Contents Introduction
Bluetooth is a technology that was developed more than 20 years ago. It was 1994 when the first draft of data transmission that would become part of the digital modem ecosystem was presented. Nowadays, this technology is one of the pillars of the Internet of Things (IoT) [1], a perspective target that provides continuous connections among technological accessories to achieve significant impact and improved performance [2]. Bluetooth is used for data transmission through radio waves, which allows two or more devices to connect with each other. There is no limit to the type of file that can be transmitted, as such files could comprise data collected by sensors, photos, documents, music, and videos. However, the maximum range of a device equipped with Bluetooth does not usually exceed 100 m, although there are three distinct classes, according to the signal coverage range. Class 1, the most powerful category, can reach up to 100 m; Class 2, the most common category, operates only within 10 m; and Class 3 does not exceed 1 m transmission range and is also the least used category, especially recently.
