May 2026 focused on hardware integration, subsystem maturation, and backbone improvements that boost board interactivity, reliability, and developer productivity. Highlights include wiring and enabling onboard peripherals for Nesso N1, maturing the buzzer subsystem for multi-board use, hardening the LoRaWAN stack, and advancing runtime architecture for safer, centralized state management. The work delivers tangible business value via improved user experiences, more robust radio behavior, and faster, safer API usage across platforms.

In April 2026, the nxp-upstream/zephyr syscon subsystem was hardened with concurrency-safe access and robust error handling, accompanied by API documentation improvements and broader maintenance/CI enhancements. Key changes include per-device spinlocks, atomic update_bits, misaligned access rejection with tests, Doxygen-style API docs, and expanded maintenance/CI coverage to improve long-term stability.

For 2026-03, the Zephyr LoRa/SX126x efforts delivered high-value features, reliability fixes, and memory/power optimizations across the nxp-upstream/zephyr repository. CAD for LoRa API enables pre-transmission channel checks; RX duty cycle (wake-on-radio) support and sample simplify low-power operation; TX path fix improves transmission reliability; SX126x power management reduces standby current; ARM64 MMIO/device MMIO modernization streamlines memory mapping and reduces board-specific config. Overall, these changes improve deployment reliability, battery life, and cross-board maintainability, while demonstrating strong C/embedded firmware, interrupt handling, and ARM64 memory management skills.

February 2026 highlights: Delivered key SX126x driver enhancements across Zephyr repos, enabling modular HAL, STM32WL sub-GHz radio support, and build/test coverage for WL55JC. Implemented rigorous SPI transfer fixes and RX callback improvements for reliability. Introduced sleep-mode power management with a configurable option to balance power and responsiveness. These updates broaden hardware compatibility, improve reliability, and reduce power consumption, delivering tangible business value for multi-platform LoRa deployments.

January 2026 monthly summary: Delivered foundational LoRaWAN backend modularization and multi-backend support, enabling backend-agnostic deployment and easier integration of future backends. Implemented architecture changes across the nrfconnect/sdk-zephyr and prepared the ground for a standalone emulator backend, including directory restructuring and naming alignment. Modernized the LoRaWAN module to improve build safety and consistency, and localized configuration to avoid global option conflicts. Added a native SX126x driver with accompanying build tests to decouple from external backends, enhancing driver portability and testing coverage. Fixed a critical bandwidth enum translation bug to prevent crashes in loramac-node, improving runtime reliability. Strengthened testing and documentation through backend-agnostic NVM region handling and explicit backend NONE usage for native builds. Technologies demonstrated include Zephyr RTOS, CMake-based builds, Kconfig collaboration, modular backend design, and native driver development for LoRa with expanded test coverage.

December 2025 (nrfconnect/sdk-zephyr) delivered major LoRa/LBM integration improvements with clear business value: external event notifications, flexible startup control, and HAL readiness for LoRa Basics Modem in Zephyr. Key outcomes include: - GPIO callback API for DIO1 interrupts in LBM LoRa devices: added user callbacks for DIO1, with automatic pin-mask configuration from devicetree to enable external notifications. Commit: c6b369e1a31a50175e17ebc5c9d2a7e47195f07d. - Deferred radio initialization for configurable startup: split device init into boot-time and first-config phases; radio init is triggered on first lora_config(), giving applications full control before activation. Commit: 54d4cdc8979554969e4d5c40f7b215739f1a2643. - HAL groundwork for LoRa Basics Modem in Zephyr: CMake refactor and HAL stubs to enable linking; initial smtc_modem_hal implementation with porting tests; remaining HAL stubs to unblock linking. Commits: ca0703f9e64a0f6b6ff8f2c393475e88375d086c; a4dbdba2e7b4f57ec42981e99870faa6b486da85; 89b097428da3a7ae533c6403f2f2f0cd038ae236.