Summary for 2025-09: Delivered a focused enhancement to the Modbus Serial Driver in Zephyr (zephyrproject-rtos/zephyr) to improve data integrity at high UART speeds. Key feature: Modbus Serial Driver UART ASYNC API enhancement, enabling UART ASYNC API support to prevent data loss on high-speed links and on NRF platforms. A new Kconfig option was added to control the asynchronous behavior, and the serial driver refactor enables robust operation under high-throughput conditions. Commit associated with this work: b27ab80d20f46c7618917583f6e6389918d59d99. Major bugs fixed: None recorded for this scope in September 2025 data provided. Overall impact and accomplishments: Enhances reliability and throughput for industrial-grade Modbus deployments by reducing data loss risk at high speeds, improves platform robustness for NRF hardware, and provides configurable control via Kconfig. This strengthens Zephyr’s Modbus storytelling for customers operating high-speed communication channels and helps meet performance targets in industrial automation. Technologies/skills demonstrated: C, firmware/kernel driver development, asynchronous I/O patterns (UART ASYNC API), Modbus protocol integration, Kconfig-based configurability, NRF platform considerations, and Git-based change management with focused, traceable commits.