Explore the development and maintenance of a Zephyr-based microcontroller SDK in this informative conference talk. Gain insights into Nordic Semiconductor's journey in creating a modern, scalable Software Development Kit for nRF microcontrollers using Zephyr Project's RTOS code and tools. Discover the challenges faced, contributions made to the Zephyr Project, and the establishment of new processes within the company to collaborate with open source projects. Learn about the Vestavind team's role in coordinating interactions between projects and commercial offerings. Understand the evolution of Nordic's ICs, the software development challenges, and the decision to adopt an open-source RTOS. Delve into the structure of the nRF Connect SDK, its components, and the development model used. Explore concepts such as keeping forks clean, Zephyr modules, repository structure, and synchronization through upmerges.