Requirements Analysis for OPC UA over CoAP
draft-wang-core-opcua-transmition-requirements-03

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Core                                                            H. Wang
Internet Draft                                                    C. Pu
Intended status: Standards Track                                P. Wang
Expires: January 16, 2019                                       Y. Yang
                                                               D. Xiong
                                                Chongqing University of
                                           Posts and Telecommunications
                                                          July 15, 2018

                Requirements Analysis for OPC UA over CoAP
             draft-wang-core-opcua-transmition-requirements-03

Abstract

   Constrained Application Protocol (CoAP) is an application protocol
   proposed for constrained nodes and constrained networks. Industrial
   Internet of Things (IIoT) is an attractive scenario for CoAP. OPC
   Unified Architecture (OPC UA) defines a semantic-based information
   model and a service-oriented architecture for IIoT, which can
   satisfy the requirements of Industry 4.0. This document analyses
   requirements for transmitting OPC UA over CoAP.

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   This Internet-Draft will expire on January 16, 2019.

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Table of Contents

   1. Introduction ................................................ 2
   2. Architecture of OPC UA over CoAP............................. 3
   3. Requirements for OPC UA over CoAP............................ 4
      3.1. Encoding ............................................... 4
      3.2. Application Sublayer Optimization....................... 4
      3.3. Consistency ............................................ 4
      3.4. Reliability ............................................ 5
      3.5. Transmission Methods.................................... 5
      3.6. Cache .................................................. 5
      3.7. Usability .............................................. 5
   4. Security Considerations...................................... 6
   5. IANA Considerations ......................................... 6
   6. References .................................................. 6
      6.1. Normative References.................................... 6
      6.2. Informative References.................................. 6
   Authors' Addresses ............................................. 8

1. Introduction

   CoAP is a web application protocol designed for resource constrained
   devices and constrained networks which has been widely used in
   machine-to-machine (M2M) communications [RFC7252].The purpose of
   applying CoAP to the Industrial Internet of Things (IIoT) is to
   provide connectivity for the devices. Whereas the communication of
   Industry 4.0 not only requires data value transmission, but also
   requires semantic information exchange. According to the definition
   of Industry 4.0 for communication, CoAP needs to support the
   exchange of semantic information, namely the semantic information
   model. For current protocols supporting semantic information model
   in the IIoT, the information model defined by OPC UA [IEC TR 62541-1]
   is very promising and its interactive model is similar to the

 Wang, et al.           Expires January 16, 2019               [Page 2]
 Internet-Draft              OPC UA Over CoAP                 July 2018