I will test the Sigfox evaluation board environment using STMicroelectronics' general-purpose 32-bit microcomputer development board, STM32 Nucleo. An expansion board equipped with an RF transceiver IC is provided, so use it.

I will now go through the downlink (sending download data) and uplink (sending upload data) settings in the device registration configuration for Sigfox.

To use the Sigfox network, you need the ID/PAC (ID number/Authentication code of the registered board) issued per board, so prepare these first.

Since it is a task kit, everything except the hardware (software, registration/communication fees) is free to use.

■ Hardware Preparation
○ Board Setup

【Supplies】
· NUCLEO-L073RZ (or NUCLEO-F401RE, etc.)
· X-NUCLEO-S2868A1 （or X-NUCLEO-S2868A2）
Expansion board for Nucleo equipped with Sub-1GHz 868MHz transceiver IC “S2-LP”
· PC (Windows 10/11)
· USB cable (USB-mini)

First, prepare two boards and connect the Arduino connectors together. In the case of the STM32 Nucleo board, it can be registered in addition to the board mentioned above. Currently, files for the Nucleo board of the STM32L0/L1/F0/F4 microcomputer are available. In addition to the board, prepare a PC and a USB cable.

■ Software Preparation
○ Sigfox DK Installation (GUI Tool)

Next, download the tools necessary for registration (to obtain an ID/PAC). The software files to be written to the board are also included in this.

Download Link: STSW-S2LP-SFX-DK

After extracting the downloaded file, run the exe file to start the installation. Since the PORT driver is also installed at the same time, proceed as is.

○ Write software files to STM32 Nucleo

When you connect the board to a PC via a USB cable, it is recognized in the format of a USB memory device named 'NODE_XXXX'. (If it is the first time, the driver is installed first)

Since the Binaries folder under the folder created during the Sigfox DK installation (usually under the “Program Files(x86)” folder on the C drive) contains various binary files for STM32 Nucleo, drag and drop them into the previously prepared “NODE_XXXX”.

By doing this, the program file is written to the STM32 microcomputer.

Example: In the case of NUCLEO-L073RZ,
'C:\Program Files (x86)\STMicroelectronics\S2-LP_SigFox_DK_x.xx\Binaries\SigFox_CLI_Demo_Project'
Complete “SIGFOX_CLI_xxxx_NUCLEO_L0.bin” inside by dragging and dropping it onto “NODE_L073RZ”.

■ Preparing the ID/PAC for the Sigfox device

Once the software is ready, obtain Sigfox ID/PAC information via ST.

○ Sigfox DK startup

First, with the board connected to the PC, launch 'S2-LP_SigFox_DK' from Windows 'Start'. (It is located in the STMicroelectronics folder.)

It is also OK to click the icon with the same name on the desktop.
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