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OPC UA message transmission method based on CoAP for resource-constrained industrial field equipment

Active Publication Date: 2019-04-26
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] The present invention aims at the problem that the data of resource-limited industrial field devices cannot be uniformly described and cannot be uniformly accessed, and also meets the needs of industrial field devices to access Web services, and designs a CoAP-based OPC UA suitable for underlying devices Message transmission method

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  • OPC UA message transmission method based on CoAP for resource-constrained industrial field equipment
  • OPC UA message transmission method based on CoAP for resource-constrained industrial field equipment
  • OPC UA message transmission method based on CoAP for resource-constrained industrial field equipment

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Embodiment Construction

[0023] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] figure 1 It is the communication protocol stack designed by the preferred embodiment of the present invention; the communication protocol stack mainly includes: OPCUA, secure channel, and CoAP to form the application layer protocol family. Among them, OPC UA can be encoded in UA binary or XML encoding format according to the application scenario.

[0025] figure 2 It is the UA-CoAP server designed by the preferred embodiment of the present invention; the main function of the UA-CoAP server is: receive the underlying data and construct the OPC UA information model, encapsulate it into the load of the standard CoAP data message after encoding, and send the query request The frame queries whether the proxy conversion server exists.

[0026] image 3 It is the UA-CoAP data message header designed by the preferred embodiment of the p...

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Abstract

The invention relates to an OPC UA message transmission method based on CoAP for resource-constrained industrial field equipment, and belongs to the technical field of industrial communication. The method comprises the following steps: encapsulating and encoding data with an OPC UA information model, re-encapsulating the entire OPC UA data message into a load part of a CoAP message, and then querying whether a HTTP-to-CoAP proxy server exists in a network based on a UA-CoAP server; and if so, sending the UA-CoAP data message to the HTTP-to-CoAP proxy server, converting the received data message into a HTTP protocol and sending the HTTP protocol to an OPCUA client. Through adoption of the method, the problem that data of the resource-constrained industrial field equipment cannot be uniformly described and cannot be uniformly accessed is solved, and meanwhile the demand of the industrial field equipment for accessing Web services is met.

Description

technical field [0001] The invention belongs to the technical field of industrial communication, and relates to a CoAP-based OPC UA message transmission method suitable for resource-limited industrial field devices. Background technique [0002] Constrained Application Protocol (CoAP) is a web transmission protocol proposed by The Internet Engineering Task Force (IETF) in 2014 for resource-constrained nodes and networks in the Internet of Things. Its emergence provides a solution with low power consumption, high security, and scalability for networks with resource-constrained nodes. [0003] OPC Unified Architecture (OPC Unified Architecture, OPC UA) is a key technology released by the OPC Foundation in 2006 to solve the problem of data interconnection and interoperability in multi-protocol networks. In addition to seamless data transmission, OPC UA also has the characteristics of building information models, secure and platform-independent communication, etc. It provides a...

Claims

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Application Information

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IPC IPC(8): H04L12/24
CPCH04L41/0226H04L41/0246H04L67/12H04L67/565H04L69/08
Inventor 王平吴俊锐蒲宬亘王仪
Owner CHONGQING UNIV OF POSTS & TELECOMM
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