In this chapter, you have learned how to develop an ESP32 program and an Android application, and then made the two interact using the Wi-Fi protocol as a communication medium. You can use this approach to control some sensor and actuator devices on the ESP32 program over the Android application. We also learned how to build a BLE service on the ESP32 board, and how to make interactions between a ESP32 board and mobile Android device possible through BLE.
In the next chapter, we will make an ESP32 board interact with a cloud system.
