An SDP server maintains its own SDP database, which is a set of service records that describe the services the server offers.
SDP服务保持它自己的SDP数据库，一个包含服务器所提供服务的记录集。
An SDP client communicates with an SDP server using a reserved channel on an L2CAP link to find out what services are available.
SDP客户端使用L2CAP链接上的保留通道与SDP服务器通信，来发现哪些服务可用。
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