Andreas Huber focused on strengthening the IPv4 network stack in the kholia/zephyr repository by addressing two targeted bugs during the month. He improved ARP protocol handling in C to ensure RFC5227-compliant address conflict detection, reducing false positives when identifying ARP probes as IP conflicts. Additionally, Andreas enhanced MQTT over WebSockets reliability by implementing robust socket closure logic, using zsock_close to maintain compatibility when POSIX_API is not configured. His work demonstrated a deep understanding of embedded systems and network programming, delivering measurable improvements in protocol correctness and system stability through precise, well-documented changes to the codebase.