you must create a paper prototype for smart home panel your application and test it with friends$/$colleagues$,$ that is$,$ with potential users.

They can, and should, document the tests carried out with photographs, videos, etc. This documentation is used to add to the report and to draw conclusions from the tests carried out. Because it is difficult to play $3$ roles simultaneously $($Computer$/$Facilitator$/$Observer$),$ you can record the test and watch it later.

Don't forget to "not rig" the tests. They must fulfill different roles, without providing additional clues to the user. After all, this is what is being tested: is your interface sufficiently explicit and appropriate to perform the proposed tasks?