Worked on the zephyrproject-rtos/openthread repository to address a multicast routing inefficiency in mesh networks. Developed and validated a targeted fix in C++ that prevents multicast messages from being forwarded back to their source device, specifically within the mesh-forwarder logic. This patch reduced unnecessary network traffic and improved reliability for constrained devices using Zephyr-RTOS and OpenThread integration. Demonstrated expertise in embedded systems and network programming by navigating the OpenThread patch workflow and ensuring the solution was robust for real-world mesh deployments. The work focused on enhancing network efficiency and reliability without introducing new features, emphasizing careful bug resolution and system stability.