Since earliest employment of these technologies is

Since 1982, the concept of smart network devices has gradually taken on high relevance. Indeed, the idea of automating different tasks by gathering and transmitting data captured by sensors from the environment to larger nodes has an endless number of potential real-world applications. Case in point, one of the earliest employment of these technologies is citep{cmuCoke}, which refers to the Carnegie Mellon Computer Science Department Coke Machine, the first smart network device able to report its inventory and whether if newly loaded drinks were frozen.In citep{raji1994smart} the author described the concept of the Internet of Things (IoT) as “transferring small packets of data to a large set of nodes, to integrate and automate everything from home appliances to entire factories”. In citep{xia2012internet}, the researchers state that IoT refers to the networked interconnection of daily used devices which provides smart behavior. IoT will expand the pervasiveness of the Internet by combining every daily device for interaction through embedded systems, which results in a highly dispersed network of devices interacting with human beings and different devices.Thanks to accelerated progress in technology, IoT is opening tremendous possibilities for a large number of unique applications that promise to change the quality of our lives. In recent years, IoT has gained much attention from scientists and engineers citep{raji1994smart}. IoT systems enable gadgets to be sensed or commanded remotely across the network, facilitating and allowing a more natural incorporation of the real world in computer-based systems, following in more significant performance, exactness and financial benefit, in addition to few human interventions citep{santucci2010internet}.There are several applications for IoT systems. From consumer and enterprise solutions to infrastructure applications, this class of systems can create smart devices to solve and automate a plethora of problems. For example, connecting sensor devices and transforming insights to behaviors can help to transform several services, from public transportation to healthcare devices to household appliances.IoT devices are novel in that they are concentrated on physical interfaces, enabling them to sense and respond to the environment around us. This is in contrast to previous computing paradigms, such as desktop and handheld devices, which are focused on human interfaces. These human interfaces require relatively substantial information and output mechanisms and expect the devices to be placed with their users. In contrast, through sensors, IoT systems are often remarkably miniaturized  through MEMS technology and transfer out information over wired or wireless interfaces to mobile and cloud devices. This enables the placement of IoT devices in a myrad of new places and applications where computing was  previously absent citep{blaauw2014iot}.A case in point of places where computers were previously absent are devices that could collect data and manage actions in environments like natural ecosystems to buildings and factories. All of these applications make IoT systems the fast growing application space, poised to convert the largest electronics market for the semiconductor shareholders citep{blaauw2014iot}.Recently, a sector that has been benefiting from IoT systems and in general from wearable smart devices is the medical and healthcare domain. Pedometers are useful for tracking ambulatory physical activity in clinical populations, and those that display steps or calories are useful in motivating patients to increase their activity levels. Furthermore, sensor-based measurement of human activities can provide a quantitative assessment of physical activity. Monitoring this activity using accelerometry methods facilitates automatic, constant, and long-term motion analysis of objects in a free setting citep{yang}.

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