蓝牙系统L2CAP协议层分析

Analysis on L2CAP Protocol Levels of Bluetooth System

L2 CAP协议是蓝牙系统中的核心协议 ,它主要提供协议复用、分段和重组、组管理等功能。其机制转移状态有 7种 :关闭状态 ;等待同层连接响应状态 ;等待高层连接响应状态 ;配置参数状态 ;传输状态 ;等待同层断链响应状态 ;等待高层断链响应状态。给出了 L2 CAP协议层部分功能环节的简单流程。据此已研制成功了 USB Dongle,实现了两台 PC机之间的无线传输。

L2CAP is one of the core protocols in Bluetooth system, by which the functions of protocol multiplexing, segmentation, packet, reassembly and group management are provided substantially. Its mechanism has 7 transfer states, such as CLOSED, W4-L2CAP-CONNECT-RSP, W4-L2CA-CONNECT-RSP, CONFIG, OPEN, W4-L2CAP-DISCONNECT-RSP, and W4-L2CA-DISCONNECT-RSP. A simple flow chart of some of the functions of L2CAP is introduced. Based on the system, USB Dongle is developed, by which wireless transmission between 2 personal computers is realized.