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In the next few years, the W3C Web of Things (WoT) platform will represent a reference solution toward the deployment of fully interoperable systems, hence unlocking the potential of the IoT paradigm on several use-cases characterized by the current fragmentation of devices and technologies. At the same time, the worlwide adoption of the W3C WoT architecture depends on many factors, including also the availability of support tools that might facilitate the deployment of novel WoT applications or the integration with traditional IoT systems. To this purpose, the paper presents the WoT Store, a complete software platform enabling the discovery and management of W3C Things, the monitoring of its properties and events, and the invoking of actions, all within the same dashboard. In addition, the platform leverages on the semantic description of each Thing with the goal of easing and automatizing the installation and execution of WoT applications, e.g. defining the behaviour of a Thing or implementing mash-up operations from multiple Things. We sketch the main features, the architecture and the prototypal implementation of the WoT Store. Moreover, we discuss the WoT Store capabilities on three IoT use-cases, i.e. industry 4.0, smart agriculture and home automation. I. CONTEXTSince the beginning, the Internet of Things (IoT) suffered from lacks of common interaction and communication paradigms that translated into the creation of several, independent technology silos, with severe concerns on the deployment of heterogeneous systems. The interoperability can be considered both a challenge and a market opportunity: according to [1], almost 40% of the value of IoT markets can be unlocked when achieving full interoperability among heterogeneous IoT systems. Among the several research projects and standardization initiatives proposed so far and addressing the IoT interoperability issue, a key role is played by the World Wide Web Consortium (W3C), i.e. the leader of Open Web platforms, and more specifically by the Web of Things (WoT) working group [2]; this latter has been/is working on the proposal of a platform-independent API and of service discovery mechanisms for the full IoT interoperability. Clearly, a worldwide acceptance of the W3C WoT platform is fundamental for the purpose of mitigating the fragmentation of WoT-related initiatives, and of the definition of a reference solution; on the opposite, there is always the risk of a new IoT technology silo. To this purpose, it is worth remarking that the software acceptance in industrial scenarios is largely influenced by the size and the quality of its Software Ecosystem (SECO). This latter can be defined as the set of software solutions that enable, support, and automatize the activities and transactions by the actors in an associated social or business scenario. As reported in [3], several studies in the literature investigate the success of a software solution and its SECO as vehicle to attract new players. The availability of supporting software modules is acknowledged ...

In Industry 4.0 scenarios, novel applications are enabled by the capability to gather large amount of data from pervasive sensors and to process them in order to devise the "digital twin" of a physical equipment. The heterogeneity of hardware sensors, communication protocols and data formats constitutes one of the main challenge toward the large-scale adoption of the Internet of Things (IoT) paradigm on industrial environments. To this purpose, the W3C Web of Things (WoT) group is working on the definition of some reference standards intended to describe in a uniform way the software interfaces of IoT devices and services, and hence to achieve the full interoperability among different IoT components regardless of their implementation. At the same time, due also to the recent appearance of the WoT W3C draft, few testbed and real-world deployments of the W3C WoT architecture has been proposed so far in the literature. In this paper, we attempt to fill such gap by describing the realization of a WoT monitoring application of a generic indoor production site: the system is able to orchestrate the sensing operations from three heterogeneous Wireless Sensor Networks (WSNs). We describe how the components of the W3C WoT architecture have been instantiated in our scenario. Moreover, we demonstrate the possibility to decouple the mash-up policies from the network functionalities, and we evaluate the overhead introduced by the WoT approach.

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