Method and device of data communication in constrained application protocol

Abstract

The embodiment of the invention provides a method and a device of data communication in a constrained application protocol (CoAP). The method comprises the following steps of: receiving a request transmitted from a terminal; processing Via option information based on whether an agent node stores parameters and status of session corresponding to the request, wherein the Via option information is used for recording a request path and a response route; and transmitting the processed request. By the technical scheme, the stateless proxy can be realized, stateful proxy nodes and the stateless proxy nodes are allowed to exist simultaneously on the transmission path of the same session, and the routing information of the path in the protocol report can extract through the stateful proxy nodes and then delete the routing information so as to change to the routing information of the local storage route, thus shortening the routing information carried in the protocol message, increasing the usage efficiency of the proxy node resource, and reducing the communication delay or interruption caused by the proxy node rush or fault.

Description

technical field [0001] The present invention relates to the field of data communication, and more particularly, to a method and device for data communication in CoAP, a constrained application protocol. Background technique [0002] CoAP (Constrained Application Protocol) is mainly used in M2M (machine-to-machine) scenarios, such as home controllers, building automation, smart energy, sensor networks, etc. In such an environment, the functions of these machines are relatively simple. Generally, the processor has only 8 bits, the storage space is small, it does not support complex transmission protocols, and the data transmission rate is also low. CoAP provides a request / response interaction model that supports embedded resource discovery, including key web page concepts such as Uniform Resource Identifiers (URIs) and content types. [0003] The CoAP is transmitted based on a User Datagram Protocol (UDP for short). Its interaction mode can be a synchronous response or an as...

AI Technical Summary

Problems solved by technology

[0010] The proxy node that has stored session state and recorded session-related data is limited by its storage capacity and can only store a certain number of subscription session states. If the number of subscriptions exceeds, this proxy node cannot process new subscription requests

[0011] Because the increase of routing information causes the message to be fragmented, or the increase of message routing information increases the storage capacity of the server, and the performance of the server as a proxy node is limited, the increase in storage capacity reduces the number of subscriptions that can be stored at the same time , causing delays in communications or failure to send

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