Graduation Thesis · IZU 2025

NEMESIS

Encrypted Mesh Network

An infrastructure-independent, end-to-end encrypted LoRa mesh communication system built from the ground up. Custom PCB design, embedded C++ firmware, Flutter mobile app, and a Rust-powered Ground Control Station.

340m Max Range

AES-128 Encryption

0% Loss at 190m LoS

Explore Hardware View Results

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// What is NEMESIS

Off-grid. Encrypted.
Self-healing.

NEMESIS is a fully custom-engineered mesh communication system for scenarios where cellular infrastructure is absent or untrusted — disaster relief, field operations, and remote monitoring.

Custom PCB integrating ESP32-WROVER-E and Ebyte E22 LoRa module, fabricated and assembled from scratch.
AES-128 encryption embedded at firmware level — every byte is encrypted before RF transmission.
Self-healing mesh topology with AODV-inspired routing: nodes auto-discover peers and reroute around failures.
Flutter mobile app connects over Wi-Fi/TCP; Rust-based GCS monitors the entire network in real time.

📱

Mobile
Node

📡

Relay
Node

🖥️

Ground
Control

Encryption Pipeline

Plaintext → AES-128 → LoRa RF → AES-128 → Plaintext

İstanbul Sabahattin Zaim Üniversitesi Mühendislik ve Doğa Bilimleri Fakültesi Software Engineering · 030720126

// Hardware

System Components

Every component was designed, fabricated, and integrated by the project team. Select a component to explore it in interactive 3D.

📱

Mobile Node Unit

Custom 3D-printed PLA housing that mounts directly onto a smartphone. Turns any mobile device into a fully functional encrypted mesh node.

🖥️

Ground Control Station

Ruggedized chassis housing a LattePanda 3 Delta SBC and integrated display. Features a physical key-switch mechanism for secure power-on authorization.

📦

Field Node Enclosure

Industrial-grade enclosure from Altınkaya, precision-machined to fit the custom PCB with antenna and connector pass-throughs for field deployment.

⚙️

Internal Assembly

Internal mounting chassis with the custom ESP32 + Ebyte E22 PCB installed. Designed for component stability and thermal management in field conditions.

// Technology

Full-Stack Engineering

NEMESIS spans four engineering layers — from bare-metal PCB design to a cross-platform mobile UI — all built and integrated by the project team.

Hardware Layer

ESP32-WROVER-E MCU

Ebyte E22 LoRa Module RF · 868 MHz

Custom PCB Design & Fabrication PCB

LattePanda 3 Delta SBC GCS Host

3 dBi SMA Antenna Antenna

Embedded Firmware

C++ / FreeRTOS Runtime

AES-128 Encryption Security

Custom AODV Mesh Routing Protocol

Flood Prevention (Packet ID) Anti-loop

Dynamic SF/BW LoRa Drivers Driver

Mobile Application

Flutter (iOS & Android) Framework

TCP Socket to Node Transport

Wi-Fi AP / Station Mode Connectivity

Auto-reconnect State Management Resilience

Messaging UI with Delivery Status UX

Ground Control Station

Rust Programming Language Language

Ratatui Terminal UI UI Framework

Real-time RSSI / SNR Graphs Telemetry

Live Packet Log Feed Monitoring

Zero-overhead Memory Safety Reliability

// Field Tests

Performance Results

Field tests conducted on 17.12.2025 at IZU Campus — 7 test positions, clear sky, 13°C. NEMESIS V1 hardware with firmware v0.0.5.

Packet Loss
190m Line of Sight

340m

Max Reliable
Range

Test Positions
IZU Campus

−75

dBm Practical
RSSI Threshold

Pos	Distance	Condition	Obstruction	Packet Loss	RSSI
P1	55 m	🟢 LoS	None	0 %	−64.75 dBm
P2	125 m	🟢 LoS	None	0 %	−70.25 dBm
P3	190 m	🟢 LoS	None	0 %	−71.75 dBm
P4	210 m	🔴 NLoS	High — Campus Buildings	100 %	N/A
P5	291 m	🔴 NLoS	High — Campus Buildings	100 %	N/A
P6	340 m	🟡 NLoS	Low	0 %	−75.00 dBm
P7	310 m	🟡 NLoS	Low	50 %	−75.00 dBm

Key Insight — NLoS failures at P4/P5 are attributed to >15 dB shadow fading from dense concrete structures, not distance. Upgrading from 3 dBi to a 5–8 dBi SMA antenna is the primary recommended improvement to extend NLoS coverage.

// Team

Project Team

Developed as a graduation thesis at İstanbul Sabahattin Zaim Üniversitesi, Faculty of Engineering and Natural Sciences, 2025.

Nouman NTELI IMPRAIM

Project Lead · Developer

Software Engineering student (ID: 030720126) — responsible for hardware design, PCB fabrication, embedded firmware, Flutter mobile app, and Rust GCS development.

ŞB

Dr. Şengül BAYRAK

Project Advisor