Offline Messaging & Calling App

Overview

This project is a mobile application that enables offline messaging and calling without relying on mobile networks. It utilizes Wi-Fi Direct and Bluetooth for peer-to-peer (P2P) communication and allows opportunistic syncing when an internet connection is available.

Tech Stack

• Frontend: React Native (for mobile), TailwindCSS (for styling)
• Backend: Node.js with Express (for optional cloud syncing)
• Database: Local Storage (AsyncStorage) + Firebase (for online backup)
• Networking: Wi-Fi Direct, Bluetooth, WebRTC (optional for internet-based syncing)

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App Architecture

The app follows a modular structure, focusing on different layers:

1. UI Layer (Frontend): Manages the user interface and interactions.
2. Network Layer: Handles P2P communication via Wi-Fi Direct and Bluetooth.
3. Data Layer: Stores messages locally and syncs them when online.
4. Backend API (Optional): If cloud sync is enabled, this API facilitates message backup and retrieval.

📂 project-root/
 ├── 📂 src/
 │   ├── 📂 components/     # Reusable UI components (buttons, inputs, etc.)
 │   ├── 📂 screens/        # Home, Chat, Call, Settings screens
 │   ├── 📂 services/       # Wi-Fi Direct & Bluetooth connection handlers
 │   ├── 📂 utils/          # Helper functions for networking & storage
 │   ├── App.js            # Main entry point
 ├── 📂 backend/           # Optional cloud syncing backend
 ├── README.md             # Project Documentation

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UI Flow

1. Welcome Screen

• Displays app logo and a "Get Started" button.
• On click, navigates to the Home Screen.

2. Home Screen

• Lists nearby users detected via Wi-Fi Direct / Bluetooth.
• Shows recent conversations.
• Allows starting a new chat or calling a user.

3. Chat Screen

• Displays conversation history.
• Users can send text messages via P2P communication.
• Messages are marked as Sent, Delivered, or Pending based on connection status.

4. Call Screen

• Enables direct VoIP calls over Wi-Fi Direct.
• Includes Mute, Speaker, and End Call buttons.

5. Settings Screen

• Toggle Wi-Fi Direct / Bluetooth.
• Enable message syncing when an internet connection is available.
• View app version and about information.

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Installation & Setup

1. Clone the Repository:

   git clone https://github.com/your-repo/offline-messaging-app.git
   cd offline-messaging-app

2. Install Dependencies:

   npm install  # or yarn install

3. Run the App:

   npm start  # Starts the app

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Future Enhancements

• File Sharing via Wi-Fi Direct
• Group Chats using Mesh Networking
• End-to-End Encryption for secure messaging

🚀 Contributions are welcome! Feel free to open an issue or submit a PR.