Almost every BLE device that you will be interacting with in the real world and during the course of this book, will be a sensor that senses and stores data, waiting to be read. For example, a Fitbit senses heart rate, quality of sleep, and the number of steps walked. We will be interacting with a Fitbit device in the next chapter to understand how it stores the sensed data and how it makes that data available to us:
Figure 1: A Fitbit charge 2 device; source: www.fitbit.com
Temperature and humidity sensors can also use Bluetooth Low Energy as their communication protocol to transfer data to handheld devices or hubs. We will be creating an IoT + BLE solution for one such use case involving temperature and humidity sensors in Chapter 6, Weather Monitoring Using BLE in Warehouses:
Figure 2: Temperature and humidity sensor by Xiaomi...
