Gateway

The next piece in our architecture is the Wi-Fi router. A common household Wi-Fi router will act as a gateway for us. As we have seen in Chapter 1, The World of IoT, in the Clustered devices versus standalone devices section, we are following the approach of standalone devices, where each device is self-sufficient and has a radio of its own to communicate with the outside world. All the projects we are going to build consist of a Raspberry Pi 3, which has a microprocessor as well as the radio to interface with the sensors, and actuators with the internet.