In this chapter, you had a brief introduction to UPnP and how it can be used in Internet of Things applications. Apart from using the request/response pattern and web services, you now how to discover devices in the local area network and how to subscribe to events to detect changes in device states. You have also learned how to document available services and methods in interoperable documents and how such documents can be used to develop solutions where parts are interchangeable.

In the next chapter, we will introduce the CoAP protocol and see how it reduces the complexity of the HTTP protocol to be better suited for resource-constrained devices and networks.