You have to install pip and fpdf libraries in order to use app program. You can execute the following commands:
$ sudo apt-get install python-pip
$ pip install fpdf
Then, you can run the app program:
$ python app.py
An user interface must open, like the following window:
Next step is to execute C server inside your Raspberry Pi. So you have to compile first, remember to make a cross-compilation for the device architecture:
$ make
Then execute it with a port as parameter:
$ sudo ./MyHouse <port>
Now, you can use the program successfully.