The Service Discovery Application Profile

As noted in Chapter 8, service discovery is expected to be a key component of most Bluetooth applications. Nearly all of the profiles include a service discovery element. Like the GAP, the Service Discovery Application Profile, or SDAP, provides a common and standard method for performing service discovery using the Bluetooth protocol stack.

Unlike most other profiles, the SDAP describes a standard service discovery application model and also defines abstractions of service primitives that in some respects resemble application programming interfaces (APIs). Even though the SDAP deals with the SDP middleware layer protocol and thus addresses some of the "invisible" operations described earlier, it is aimed primarily at application writers. It is the only profile with "application" in its title and the only profile to suggest API-like primitives. As explained in Chapter 8, these primitives could be mapped to platform APIs in a straightforward manner.