We learned how to control a sensor or an actuator; for testing, we used LEDs, from an Android app through RESTful. We built RESTful using Node.js and Express. For more practices, you can build your own home automation, which can be controlled from the Internet network.
By combining your experience from all the chapters, you can build applications by utilizing a module based-LED on Raspberry Pi. We can control our program via either a wired or wireless network, such as Wi-Fi and Bluetooth. This means that you learned how to build an IoT application for Raspberry Pi.
