Looking at a number of IoT/WoT systems I can see that it is common to build the concept on the IETF "Low Power" stack, i.e. : Application layer: CoAP Transport layer: DTLS, UDP Network layer: IPv6, 6LoWPAN Physical layer: IEEE 802.15.4
This means that an IoT device has a unique IPv6 address and a service on the device can be exposed through a unique persistent URL and a REST API, which is usable by both native and Web Apps.
I have seen that a "Gateway Agent" will be included in the next release of AllJoyn. Which functionality will be included in this gateway. Will for example it be possible to expose REST APIs to AllJoyn enabled services on devices so that they will be accessible by Web Apps?
Now there is also a mapping of the CoAP-based "Low Power Stack" towards Bluetooth Low Energy, https://www.bluetooth.org/docman/handlers/DownloadDoc.ashx?doc_id=296307 .