Wireless sensor networks have been a driving force of the Industrial Internetof Things (IIoT) advancement in the process control and manufacturing industry.The emergence of IIoT opens great potential for the ubiquitous field deviceconnectivity and manageability with an integrated and standardized architecturefrom low-level device operations to high-level data-centric applicationinteractions. This technological development requires software definability inthe key architectural elements of IIoT, including wireless field devices, IIoTgateways, network infrastructure, and IIoT sensor cloud services. In thispaper, a novel software-defined IIoT (SD-IIoT) is proposed in order to solveessential challenges in a holistic IIoT system, such as reliability, security,timeliness scalability, and quality of service (QoS). A new IIoT systemarchitecture is proposed based on the latest networking technologies such asWirelessHART, WebSocket, IETF constrained application protocol (CoAP) andsoftware-defined networking (SDN). A new scheme based on CoAP and SDN isproposed to solve the QoS issues. Computer experiments in a case study areimplemented to show the effectiveness of the proposed system architecture.
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