x-obex/capability. See OBEX13.pdf, section 8.5.
“8.5.1 The Capability Object/Database
[…] The capability object contains object information such as what objects the device supports and which ones can be PUT to the inbox. It contains general-purpose information such as the devices serial number and manufacturer. It also contains a specification of service connection procedures for the various services available on a device. Such as, CONNECT Target Header values and Alternate LSAPs where the service is available.
[…]”
“8.5.3.1 Requesting the Capability Object
The capability object is requested by sending a GET request with the MIME type of the capability object provided in an OBEX Type header. The MIME type of the capability object is “x-obex/capability”. A successful response will contain one or more OBEX Body headers with the full capability object as their contents. ”
ObexConstant.Type Class | Brecham.Obex Namespace