## 1 Introduction  
In recent years, the world has changed in many ways. Firstly, technology has invaded people's lives. Secondly, many people have changed their lifestyle habits to a healthier lifestyle. At the same time, in the last decade, tourism has become one of the largest economic activities worldwide. These mixed elements have led to the emergence of a new type of tourism, known as Smart Tourism (or Smart Destination), based on the intensive technology use in the tourist industry. Users connect to each other using their mobile devices (such as smartphones) so that they can look for information about what to do, when and how to do it and share information with other users. This concept is usually linked to Smart Cities, but nevertheless, Smart Tourism does not need a metropolitan environment to be deployed. As previously mentioned, nowadays, people want to live a healthier life, and these changes have been noticed not only in the way of eating, but also in the way of doing activities, moving from the classical sun and beach tourism to a more active and rural tourism. This is the main reason why the worldwide search terms rural tourism have surpassed its rival sun and beach (see Figure 1). At the same time, over the last decade, the use of mobile devices by users has escalated to such an extreme point that today, our lives without a smartphone are unthinkable. Similarly, the number of devices related to intelligent cities based on the Internet of Things (IoT) has increased drastically, surpassing 23.14 million devices today. Indeed, according to [1], in 2025, the number of IoT devices will reach 75.44 million around the world.  
In recent years, many Points Of Interest (POIs), like historical monuments, museums, a status, gardens, etc., have integrated electronic devices like, for example, Bluetooth-based ones, to offer information. Those devices, known as beacons, can be used to emit a web address Uniform Resource Locator (URL) using a Bluetooth Low Energy (BLE) signal.  
This work takes advantage of the emergence of BLE technology to propose a solution to the existing problem in tourism, consisting of a lack of information about nearby interesting locations or activities in places with no Internet coverage. Compared to a standard system based on IoT content, this Cyber Physical System (CPS) deals with a more complex system that is dynamically composed from other systems and can be used to learn from the interactions that occur to create intelligent environments. Throughout this work, an application is presented to help tourist get oriented in rural areas (such as trails), although it can also be applied to indoors. This guidance system is based on Bluetooth technology using the new FatBeacon protocol without the need for an Internet connection. For this purpose, an application based on Android systems is presented that makes use of an algorithm that indicates to the user whether he or she is on a correct route within an area. This algorithm does not indicate the best route, but it focuses on ensuring that users do not get lost.  
The present work is structured as follows: Section 2 presents the current state of the art comparing our work with previous related works. Section 3 briefly describes the main BLE-related technologies and explains how the FatBeacon protocol works. Section 4 shows a specific case study demonstrating the aim and scope of the work. Section 5 includes the algorithm and application designed for pathways, focusing on a particular case. Section 6 introduces a system that makes use of the FatBeacon protocol for gathering statistical data from users anonymously. Finally, Section 7 closes the paper with some conclusions and open problems.