OPC UA Message Transmission Method over CoAP
draft-wang-core-opcua-transmission-02

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Core                                                            P. Wang
Internet Draft                                                    C. Pu
Intended status: Standards Track                                H. Wang
Expires: March 11, 2018                                         Y. Yang
                                                                L. Shao
                                               C hongqing University of
                                           Posts and Telecommunications
                                                                 J. Hou
                                                    Huawei Technologies
                                                      September 7, 2017

               OPC UA Message Transmission Method over CoAP
                   draft-wang-core-opcua-transmission-02

Abstract

   OPC Unified Architecture (OPC UA) is a data exchange standard that
   provides interoperability in industrial automation. With the arrival
   of Industry 4.0, it is of great importance to implement the exchange
   of semantic information utilizing OPC UA Transmitting in CoAP. This
   document provides some transmission methods for message of OPC UA
   over CoAP.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on March 11, 2018.

Wang, et al.           Expires March 11, 2018                 [Page 1]
 Internet-Draft        OPC UA Message Transmission       September 2017

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors. All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1. Introduction ................................................ 2
      1.1. Conventions and Terminology ............................ 3
   2. Overview of OPC UA .......................................... 3
      2.1. Protocol Stack ......................................... 3
      2.2. Request/Response Model ................................. 4
   3. Specification of OPC UA over CoAP ........................... 5
   4. Transmission scheme ......................................... 6
      4.1. Proxy for OPC UA-CoAP .................................. 6
      4.2. Direct transmission .................................... 7
      4.3. REST transmission for OPC UA ........................... 8
   5. Publish subscription for OPC UA and CoAP .................... 9
   6. Security Considerations ..................................... 9
   7. IANA Considerations ......................................... 9
   8. References ................................................. 10
      8.1. Normative References .................................. 10
      8.2. Informative References ................................ 10
   Authors' Addresses ............................................ 11

1. Introduction

   Internet of things is one of the attractive applications for CoAP
   [RFC7252]. Utilizing OPC UA [IEC TR 62541-1] Transmitting over CoAP
   could meet the demand for industry 4.0 based on the exchange of
   semantic information [I-D.wang-core-opcua-transmition-requirements].
   Similar to OPC UA, CoAP message is exchanged in server/client mode.
   However, their transmission are different. Driven by this, to
   implement OPC UA Transmitting over CoAP, the major problem to be
   solved is how OPC UA packets are transmitted over CoAP. For the
   transport layer of OPC UA, the main message transmission method is
   TCP or HTTP. It is worth noting that the design of CoAP is inspired

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