CBU is a low power embedded Wi-Fi module developed by Tuya Smart. It is composed of a highly integrated radio-frequency identification (RFID) chip BK7231N and a few peripheral components and supports dual connection of AP and STA as well as BLE connection. For more details, please see:https://developer.tuya.com/en/docs/iot/cbu-module?id=Ka8uv3u1q1xxc