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ST Microelectronics

B-U585I-IOT02A Discovery Board​

The STM32 B-U585I-IOT02A Discovery Board is a versatile IoT development platform built around ST Micro's STM32U585AI microcontroller. This board combines ultra-low-power operation with advanced security features, making it ideal for developing IoT, wearable, and sensor applications.

Key features include:

  • Ultra-low-power processing: Arm® Cortex®-M33 processor with TrustZone® security
  • Memory:
    • Internal: 2 MB Flash, 786 KB SRAM
    • External: 512-Mbit Quad-SPI Flash, 64-Mbit Octo-SPI PSRAM, 256-Kbit I2C EEPROM
  • Wireless connectivity: Wi-Fi® (802.11 b/g/n) and Bluetooth® Low Energy
  • Rich sensor array:
    • 3D accelerometer and gyroscope
    • Temperature and humidity sensor
    • Digital barometer
    • Time-of-flight and gesture detection
  • Multiple expansion options via ARDUINO® Uno V3, STMod+, and Pmod™ connectors
  • Integrated STLINK-V3E debugger with USB connectivity

In the diagram below, you can see many of the board's physical components: Board Layout

Setup Guide​

This guide will walk you through setting up your B-U585I-IOT02A board with Atym, from initial hardware configuration to deploying your first container application. Follow each step sequentially to ensure a successful setup.

Prerequisites​

Before setting up your B-U585I-IOT02A board with Atym, ensure you have all the necessary hardware components and software tools listed below. Having everything prepared beforehand will provide a smoother setup experience and help you avoid interruptions during the process.

Hardware​

Software​

Note

Although the B-U585I-IOT02A has built-in Wi-Fi capabilities, the on-board Wi-Fi is not currently supported as there is no Zephyr driver available. Instead, the WIZnet W5500 Ethernet Shield provides the network connectivity required for your device to communicate with the Atym Hub.

Board Setup​

In this section, you'll connect the Ethernet shield to your board to enable network connectivity, which is required for communicating with the Atym Hub.

  1. Carefully connect the WIZnet W5500 Ethernet Shield to the Arduino headers on the underside of your B-U585I-IOT02A board.
  2. After that, connect the Ethernet cable to the WIZnet W5500 module.

Flashing the Atym Runtime​

This section will guide you through downloading the Atym firmware and flashing it to your B-U585I-IOT02A board using STM32CubeProgrammer.

Download the Atym Firmware​

Download

Download the latest Atym firmware image specifically built for the B-U585I-IOT02A board here.

Prepare and Erase Your Device​

Before flashing new firmware, it's important to properly erase the device:

  1. Connect the Micro USB cable to the "ST-LINK" USB port (CN8) on your board
  2. Launch STM32CubeProgrammer on your computer
  3. In the top-right (blue) dropdown menu, select "ST-LINK"
  4. Click "Connect" to establish a connection with your board
  5. Navigate to the "Erasing & Programming" section in the left sidebar
  6. Click the "Full chip erase" button in the "Erase flash memory" section in the right-hand side of the application and confirm by clicking "Ok"

Flash the Atym Firmware​

Now that your device is prepared, let's flash the Atym firmware:

  1. In the same "Erasing & Programming" section, click the blue "Browse" button, and select the Atym firmware file you downloaded earlier
  2. Click "Start Programming" to begin the flashing process
  3. Wait for the programming to complete (you'll see a success message)
  4. Click the green "Disconnect" button to safely release the connection

Verify Your Installation​

Let's confirm that the firmware was installed correctly:

  1. Open your preferred serial terminal application with these settings:

    • Port: Select your device's port
    • Baud Rate: 115200
    • Data Bits: 8
    • Parity: None
    • Flow Control: None

  2. Press the Reset Button on your board to restart the device

  3. You should see boot messages similar to this:

*** Booting Zephyr OS build v4.1.0-40-g34b526826adf ***
Copyright 2024 Atym, Inc. (build: 3151985)
Build info: dev-3151985+; 06-06-2025, 21:21Z; Kermit.local
Platform: b_u585i_iot02a

These messages indicate that the Atym runtime has successfully started on your device.

Connecting to the Atym Hub​

Setting up your device involves two main steps: first creating a device identity in the Hub, then configuring your physical device to connect using this identity.

Add Device to the Atym Hub​

This process creates a digital identity for your device in the Atym Hub. You'll perform these steps on your development computer, not on the board itself.

  1. Run the following command, replacing the values with your own (see the add device CLI reference for all available options):
atym add device --deviceName "testDevice" --description "My test device" --serialNumber "1234567890"

If successful, you’ll receive a response containing your deviceUUID and pskSecret. For example:

{
  "deviceUUID": "67c1c350-cc1c-482d-bde9-875688ff9b23",
  "pskSecret": "IEAaeWHKhYs4fAScF5ApQ0C9eGcXu123"
}

Copy both values to a secure location. You'll need these credentials to configure your device in the next steps.

  1. Retrieve your tenant ID by running:
atym show config

From the output, copy the Tenant ID value — you’ll use it together with your deviceUUID and pskSecret in the next steps.

Registering device with the Atym Hub​

Now you'll configure your board with the credentials we copied down earlier, allowing it to securely connect to the Atym Hub.

Device Console Required

The following steps must be performed ON YOUR DEVELOPMENT BOARD, not your host machine.

  1. Open a serial terminal (115200 baud, 8-N-1) connected to your device.
  2. Press the Reset Button to restart the device.
  3. You should see the command prompt atym:~$ if you're in the correct console.
  1. Set the device identity using your deviceUUID and tenantID:
atym config set device/id deviceUUID@tenantID

Replace deviceUUID and tenantID with the values you copied earlier. Make sure to include the @ symbol between them.

  1. Configure the device's pre-shared key using the pskSecret:
atym config set device/psk pskSecret
  1. Set the Atym Hub connection details:
atym config set server/endpoint coapgw.prod.atym.io
atym config set server/port 5684
  1. Verify your configuration:
atym config show

The output should display all four settings with their proper values:

Current configuration:
  device/id: a612baee-dd15-42cc-a0dc-a0783c186bb5@a60dbceb-270e-4b14-a93c-60809b34c123
  device/psk: ct6P/zFOHQbvrLyRFrnh22XnXQ1H8+at
  server/endpoint: coapgw.prod.atym.io
  server/port: 5684

  1. Reset your device by pressing the Reset Button to apply the configuration.

  2. After rebooting, your device should connect to the Atym Hub automatically. Look for the following message in your console:

Client connected.
Note

It may take 5-10 seconds between the time the device reboots and when it connects to the Atym Hub. If you're experiencing connection issues, check the Atym Hub Connection Issues troubleshooting guide for help resolving common connectivity problems.

Next Steps​

Congratulations! You've successfully completed the setup process for your B-U585I-IOT02A Discovery Board with Atym. Your device is now properly configured and connected to the Atym Hub, ready for application deployment.

To continue your journey, check out the Build and Deploy Containers guide in the sidebar. This guide will walk you through creating, building, and deploying your first containerized application to your newly set up device.