Civitas : A bluetooth disaster management System

Civitas is a disaster management app using Bluetooth mesh + Chrome AI to keep citizens, rescuers & governments connected with alerts, translation & offline fallback—when networks fail, Civitas works.

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Civitas: A Bluetooth Disaster Management System

Overview

Civitas is an offline-first, Bluetooth-based disaster communication system that maintains emergency connectivity when internet and cellular networks fail. It uses BLE mesh networking and Chrome built-in AI to coordinate alerts, missions, and rescue operations.

Inspiration

During disasters, networks fail first, leaving communities isolated. Civitas was born from one powerful question:

“If we lose the network, can we still save each other?”

The mission is to ensure communication even during complete infrastructure collapse through local Bluetooth connectivity and AI-assisted communication.

What it does

  • Sends and receives emergency alerts via BLE mesh
  • Syncs missions, safehouse info, and resource logs offline
  • Translates, rewrites, and summarizes alerts using built-in AI
  • Works as an offline-capable PWA across devices
  • Automatically syncs to cloud when internet returns
  • Provides role-based access for citizens, responders, and officials

How we built it

Frontend (PWA)

  • HTML5, CSS3, JavaScript (ES6+)
  • Web Bluetooth API for mesh device discovery & communication
  • IndexedDB for offline data store
  • Service Workers for caching and background sync

Backend (Flask)

  • Flask 3.0 + SQLAlchemy ORM
  • REST APIs for mission & role management
  • BLE sync endpoints with encryption
  • Chrome Nano AI APIs for rewriting, summarizing, translating alerts

Database & Deployment

  • SQLite (local) → PostgreSQL (production)
  • Dockerized stack
  • Nginx + Gunicorn on Ubuntu
  • Health-check endpoints

Target Latency

< 500ms BLE mesh message latency

Challenges

  • Web Bluetooth limitations across platforms
  • Preventing BLE mesh looping/packet storms
  • Timestamp-based conflict resolution in offline sync
  • AES-256 encryption within browser BLE environment
  • AI fallback when Chrome offline AI unavailable

Accomplishments

  • End-to-end BLE mesh communication without internet
  • Fully functional offline-first PWA
  • Multilingual AI emergency communication
  • Scalable modular backend + container deployment
  • Real-time field testing of BLE mesh behavior

What we learned

  • Offline-first changes system design priorities
  • Web Bluetooth is a powerful emergency technology
  • AI + BLE + PWA bridges intelligence and offline reliability
  • Disaster UX must prioritize human accessibility over perfection

Core Formula

AI + BLE + PWA = Resilient Crisis Connectivity

What's next

  • Drone, IoT sensor, wearable integration
  • AI-powered early disaster detection
  • Real-time multilingual voice alerts
  • Satellite fallback connectivity
  • Open-source global community deployment

Closing Note

Civitas ensures communication when everything else fails — because one message during a crisis can save a life.

when using the project link:

use login credentials :

username: "citizen@civitas.com" password:"password123" username: "rescuers@civitas.com" password:"password123" username: "government@civitas.com" password:"password123"

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