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