Offline-first disaster communication. Bluetooth RFCOMM & GAP create a secure direct link when infrastructure collapses.
For first responders & civilians in crisis situations
No servers, no internet—just direct device-to-device communication using Bluetooth technology.
Devices broadcast low-energy BLE advertising packets to find other Crisis Connect users nearby.
RFCOMM establishes a reliable serial connection between two devices for data transfer.
Messages and coordinates are encrypted with AES-GCM before transmission for complete privacy.
Pure Bluetooth infrastructure. No Wi-Fi Direct, No Hotspots, No Tethering. Just direct device-to-device communication.
Bluetooth RFCOMM sockets enable fast, low-latency 1:1 messaging and offline VoIP calls. Stable even in high-interference zones.
Built-in survival suite: Compass (Gyro+Mag), Metal Detector for rubble search, Sensor Monitor, and RSSI Signal Tracker.
Fetches coordinates via GPS sensors and transmits them over Bluetooth. Works without cellular data or downloaded map tiles.
Activate Rescue Mode to switch into high-power BLE Advertising. Broadcasts your identity and location to nearby RFCOMM nodes instantly.
Continuously scans GAP signals for other Crisis Connect nodes.
Establishes a secure 1:1 socket connection via Bluetooth Classic.
Rapidly synchronizes coordinates and status messages directly between two devices.
BLE Advertising Mode
A unique stack built solely on Bluetooth technology. No Wi-Fi Direct. No Hotspot.
Uses BLE Advertising to continuously broadcast low-energy packets for device discovery without pairing.
The primary transport layer. Establishes a serial port socket (SPP) for reliable messaging, file transfer, and voice.
Handles lightweight data exchange such as Device ID, battery level, and signal strength attributes.
End-to-End encryption with Replay Attack protection ensuring data integrity during crises.
// Crisis Connect Protocol Stack
const PROTOCOL_STACK = {
L4_SECURITY: "AES-256-GCM", // E2E Encryption
L3_STATUS: "GATT", // Device Attributes
L2_TRANSPORT: "RFCOMM/SPP", // Data Channel
L1_DISCOVERY: "BLE GAP", // Advertising
};Crisis Connect saves lives when traditional networks fail.
Phone broadcasts BLE signals even if the user is immobilized, aiding rescue teams.
Communication persists for AFAD & UMKE teams when cell towers fail completely.
Essential for campers, mountaineers, and units in areas without coverage.
Common questions about Crisis Connect and how it works.
Range varies by device and environment—typically 10-30 meters in open areas, potentially less through walls or rubble. Bluetooth is designed for short-range proximity communication.