A dynamic timeout algorithm based on a CoAP protocol

Abstract

The invention discloses a dynamic timeout algorithm based on a CoAP protocol. The invention relates mainly to the technical field of Internet of Things communication. After a client sends a CON message, the client can track the number of ACK messages received for each CON message and the delay of receiving ACK messages for each CON message transmission, and the client can dynamically change its ACK_TIMEOUT. It is assumed that the client can modify ACK_TIMEOUT of a client-server link or a client-server link set of each individual client, ACK_TIMEOUT is set to the optimal value for the aspect tokeep the message exchange short or to minimize the number of requests to retransmit ACK messages that are received later than expected, the timeout value of CoAP retransmission mechanism is more reasonable and satisfies more links. The endpoint communication in LAN is more timely, and to some extent, the redundancy of CON message and ACK message is reduced, and the network congestion is reduced.

Description

technical field [0001] The invention relates to the technical field of Internet of Things communication, specifically, a dynamic timeout algorithm based on the CoAP protocol. Background technique [0002] The CoAP protocol sits between the application and the transport protocol. CoAP can be considered as comprising two layers of operations. The first CoAP layer handles User Datagram Protocol (UDP) asynchronous messaging, and the second CoAP layer handles the CoAP methods that carry the request and response, such as GET, PUT, POST, and DELETE, and the associated response codes. The IETF defines four types of COAP messages, Acknowledgment (CON) messages are retransmitted with the default timeout and retransmission parameters of the response. Acknowledgment (ACK) messages are used to acknowledge CON messages. For example, a client may resend a message until it receives an acknowledgment (ACK) from the server that the message contains a message ID that matches the original me...

AI Technical Summary

Problems solved by technology

[0022] The purpose of the present invention is to provide a kind of dynamic overtime algorithm based on CoAP agreement, be used to solve CoAP agreement in the prior art and be based on UDP agreement, and UDP agreement is unreliable, so in order to increase reliability, it has proposed overtime retransmission mechanism, It also provides a default transmission timeout value, but when using this default timeout value for endpoint communication, the efficiency is relatively inefficient, and many redundant data transmissions will be generated, which not only increases network congestion and traffic consumption, but also increases the load on both ends , because they will spend unnecessary time and actions to deal with these redundant data transmissions, resulting in poor communication between endpoints, network congestion and high data redundancy

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