flowchart LR A[1. 广播] --> B[2. 扫描] B --> C[3. 发起连接] C --> D[4. 参数协商] D --> E[5. 连接完成] style A fill:#28a745,color:#fff,stroke:#1e7e34 style B fill:#007bff,color:#fff,stroke:#0056b3 style C fill:#007bff,color:#fff,stroke:#0056b3 style D fill:#007bff,color:#fff,stroke:#0056b3 style E fill:#28a745,color:#fff,stroke:#1e7e34

sequenceDiagram participant P as 从设备 (Peripheral) participant C as 主设备 (Central) Note over P,C: 广播阶段 P->>C: ADV_IND (广播) C->>P: SCAN_REQ P->>C: SCAN_RSP (设备名称等) Note over P,C: 连接阶段 C->>P: CONNECT_IND (连接请求) P->>C: LL_CONNECTION_UPDATE Note over P,C: 数据交互 C->>P: ATT_EXCHANGE_MTU P->>C: MTU Response C->>P: GATT 数据交互

flowchart LR A[Inquiry] --> B[Page] B --> C[RFCOMM] C --> D[SDP] D --> E[连接建立] style A fill:#28a745,color:#fff,stroke:#1e7e34 style B fill:#007bff,color:#fff,stroke:#0056b3 style C fill:#007bff,color:#fff,stroke:#0056b3 style D fill:#007bff,color:#fff,stroke:#0056b3 style E fill:#28a745,color:#fff,stroke:#1e7e34

sequenceDiagram participant H as 主机 (Host) participant D as 从机 (Device) Note over H,D: 设备发现 H->>D: HCI_Inquiry D->>H: HCI_Inquiry_Result Note over H,D: 建立连接 H->>D: HCI_Create_Connection D->>H: HCI_Connection_Complete Note over H,D: L2CAP/RFCOMM H->>D: L2CAP_ConnectReq D->>H: RFCOMM_Connect Note over H,D: 数据传输 H->>D: 数据传输

// 条件：timeout > (1 + latency) * interval * 2
// 传感器：interval=1s, latency=99, timeout=10s OK
// 音频：interval=7.5ms, latency=0, timeout=500ms OK