Service Discovery protocol(SDP)

locating services provided by

Volume 3 , Part C , section 8

2.1sdp client-server architecture

2.2 service record -- shall only be a list of ervice attributes.

2.3 service attribute : each descr a signle characteristic of a service.

　　service id

　　provider name

　　service name

---------service attribute---------

　　| attribute id  |

　　| attribute value |

---------------------------------

　　attribute id : a 16 bit unsigned integer that distiguigh each attribute from other attribute within a service record.(only in each service class)

attribute value: data element

2.4 service class  : each service is an instance of a service class.

　　ServiceClassIDList is very important

2.5 Searching for services

once a SDP client has a service record handle, it request values of specific attributes.

　　uuid universally unique identifier that is guaranteed to be unique across space and time.

　　service search patterns

　　binder

蓝牙数据包日志在 /storage/emulated/legacy/btsnoop_hci.log