BlueZ is the official Linux Bluetooth stack, and understanding its dual-mode architecture is crucial for embedded developers. This analysis breaks down how BlueZ separates BLE and classic Bluetooth code paths, from HCI layer to higher-level protocols. The article highlights key design patterns such as separate adapter interfaces, distinct GATT and L2CAP handling, and how the kernel modules coordinate. It also explains the differences in connection management, pairing, and data transfer between the two modes. For developers working on IoT devices or custom Bluetooth stacks, this source-level perspective provides practical insights into extending or debugging BlueZ. The post emphasizes the importance of understanding the underlying architecture rather than just using high-level APIs.
A source-level analysis of BlueZ's dual-mode architecture, explaining how BLE and classic Bluetooth are designed and differentiated.