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This section of the Bluetooth Specification defines the Logical Link Control and Adaptation Layer Protocol, referred to as L2CAP. L2CAP provides connection- oriented and connectionless data services to upper layer protocols with protocol multiplexing capability and segmentation and reassembly operation.
l2cap为上层提供了面向连接和无连接的服务数据及其复用能力，分段和重组操作.
L2CAP permits higher level protocols and applications to transmit and receive upper layer data packets (L2CAP Service Data Units, SDU) up to 64 kilobytes in length. L2CAP also permits per-channel flow control and retransmission.
l2cap允许高层协议和应用程序去发送和接收高达64K 字节，同时也允许每个channel进行流程控制和重传.
The L2CAP layer provides logical channels, named L2CAP channels, which are multiplexed over one or more logical links.
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