CN108183967B - OPC UA (optical proximity correction) publishing/subscribing method suitable for IPv6 wireless sensor network - Google Patents
OPC UA (optical proximity correction) publishing/subscribing method suitable for IPv6 wireless sensor network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L67/00—Network arrangements or protocols for supporting network services or applications
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- H—ELECTRICITY
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Abstract
The invention relates to an OPC UA publishing/subscribing method suitable for an IPv6 wireless sensor network, belonging to the technical field of wireless sensor networks. The method takes a border gateway in the IPv6 wireless sensor network as a message forwarding agent, and enables the agent to have the function of message filtering based on a message Queue (Queue) and a message producer (WriterId). In addition, the agent also has the functions of resource discovery and fault tolerance, and can respond to the resource discovery request of the subscriber and the wrong subscription request. The invention enables the releasing/subscribing method of the OPC UA protocol to be applicable to the IPv6 wireless sensor network, saves the energy of a publisher and a subscriber and reduces the load of the network.
Description
Technical Field
The invention belongs to the technical field of wireless sensor networks, and relates to an OPC UA (optical proximity correction) publishing/subscribing method suitable for an IPv6 wireless sensor network.
Background
The IPv6 wireless sensor network applies the IPv6 technology to the wireless sensor network to realize the full IP of the sensor nodes, so that the sensor nodes in the network can be seamlessly connected with the existing IP network. This type of network generally has a central control architecture, and uses a border router (or border gateway) to manage nodes in the network and to converge and forward node data. The resources of the border router (or border gateway) are generally rich, while the nodes generally have the characteristics of limited resources and limited energy, and some technologies currently used in the wired IP network are generally required to be adapted to the IPv6 wireless sensor network.
The OPC UA protocol defines a uniform information model, can solve the problem of interoperability of protocols in an IPv6 wireless sensor network, and a publish/subscribe mode is a common communication mechanism in an IPv6 wireless sensor network, so that the publish/subscribe method of the OPCUA protocol is applied to an IPv6 wireless sensor network scene and has important significance. In an actual IPv6 wireless sensor network scenario, publishers and subscribers in a publish/subscribe mechanism are all IPv6 sensor nodes with limited resources and limited energy, and often use batteries to supply power to the nodes, and data communication between the nodes is a main part of energy consumption.
Currently, the OPC foundation has defined a specification of publish/subscribe patterns, in which two methods are defined. The first method utilizes multicast of UDP protocol to realize the forwarding of message, both the publisher and the subscriber join a group of UDP multicast, when there is message published, the subscribers of the group can receive the message; the second method uses the agent of the third party protocol to realize the message forwarding, such as AMQP or MQTT, when the message is published, the publisher sends the message to the agent as the load of the third party protocol, and the agent forwards the message to the subscriber. Both methods are designed based on a wired IP network, and an IPv6 wireless sensor network scene is considered, the traditional UDP multicast method needs the support of a multicast protocol and is difficult to be directly applied in the wireless scene, and the method of using the agent of a third-party protocol as the middleware for message forwarding increases the packet sending quantity of nodes because the agent can only forward the message according to the message head, which is not beneficial to saving energy of the nodes and reducing network cost. In view of this, both methods in publish/subscribe mode proposed by the OPC foundation are difficult to be directly applied to IPv6 wireless sensor networks. Therefore, the invention provides an OPC UA publish/subscribe method suitable for an IPv6 wireless sensor network, and aims to save energy of nodes and reduce network load on the premise of maintaining functions of the OPC UA publish/subscribe method.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an OPC UA publish/subscribe method suitable for an IPv6 wireless sensor network, in which a border router (or border gateway) in an IPv6 wireless sensor network is used as a proxy for message forwarding, a function of filtering messages based on a message Queue (Queue) and a message producer (WriterId) is added to the border router (or border gateway), and the IPv6 protocol and the wireless protocol are adapted by using 6L wpan technology, and meanwhile, the proxy can support resource discovery and fault tolerance functions, reduce the number of packets sent by a publisher, simplify the steps of processing data packets by a subscriber, save node energy, and reduce network overhead.
In order to achieve the purpose, the invention provides the following technical scheme:
the OPC UA publishing/subscribing method applicable to the IPv6 wireless sensor network comprises the following steps of:
s1: a publisher sends a message to be published to a boundary router, and the boundary router receives the message and establishes a published message queue list and a message producer list corresponding to each message queue;
s2: a subscriber sends a message needing subscription to a boundary router, and the boundary router marks a message queue needing subscription and a corresponding message producer by using the address of the subscriber;
s3: the publisher sends a new message to the border router, and the border router finds a corresponding message queue in the message queue list by using the message queue in the message;
s4: the boundary router finds out the message producer needing subscription for each subscriber needing subscription to the current message queue, reserves the message load corresponding to the message producer needing subscription in the current message, and discards the message load corresponding to the producer not needing subscription;
s5: the border router sends the filtered message to the subscriber;
s6: and the subscriber receives the filtered message forwarded by the border router and analyzes the message.
Further, the messages issued by the publishers compress UDP protocol headers and IPv6 protocol headers by using 6L oWPAN technology to adapt to wireless scenarios, each message corresponds to only one message queue, and each message queue comprises a plurality of message producers.
Further, when the border router receives a message issued by a publisher, it first searches whether a queue of the message exists, if not, adds the queue in the queue list, and adds a producer corresponding to the queue to the producer list of the queue.
Further, when the border router receives a message published by a publisher and the queue of the message exists in the message queue list of the border router, all subscribers subscribing to the message are found, message loads are filtered according to different producers of the message queue to which each subscriber needs to subscribe, message loads corresponding to message producers which are not subscribed are discarded, and meanwhile, producers which are not included in the current message queue producer list in the message are added into the list.
Further, the border router supports the resource discovery and fault tolerance functions, and returns the current existing message queue and the corresponding message producer to the subscriber after receiving the resource discovery request message sent by the subscriber; and when the subscription information sent by the subscriber does not exist, returning error information to the subscriber.
The invention has the beneficial effects that:
(1) the OPC UA publishing/subscribing method applicable to the IPv6 wireless sensor network provided by the invention realizes message forwarding by using a boundary router (or a boundary gateway) in the IPv6 wireless sensor network as an agent, simplifies the network structure, avoids introducing a third party protocol, and solves the problems that the traditional OPC UA publishing/subscribing mode UDP multicast is difficult to be directly applicable to the IPv6 wireless sensor network and the network overhead is increased and the node energy is wasted by introducing the third party protocol.
(2) Compared with the traditional OPC UA message forwarding, the OPC UA publishing/subscribing method applicable to the IPv6 wireless sensor network provided by the invention has the advantage that when the message reaches the proxy, the proxy can filter the message by using the message queue subscribed by the subscriber and the message producer. In this way, the number of packages sent by the publisher can be reduced, and the processing steps of the data packages can be simplified by the subscriber, so that the energy of the publisher and the subscriber is saved, and the network overhead is reduced.
(3) According to the requirement of establishing the publish/subscribe relationship according to the OPC UA protocol publish/subscribe mode, the invention can support the resource discovery of the subscriber to the subscription information, and meanwhile, when the information subscribed by the subscriber does not exist, the proxy can respond error information to the subscriber.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a flowchart of a method for issuing/subscribing OPC UA protocol in accordance with the present invention;
FIG. 2 is a diagram of an application scenario of the OPC UA protocol publish/subscribe method according to the present invention;
FIG. 3 is a list of message queues (Queue) in the agent and a list of message producers (WriterId) and a map of subscriber addresses;
FIG. 4 is a flow chart of the proxy responding to subscriber resource discovery and mis-subscription information.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Aiming at the defects of the existing OPC UA publishing/subscribing method, the structural characteristics of the IPv6 wireless sensor network are considered, a boundary router (or a boundary gateway) in the IPv6 wireless sensor network is used as a proxy for message forwarding, and an IPv6 sensor node is used as a publisher or a subscriber. The message filtering function based on a message Queue (Queue) and a message producer (WriterId) is added to the agent, and the resource discovery and fault tolerance functions can be supported. Fig. 1 is a flowchart of an OPC UA publish/subscribe method according to the present invention. The method provided by the invention is concretely implemented as follows:
fig. 2 is a diagram of an application scenario of an OPC UA protocol publish/subscribe method. The IPv6 wireless sensor network is taken as a specific embodiment of the method, and the communication entities comprise publishers, proxies and subscribers. Any node in the sensor network acts as a publisher or subscriber and the border router (or border gateway) acts as a proxy for message forwarding. The method comprises the following specific steps:
step 1: a publisher publishes data information to be published to an agent, and the agent receives the information of the publisher;
step 2: the broker builds a list of published message queues and a list of producers corresponding to each message queue.
Step 3: the subscriber sends a message needing subscription to the agent, and the agent marks the message queue needing subscription and the corresponding producer by using the subscriber address.
Step 4: the publisher publishes a new message, the agent determines the subscribers who need to subscribe the message according to the message queue in the message, filters the load corresponding to the producer who does not need to subscribe for each subscriber, and reserves the load corresponding to the producer who needs to subscribe.
Step 5: the proxy sends the filtered message to the subscriber.
Step 6: and the subscriber receives the filtered message forwarded by the proxy and analyzes the message.
Fig. 3 is a mapping diagram of a message queue list, a message producer list, and a subscriber address, and the specific mapping relationship is as follows:
when a publisher issues a message to an agent, the agent first judges whether the message queue exists in the agent according to the message queue in the message, if not, the message queue is added to a message queue list of the agent, and if so, the message is filtered.
The agent is provided with a plurality of message queues, each message queue is provided with a plurality of message producers, and after the subscriber sends the information needing subscription to the agent, the agent marks the message queue needing subscription and the message producer needing subscription in the current message queue by using the subscriber address.
FIG. 4 is a flowchart of an agent responding to subscriber resource discovery and mis-subscription information, comprising the following steps:
step 1: a subscriber sends a resource discovery request to an agent;
step 2: the agent returns the published message queues and the message producer lists corresponding to each queue to the subscriber;
step 3: a subscriber sends a nonexistent message queue or a message producer subscription request to an agent;
step 4: the proxy returns an error message to the subscriber.
The invention takes a border router (or a border gateway) as a proxy, and the method for forwarding the message by the proxy based on the message Queue (Queue) and the message producer (WriterId) is not only suitable for the IPv6 wireless sensor network, but also suitable for the OPCUA publish/subscribe communication mode of other networks.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. The OPC UA publishing/subscribing method applicable to the IPv6 wireless sensor network, wherein the OPC UA represents an object connection and embedding unified framework for process control, and is characterized in that: the method comprises the following steps:
s1: a publisher sends a message to be published to a boundary router, and the boundary router receives the message and establishes a published message queue list and a message producer list corresponding to each message queue;
s2: a subscriber sends a message needing subscription to a boundary router, and the boundary router marks a message queue needing subscription and a corresponding message producer by using the address of the subscriber;
s3: the publisher sends a new message to the border router, and the border router finds a corresponding message queue in the message queue list by using the message queue in the message;
s4: the boundary router finds out the message producer needing subscription for each subscriber needing subscription to the current message queue, reserves the message load corresponding to the message producer needing subscription in the current message, and discards the message load corresponding to the producer not needing subscription;
s5: the border router sends the filtered message to the subscriber;
s6: and the subscriber receives the filtered message forwarded by the border router and analyzes the message.
2. The OPC UA publish/subscribe method for IPv6 wireless sensor network according to claim 1, wherein the messages published by publishers use 6L oWPAN technology to compress UDP protocol headers and IPv6 protocol headers to adapt to wireless scenarios, each message corresponds to only one message queue, and each message queue contains multiple message producers.
3. The OPC UA publishing/subscribing method applicable to IPv6 wireless sensor network according to claim 1, wherein: when the border router receives a message issued by a publisher, the border router firstly searches whether a queue of the message exists, if the queue does not exist, the queue is added into a queue list, and a producer corresponding to the queue is added into the producer list of the queue.
4. The OPC UA publishing/subscribing method applicable to IPv6 wireless sensor network according to claim 1, wherein: when the border router receives a message published by a publisher and the queue of the message exists in the message queue list of the border router, all subscribers subscribing to the message are found, message loads are filtered according to different producers of the message queue to which each subscriber needs to subscribe, the message loads corresponding to message producers not subscribed are discarded, and meanwhile, producers not included in the current message queue producer list in the message are added into the list.
5. The OPC UA publishing/subscribing method applicable to IPv6 wireless sensor network according to claim 1, wherein: the boundary router supports the resource discovery and fault tolerance functions, and returns the current existing message queue and the corresponding message producer to the subscriber after receiving a resource discovery request message sent by the subscriber; and when the subscription information sent by the subscriber does not exist, returning error information to the subscriber.
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| CN109739816B (en) * | 2018-10-12 | 2020-06-19 | 比亚迪股份有限公司 | Data storage method and device of comprehensive monitoring system based on rail transit |
| MX2021006828A (en) * | 2018-12-13 | 2021-07-02 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Subscription message processing method and apparatus, and computer device and storage medium. |
| CN111142487A (en) * | 2019-12-30 | 2020-05-12 | 浪潮通用软件有限公司 | Equipment data acquisition system based on OPC UA unified architecture protocol |
| CN113542314B (en) * | 2020-04-13 | 2022-07-08 | 烽火通信科技股份有限公司 | Method and system for realizing subscription mode based on keyword filtering |
| CN112751943A (en) * | 2021-01-19 | 2021-05-04 | 国网江苏省电力有限公司无锡供电分公司 | Data communication method, intermediate device and data communication system |
| CN113031507B (en) * | 2021-03-25 | 2022-08-16 | 超越科技股份有限公司 | High-efficiency transmission method for field bus central server based on OPC UA |
| CN114374708B (en) * | 2021-12-07 | 2022-09-30 | 上海交通大学 | Intelligent factory data automatic subscription method based on collaborative filtering and MQTT |
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