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GNSS LoRaWAN tracker

This repository contains a project of a tracker device, which uses GNSS to obtain location and LoRaWAN as connectivity to upload tracker messages to the cloud. This project uses Zephyr as RTOS.

Project board

Main features

The main features of this project are:

  • Obtain latitude and longitude coordinates generated by a GPS/GNSS module over UART (9600/8/N/1). All GPS/GNSS modules that use NMEA messages will do.
  • Send LoRaWAN messages (ABP mode) using Smart Modular LoRaWAN module (https://ziliatech.com/iot/), which bahaves like a modem, controlled via AT commands (9600/8/N/1).
  • Reads ignition status (on/off) and time spent with ignition on (in milisseconds)
  • Reads GNSS fix status
  • All logs messages are handled by Zephyr RTOS Logging subsystem
  • Periodically send a LoRaWAN message containing latitude (4 bytes, float format), longitude (4 bytes, float format) and a status byte. This status byte contains ignition status (on/off) at bit 0 and GNSS fix status at bit 1. The time interval between sending two consecutive LoRaWAN messages can be adjusted by CONFIG_GNSS_MANAGER_TIME_TO_SEND_LORAWAN_MESSAGE (see Kconfig for more details)

LoRaWAN credentials

Before successfully send any LoRaWAN message, you need to set LoRaWAN credentials. As this projects uses LoRaWAN in ABP mode, the following credentials must be set:

  • Device address: set this in CONFIG_LORAWAN_UART_SMARTMODULAR_DEVADDR (set Kconfig for more details)
  • Application Session Key: set this in CONFIG_LORAWAN_UART_SMARTMODULAR_APPSKEY (set Kconfig for more details)
  • Network Session Key: set this in CONFIG_LORAWAN_UART_SMARTMODULAR_NWKSKEY (set Kconfig for more details)
  • Application EUI: set this in CONFIG_LORAWAN_UART_SMARTMODULAR_APPEUI (set Kconfig for more details)

Compatible hardwares

At this moment, there are oveelays that makes it available to compile this project for the following microcontrollers:

  • ESP32 WROOM 32 (Xtensa architecture)

For ESP32 WROOM 32, wire the peripherals as described below:

  • Breathing Light (led): GPIO 18
  • Ignition switch: GPIO 4
  • GNSS module (UART 1): GPIO 25 (TX) and GPIO 26 (RX)
  • LoRaWAN module (UART 2): GPIO 23 (TX) and GPIO 5 (RX)

How to compile this project

Assuming this code is placed into zephyrproject/zephyr folder, you can compile it by doing the following:

  • For ESP32 WROOM, use the following command for compiling this project:

west build -p always -b esp32_devkitc_wroom gnss_lorawan_tracker/

And for flashing, simply use:

west flash