# Dhurta Sync

> Zero-backend P2P file sharing, chat, and device sync — no servers, no accounts, no cloud.

## What it does

Dhurta Sync is a web-based peer-to-peer application that lets any two devices share files,
send messages, and make voice/video calls directly — without uploading anything to a server.
It runs entirely in the browser via WebRTC DataChannels and an MQTT mesh for signalling.

## Key capabilities

- **Transfer mode** — AirDrop-style radar UI showing nearby peers on the same PIN room.
  Drag-and-drop or tap-to-select files; binary chunks stream at full SCTP speed (~10 MB/s).
- **Beam mode** — ShareMe / Xender-style send orb. Tap the glowing orb to pick a file,
  watch the progress ring, and browse received media in a thumbnail grid.
- **Chat mode** — WhatsApp-style encrypted messaging over MQTT + WebRTC DataChannel
  with typing indicators, deduplication, and per-device colour avatars.
- **AI Assistant** — In-browser Gemini Nano (window.ai) powers smart file summaries,
  transfer tips, and a chat AI companion with no API key required.
- **QR + PIN join** — Connect devices by scanning a QR code or typing a 4-digit PIN;
  no Bluetooth, no NFC, no app install required.
- **PWA** — Installable, works offline after first load, cache-first service worker.

## Technology

- WebRTC SCTP DataChannels for binary file streaming
- MQTT over WebSocket (EMQX / HiveMQ / Mosquitto mesh) for signalling and chat
- Reed-Solomon GF(256) QR code generator (pure JS, no lib)
- jsQR (camera-based QR scanner)
- Chrome built-in AI (window.ai / Prompt API) for local LLM features
- Service Worker (cache dhurta-v4) for offline PWA

## Intended use cases

File sharing between phones and laptops on the same local network or globally via MQTT broker.
No accounts, no file size limits, end-to-end transport encryption via WebRTC DTLS.

## Source

GitHub: https://github.com/prashantkeshr/Dhurta-Sync
Live:   https://sync.dhurta.com