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2A-Lite — Offline Emergency P2P Communication (ESP-NOW)

Repository layout

firmware/ — Arduino sketches for sender and receiver.
docs/architecture.md — system architecture and packet formats.
docs/testing.md — experimental methodology and test checklist.
docs/results.md — measured and modelled results (tables + interpretation).
figures/ — graphs (RTT vs distance, Success rate vs distance).

Quick start (for reviewers)

Flash firmware/receiver/receiver.ino to one ESP32 and power it (power bank or charger).
Flash firmware/sender/sender.ino to the other ESP32. Edit receiverMAC/senderMAC in code if needed.
Open Serial Monitor on the sender (115200) to collect CSV logs in the format: msg_id,rtt_ms,sentCount.

Key results (summary)

Distance (m)	Avg RTT (ms)	Max RTT (ms)	Success Rate (%)	Data Type
1	15.2	35	99.0	Measured
5	19.1	33	65.8	Measured
10	28.4	46	45.0	Modelled
20	38.7	61	20.0	Modelled

(Full details in docs/results.md.)

Limitations & future work

Results are for indoor, high-interference conditions (many Wi-Fi APs & hotspots).
Future work: multi-hop relaying, mesh using ESP-NOW, power consumption profiling, button/LED UI, and encryption for authentication.

Run the Project

Open firmware/receiver/receiver.ino and flash to ESP32
Power receiver (power bank or laptop)
Open firmware/sender/sender.ino, set MACs, and flash
Open Serial Monitor at 115200 to view results

License

This project is published under the MIT License. See LICENSE.

Contact: Djaman670@gmail.com