Abstract
Internet of Things (IoT) referred to interconnected the world of things like physical devices, cars, sensors, home appliances, actuators and machines embedded with software at any time, any location. The increasing number of IoT devices facing challenges which are registration, integration, describing sensor, interoperability, semantics, security, discovery and searching. The current systems are suitable for limited number of devices. Our ecosystem change day by day which means we have billions and trillions of devices connecting to the Internet in future. One major challenge in current system is searching of suitable Smart Things from a millions or even billions number of devices in IoT. For the purpose of searching and indexing, some discovery methods and techniques are discussed and compared. Those techniques and methods are studied and find out the limitations and issued of the current system. Another challenge to searching the Smart Things is a variety of description models for describing the Smart Things. In this piece of work, a novel search engine is proposed to search the Smart Things with variety of description models. A web interface is implemented in this research with HTML, JSON and XML formats. The description models of Smart Things SensorML, SensorThings API and W3C JSON-LD are implemented in the current proposed system.
Highlights
The physical objects have the ability to connect with Internet and share data in respect of Internet of Things
Indexing of variety of description models: OGC SensorML, SensorThings API and W3C JSON-LD description models are tested in this research
SensorML uses XML technology and W3C JSON-LD uses JSON with Linked Data technology which is needed to be parsed for obtaining required data
Summary
In 2020 the connected devices that are able to communicate with Internet are more than 50.2 billion according to CISCO prediction [1] These physical objects are called Smart Things. IoT provide a range of connectivity protocols, applications and mechanisms to interoperability with existing infrastructure In this regard, it„s essential to propose a search engine to search the devices with the context of the user requests. There are some standardized sensors description technologies which are currently used in many systems These technologies are SensorML [2], SensorThings API[3] and W3C JSON-LD [4]. It is difficult as compare to searching traditional web documents because of traditional search on search limited attributes of web documents Another problem is that there is not a signal standard of describing the devices meta-data. This problem creates another challenge which is lack of describing standard for describing functionality of the devices and resource
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