LMIC Node

Abstract

1. Introduction

LMIC-node is an example LoRaWAN application for a node that can be used with The Things Network. It demonstrates how to send uplink messages, how to receive downlink messages, how to implement a downlink command and it provides useful status information. With LMIC-node it is easy to get a working node quickly up and running. LMIC-node supports many popular (LoRa) development boards out of the box. It uses the Arduino framework, the LMIC LoRaWAN library and PlatformIO.

2. Objective

LMIC-node | One example to rule them all. LMIC-node is an example LoRaWAN application for a node that can be used with The Things Network. It demonstrates how to send uplink messages, how to receive downlink messages, how to implement a downlink command and it provides useful status information. With LMIC-node it is easy to get a working node quickly up and running. LMIC-node supports many popular (LoRa) development boards out of the box. It uses the Arduino framework, the LMIC LoRaWAN library and PlatformIO.

This project demonstrates how C, Arduino can be applied to a real-world Internet of Things (IoT) problem.

3. Key Features / Modules

• Send uplink messages.
• Receive downlink messages.
• Implements a downlink command.
• Provide detailed status feedback via serial port, LED and OLED display.
• Supports both OTAA and ABP activation. Simply switch via configuration option.
• LoRaWAN keys are placed in a separate file: lorawan-keys.h.
• Protection against accidentally uploading LoRaWAN keys to public Git(Hub) repositories.
• Easy to swap LoRaWAN keys for testing or for use with multiple devices.
• Requires only some configuration, but no programming or modification of source code to get it up and running.
• Configuration is done in a single project configuration file: platformio.ini.

4. Technology Stack

5. System Requirements

General requirements for this technology stack — check the README for exact versions.

• Arduino IDE / PlatformIO or a C compiler (gcc)
• Target board where applicable
• Git (to clone the repository)

6. Installation & Setup

git clone https://github.com/lnlp/LMIC-node.git
cd LMIC-node

// boardInit(InitType::Hardware) must be called at start of setup() before anything else.
bool hardwareInitSucceeded = boardInit(InitType::Hardware);

Full setup instructions are in the project README.

7. Future Enhancements

Suggested extensions you can add to make this your own project.

• Add a mobile dashboard using Blynk or Firebase
• Store readings in a cloud database for history charts
• Add alerts via SMS / Telegram when thresholds are crossed

8. Viva / Review Questions

Common questions examiners ask for projects in this domain.

1. Which microcontroller / board and sensors are used and why?
2. How does the device send data (Wi-Fi, MQTT, HTTP, Bluetooth)?
3. Where is the sensor data stored and visualised?
4. How is power consumption managed?
5. How would you secure the device and its communication?

9. Source Code & License

This project is developed by lnlp and published on GitHub under the MIT License. Please follow the license terms and credit the original author when you use or modify this code.