The following diagram is taken from https://www.kaaproject.org/overview/ and explains how Kaa works:

Kaa provides middleware for connecting hardware with enterprise applications. With Kaa's SDK, we can deploy it to most popular hardware and this SDK acts like a bidirectional secure bridge between the hardware and the application.

Not only does the middleware provide the connectivity tools, but it also provides various ways of exporting data. Now that we are aware of how Kaa works, we are going to make use of this to build our sample application.