Developed a Bluetooth enhancement for the esphome/esphome repository, focusing on improving GATT reliability for ESP32 BLE devices operating in environments with WiFi interference. The solution maintained the COEX_Bluetooth preference throughout the duration of any active BLE connection, reverting only when all connections were closed, thereby reducing connection drops and supporting more stable smart-device experiences. This work involved C++ programming and embedded systems expertise, with an emphasis on Bluetooth communication and IoT development. Collaboration with the esphome team ensured code quality and thorough review, resulting in a targeted feature that addressed reliability issues without introducing regressions or unnecessary complexity.