In this chapter we took the road less traveled, and by using an iTag in a nontraditional manner, we ended up building a Bluetooth Low Energy based proximity solution. Apart from the overall technical implementation, another important detail worth mentioning is the fact that we executed our code of the Android App on a Samsung Galaxy S8 device (alongside with LG Nexus 5), which is a very special device in today's market due to the fact that it is the only device that supports BLE 5 available at the time of writing. We recommend that you do run the examples presented in this book on a device that supports BLE 5, since this will help you gauge the important practical differences between the older and relatively newer BLE versions. Also, we request that you follow up both the Android and iOS examples with the homework exercises outlined in the individual sections. This will not only strengthen your overall solid grounding in Bluetooth Low Energy, but will also help with a better understanding of the topic at hand.

As we are progressing, we are slowly building our understanding of how and why Bluetooth Low Energy will impact IoT. After this chapter, we have already connected at least two distinct sensor types to the internet and made their data available to remote monitoring.

In Chapter 5, Beacons with Raspberry Pi, we shall explore an important cornerstone of Bluetooth Low Energy technology, that is, beacons. As we always do, rather than buying a premade solution and playing around with that, we shall build our own beacon from ground up using a DIY Raspberry Pi board.