lifelink

When Networks Fail, Communication Shouldn’t

Created on 13th September 2025

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No Internet, No Help – most SOS apps stop working offline.

Wasted Time – emergencies need instant alerts, not delays.

No Backup Route – messages can’t hop through nearby devices.

Lives at Risk – when every second counts, help never arrives.

Offline Message Forwarding
- Hurdle: Implementing reliable Bluetooth/Wi-Fi Direct communication was tricky, as devices often disconnected or required manual pairing.
- Solution: Added a fallback mechanism and auto-retry logic so messages would keep attempting until one device with internet was found.
Permission Management
- Hurdle: Android required multiple runtime permissions (Location, Bluetooth, Internet), and forgetting one caused crashes.
- Solution: Implemented a centralized permission manager to request and check all required permissions at once.
Data Packaging
- Hurdle: Combining profile info, GPS, battery %, and timestamp into a single SOS payload without errors.
- Solution: Created a structured JSON model so data is always consistent and easy to send.
UI Simplicity vs. Features
- Hurdle: Balancing a minimal interface with critical emergency details.
- Solution: Designed a clean main screen with a single large SOS button and moved extra settings into the Profile page.

Technologies used

JavaScript

Kotlin

Bluetooth Module