Install arduino IDE from https://www.arduino.cc/en/software . Install RAK3172 support in Arduino by following the getting started instructions from https://docs.rakwireless.com/Product-Categories/WisDuo/RAK3172-Module/Quickstart/ 

Use the C program in files to program the board after updating the DevEUI, AppEUI, AppKey values for Helium network from below step (follow instructions from RAK 3172 getting started for instructions on programming).

Register for an account in console.helium.com. Ensure you have data credits (or purchase them). Create a new device. Copy the DevEUI, AppEUI and APP Key to the C program in Arduino and program the device.

Ensure device is able to send packets to Helium network by looking at the Helium console at console.helium.com.

Create an account datacake.de. Add LoraWAN device with keys created in previous step. Use CayenneLPP as transport protocol. Add a console to display GPS position and SOS button status which are decoded from CayenneLPP message

Add Rules in datacake for sending SMS message when SOS button is activated. 

You may have to purchase SMS credits before datacake will allow you to send SMS messages