PlatformIO Open Source October Updates
Support for the latest Zephyr RTOS, Updates for ST STM32, Nordic nRF52, Renesas RA and mbed-enabled dev-platforms
Welcome to the October 2025 updates of PlatformIO Open Source professional collaborative platform for embedded development.
This month we received a lot of helpful feedback from our community, which let us identify the most important parts of our OSS ecosystem that required our attention, so there are plenty of updates pushed in this month that we hope you will like.
During October, we released a bugfix release for PlatformIO Core, added support for the latest Zephyr framework, rolled out updates for ST STM32, Nordic nRF52 and Renesas RA development platforms, fixed a lot of issues. Some of the key highlights include:
- Zephyr RTOS v4.2.1
- ST STM32 dev-platform v19.4
- Nordic nRF52 dev-platform v10.10
- Renesas RA dev-platform v1.8
- Arduino Core for mbed-enabled devices v4.4
Zephyr RTOS v4.2.1
We’re happy to announce updated support for the latest release v4.2.1 of Zephyr Project - a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource-constrained devices, and built with safety and security in mind.
Related resources for Zephyr framework:
- Release notes for v4.2.1
- Documentation for Zephyr framework
- Supported development platforms
- Supported boards
ST STM32 dev-platform v19.4
The new release of the ST STM32 dev-platform brings support for the latest Zephyr RTOS, updated Arduino cores, new boards and dev-kits, several minor improvements:
- New boards:
WE Oceanus-I EVWE Oceanus-I Module
- Updated Zephyr to the latest v4.2.1 (release notes)
- Updated STM32 Arduino Core to the latest v2.11.0 (release notes)
- Updated Arduino-mbed core to v4.4.1 (release notes)
- Added additional escaping for the binary image path in the J-Link upload script (#864)
- Updated Zephyr variant name for BluePill boards (#865)
- Added Zephyr support for Nucleo L552ZE-Q (#861)
- Minor fixes and improvements
Related resources for the ST STM32 dev-platform:
Nordic nRF52 dev-platform v10.10
The new release of the Nordic nRF52 dev-platform brings support for the latest Arduino cores:
- Updated Adafruit Arduino Core to the latest v1.7.0 (release notes)
- Updated Arduino-mbed core to v4.4.1 (release notes)
- Minor fixes and improvements
Related resources for the Nordic nRF52 dev-platform:
Renesas RA dev-platform v1.8
The new release of the Renesas RA dev-platform v1.8.0 comes with a new board and support for the latest Arduino core:
- Added new board
Arduino Nano R4 - Updated Arduino core to v1.5.1 (release notes)
Related resources for the Renesas RA dev-platform:
Arduino Core for mbed-enabled devices v4.4
The ST STM32, Nordic nRF52 and Raspberry Pi RP2040 dev-platforms have been updated to support the latest Arduino Core for mbed-enabled devices v4.4.1. According to the release notes, v4.4.1 brings a lot of bugfixes and improvements in the core and accompanying libraries.
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