During October 2025, Chen Jianxing focused on enhancing the reliability of Wi-Fi transmissions in the espressif/esp32-wifi-lib repository. He addressed a critical issue in the ESP32 Wi-Fi stack by implementing a fix that ensures the MAC transmission process reliably terminates by setting the TX frame ACK bit, reducing unnecessary retransmissions across multiple ESP32 variants. This work required low-level debugging and precise bitwise manipulation in embedded C and C++, aligning closely with ESP32 hardware behavior. By validating the solution across different hardware versions, Chen improved cross-device connectivity and demonstrated depth in embedded systems and firmware development for production environments.