that transmits digital images through sound using Multiple Frequency Shift Keying (MFSK), enabling offline image communication for signal processing, biomedical engineering, and resilient communication research.

Encrypted, sound-based communication app for Android and PC using GGWave protocol. Secure, offline, and air-gapped.

Android-only React Native module for peer-to-peer communication using Wi-Fi Direct. Ideal for offline messaging and file sharing.

Official firmware distribution and installation guide for MeshGrid-Node. Secure ESP32-based LoRa mesh communication for the MeshGrid ecosystem.

A tool for encoding large text or files into multiple QR codes arranged in arrays, and decoding them back, ideal for offline data transfer between isolated networks.

Vajra is a decentralized, software-defined emergency mesh network for scenarios where cellular and Wi-Fi fail. It enables smartphones to broadcast and relay SOS signals and GPS coordinates using only Bluetooth (BLE). Features include 1-byte intent compression, high-detail offline mapping, and a 1-10m proximity alert—all on existing hardware.

An advanced, dependency-free acoustic data transceiver and kinetic transmission protocol written from scratch in pure C++17. Modulates text data into near-ultrasonic frequencies and mechanical vibrations, bypassing jammed or dead RF radio frequencies during total network blackouts.

No internet communication in times of emergencies!

An open source Acoustic Data Transmission Messenger which transmit text through the air using sound. No internet. No Bluetooth

No internet, no cloud, no GSM :- LoRa-based offline peer-to-peer communication system for explorers - ESP32 firmware + Flutter app.

A simple half-duplex audio chat using GGWave, with a real-time volume meter to monitor microphone input levels. It encodes and decodes messages using sound-based data transfer.

A Bluetooth Low Energy mesh messaging app for Android — no internet, no pairing, no setup needed. Currently supports direct 2-device chat; building towards multi-hop mesh relay where messages pass through intermediate devices to reach anyone in range. Built with Kotlin & Jetpack Compose.

Offline communication hub for disaster relief inspired-by-piratebox- Deploy chat, file sharing, and tactical mapping on DD-WRT routers