## 1 Introduction  
The Internet of Things (IoT) rests on the premise that each and every common object may be equipped with identification, sensing and communication (networking) mechanisms. It would enable information exchange--without human intervention--between objects and also with Internet-based services, to achieve a given goal. The evolution of both the Internet and the World Wide Web, as well as all the development accomplished around consumer technologies (e.g., tablets, smartphones) ended up by defining IoT as what it is known for today: a massive network of different types of elements that interchange data. Among them and besides the usual tablets and smartphones, media players, watches, bracelets, cars, wearables, sensors, actuators, appliances, surveillance cameras and others can also be found to be a part of IoT networks [1]. Indeed, the number of applications that fall under the IoT technological umbrella have been growing so fast--in areas that include precision agriculture (e.g., [2]), security and surveillance (e.g., [3]), smart cities (e.g., [4]), and multimedia/multisensory environments (e.g., [5; 6])--that by 2020, connected elements are expected to surpass 50 billion [7; 8; 9]. A recent survey focusing IoT for multimedia [8] presents a comprehensive review on the subject, in which some architectures are referred: agent/multi-agent [10; 11], artificial intelligence [12], fog-cloud [13], as well as big data capable approaches [14] and security-based schemes [15]. In [7], an architecture for IoT multimedia (IoTMM) that brings together modern cloud services and mobile edge computing (MEC) is proposed, highlighting the importance of characteristics such as scalability, flexibility, efficiency and interoperability. IoTMM device level, IoTMM-to-cloud, IoTMM-to-MEC-to-cloud, or additional intermediate layers constitute different available options. Application and research areas are numerous. For example, in [16] traffic flow optimization was addressed resorting to cameras, ontologies and Bayesian networks. Furthermore, ocular recognition-based authentication has been reported as a suitable technology for IoT domain [17]. Within smart industry, wearable devices and Bluetooth were combined to determine visitors' position inside a museum and present cloud-based artwork information [18]. Regarding E-health, an IoT-based system to train surgeons with existing data and real-time feedback [19] is just an example among many other available solutions. Other works focusing on IoT-based user-centered multisensory approaches can be found in the literature. For example, in [6], a home entertainment system was the reference to an architecture proposal. It consists of a four-layer architecture--application, aggregation, virtualization, and physical--that intends to define templates integrating virtual objects (device properties abstraction) with Micro-Engines (i.e., tiny sensors that enable connectivity and control in all the \"things\"). Concerned with the multiplicity of sensors, actuators, and computation devices that can be found in multisensory IoT systems, in [20], a design proposal was based on service-oriented architecture for alleviating heterogeneity issues (interoperability of components, portability, scalability, etc.). Proof of concept was made with a RGB camera and smart insoles, focusing identity recognition. In the health context, a monitoring system based in blockchain, multiple sensors and multimedia big data was proposed to monitor physiological and mental states of cancer patients, with medical real-time decision support capabilities [21]. Also, the \"Magic Room\" proposed in [22] reports an IoT-based multisensory system to develop therapies for children with neurodevelopmental disorder. It consists in completely customizable environments that allow stimuli combination through \"smart\" objects control. Electrocardiogram devices, wearable sensors, location systems and machine learning have been associated to IoT to monitor patients' heart-rate while performing distinct physical activities.