I have a course this semester about Mobile Programming using Android. One of my project that I have to achieve in this course, is a prototype which mainly consists of two parts, a smartphone and Android OS installed on it, and the other part is embedded or associated to an air-conditioner which acts as a switch to turn it on or off. The first part is simple and clear where I should build an application on the smartphone to send signal to the other part via the internet.
Our professor is asking us to search though the internet to find a good idea to design the second part of the project or find an existing appropriate solution. The second part is responsible for receiving the signal from the sender via the internet and depends on that signal it will switch the air-conditioner on or off.
So, my question is, what is the best way to design the second part? If there is product or something ready that I can use it will be perfect to use in my project, since in my course what important is to write the code in android devices rather than design a complete circuit from scratch.