RAK3172 is a LoRaWAN module based on the STM32L4 microcontroller, optimized for low-power IoT applications.

It is widely used in custom LoRaWAN boards due to its compact footprint,

low current consumption, and support for both AT command and RUI3 development modes.

This guide highlights the key design considerations for creating a custom LoRaWAN end-device circuit board for low-power IoT applications,

beginning with a basic schematic diagram of the RAK3172 LoRaWAN module and followed by an explanation of each section.