Toon Stegen
Embedded Software Engineer at Toost Solutions
Brussels, Belgium
Summary
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RockstarToon Stegen is an embedded software engineer with 12 years of hands-on experience, currently focused on Zephyr OS and wireless connectivity (BLE, WiFi) at Verhaert and freelancing through Toost Solutions. He has deep low-level expertise—adding device tree support, memory and flash integrations, and WiFi driver error handling for Zephyr on ARM STM32 platforms. Toon is an active open-source contributor, having implemented an NTP client for the PicoTCP stack and contributed hardware bring-up and documentation fixes to the flagship Zephyr RTOS. Comfortable across connectivity stacks and constrained devices, he blends systems-level coding with pragmatic testing and integration. Based in Brussels, he pairs a decade-plus of commercial projects with community-driven work that improves real-time, networked embedded systems.
12 years of coding experience
Github Skills (20)
udp10
realtime10
embedded-language10
ip10
c1110
microcontroller10
zephyr10
c1710
iot10
device-tree10
rtos10
tcp10
embedded10
stm10
modular9
Programming languages (5)
Github contributions (5)
tass-belgium/picotcp
Mar 2014 - Jun 2015
PicoTCP is a free TCP/IP stack implementation
Role in this project:
Back-end Developer
Back-end DeveloperContributions:73 commits, 3 PRs, 11 pushes in 1 year 3 months
Contributions summary:Toon primarily contributed to the development of an NTP client module for the PicoTCP project. Their work included implementing the core functionality of the client, such as sending and receiving NTP packets, parsing responses, and converting timestamps. They also added unit test stubs and addressed merge conflicts, demonstrating an active role in the module's development. Furthermore, the user integrated the NTP client into a test application.
bare-metalcortexbgpsdntcp-ip
zephyrproject-rtos/zephyr
Aug 2017 - Apr 2025
Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.
Role in this project:Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:11 reviews, 16 PRs, 47 comments in 7 years 9 months
Contributions summary:Toon Stegen's contributions primarily focus on adding support for various hardware components and improving the Zephyr RTOS's device tree definitions, specifically for ARM-based STM32 boards. He added support for QPSI flash and SDRAM on the STM32H750B-DK board, including the necessary device tree configurations. Additionally, Toon fixed a typo in the documentation and updated the dependencies for the Mac setup, showcasing his involvement in both hardware integration and documentation. He also made modifications to the NXP WiFi driver for error handling.
bluetooth-lereal-timezephyrsecuregit-repository
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