IoT Cooperation Architecture based on OCF IoTivity and CoAP Protocol

Abstract

In generally, Internet of Things refers to the networked interconnection of everyday objects, which are often equipped with ubiquitous intelligence. IoT will increase the ubiquity of the Internet by integrating every object for interaction via embedded systems, which leads to a highly distributed network of devices communicating with human beings as well as other devices. In recent years, IoT has gained much attention from researchers and practitioners from around the world. The Internet of Things (IoT) application development is a complex task that requires a wide range of expertise. Currently, the IoT development toolkit lacks support for inexperienced developers to develop IoT prototypes rapidly. Also, these systems do not consider the intelligent logic and business process. Filling this gap, a novel IoT cooperation architecture based on Business Process Modeling paradigm has been presented in this paper. The proposed IoT cooperation architecture comprises of physical cooperation network layer based on IoTivity and CoAP protocol, virtual object layer for virtualization of physical IoT devices, service logic layer for connectivity and intelligence of things, business process layer for developing process of IoT application and application layer for IoT application conceptual design. We also propose the logic object contains machine learning algorithm based elements for smart application in service logical layer. This study utilizes the existing concepts of virtual objects and service-orientation to enable end-users to configure and wire IoT service objects together to create an IoT application via simple actions like drag-n-drop and clicks etc. Through visual components, proposed system encapsulates the complexity of communicating with devices and services on the internet and abstracts them as virtual objects that are accessible through different communication technologies. In order to prove the feasibility of the proposed system, a smart indoor space prototype has been implemented for this purpose. First, we create virtual objects of physical temperature node, humidity node, wind speed node, fan node, and proxy node. Then we combine the virtual objects to generate service objects. We also implement PMV index calculation, linear regression prediction and fuzzy logic based control module through which the users are able to combine with the virtual objects to configure complex service process for indoor environment automatic control. It allows participants to use the proposed architecture for service composition and BPM based process development for the smart space prototype. Well-established open IoT technologies such as OCF IoTivity and CoAP protocol have been utilized in the proposed prototype application. The prototype has been experimentally tested in an indoor working place and the experiment results illustrate the feasibility and performance of the proposed IoT architecture.