OffCom – Fully Offline Peer-to-Peer Voice Communication

Description

OffCom is a lightweight, browser-based tool for fully offline communication. It removes reliance on internet or mobile data by using a host’s WiFi hotspot and works practically everywhere.

Key Features

• Fully Offline: Host runs a WiFi hotspot without mobile data/internet; all communication stays local.
• Long Range: Operates on standard hotspot range (extends as far as your hotspot signal reaches).
• No Special Hardware: Works on any device with a browser (tested on Android Chrome) and basic hotspot capabilities.
• Mesh Architecutre: Supports multiple guests with a full mesh connection.

Limitations & Drawbacks

• No Persistence: Connection drops if either device closes the browser tab.
• Unencrypted: Data transmission is not encrypted (avoid on public/untrusted networks).

Getting Started

Step 1: Set Up the Host Server (Termux Required)

OffCom needs an HTTPS server to run on Android (Chrome requires secure connections for local files). Use Termux to generate a certificate and start the server:

# 1. Generate SSL certificate (run once in the OffCom folder)  
openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 365 -nodes -subj "/CN=localhost"  

# 2. Start the Python HTTPS server  
python3 signaling_server.py

Keep Termux open in the background, closing it stops the server.

Step 2: Connect Devices

1. Host: Enable WiFi Hotspot (no internet/mobile data needed).
2. Guest: Connect to the host’s hotspot.
3. Both: Open Chrome (other browsers may or may not work on Android) and navigate to:
   https://[host-phone-IP]:8443
   (Find your host’s IP in Termux with ip addr show wlan0, look for inet followed by a number like 192.168.43.1. OR, go into wifi settings on the guest phone and search for "Router IP" there.)

Step 3: Start Communication [1]

• Host: Click "Create Room" and generate a QR code (you can send the room code manually as well).
• Guest: Scan the QR code (or manually paste the room code) and you will automatically enter the room.
• Host: Click "Enter Call" and you're done!

Usage Notes

• Browser Only: Tested exclusively on Android Chrome (Brave might work 🤷).
• Hotspot Stability: Ensure the host’s hotspot is strong, range depends on device hardware and environment.
• No Background Use: Keep the Chrome tab open on both devices; closing it ends the call.

[FYI] This is a solid base. But a native app would be better instead of adding more features to this, so no further updates will be made here.

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