Method for state presentation based on MQTT

Abstract

The invention discloses a method for state presentation based on MQTT. The method comprises the steps that 1, state messages sent to a second client by a first client are received; 2, the state messages needing to be cached are refreshed, wherein according to the refreshing process, the newest state message is restored and the earlier state messages are deleted according to the time sequence; 3, the newest state message is stored to a caching zone; 4, the newest state message stored in the caching zone is pushed to the second client. The invention further discloses a system for state presentation based on MQTT. The system comprises a state message receiving unit, a state message refreshing unit, a state message buffering unit and a state message pushing unit. According to the method, state presentation is achieved on the basis of MQTT, the advantage of low weight of MQTT is obtained, and meanwhile the effectiveness of the state messages is guaranteed according to the mechanism that only the last state message is cached.

Description

technical field [0001] The invention relates to a method for realizing state presentation based on MQTT, in particular to a method for realizing state presentation based on MQTT. Background technique [0002] Presence service means that a user or client publishes its current communication status to other users. For example, it may announce that it is currently free or busy. When other users communicate with this user, the published status can promptly prompt their current communication possibility and willingness, etc. The most commonly used method at present is: on the instant messaging client, display a clear round mark and corresponding text for each state of the user. Status presentation applications mainly include personal applications and industry (group) applications: [0003] Among them, personal applications generally include: [0004] 1. Personalization of address book: With personalized address book information, the owner can control the information in the oth...

AI Technical Summary

Problems solved by technology

[0027] 1. Based on the SIP protocol, the protocol process is relatively complicated. The problems of NAT traversal and firewall on SIP also exist on SIMPLE

[0028] 2. Based on the XML text to identify the state, the cost of state identification is relatively high

[0029] 3. The protocol interaction process is complicated

[0030] 4. The cost of installing and deploying the XCAP system is relatively high, and there are relatively high requirements for hardware;

[0031] 5. For the terminal, the traffic and power consumed are relatively large

[0037] 3. For the terminal, the traffic and power consumed are relatively large;

[0038] 4. The cost of deploying hardware is high

[0054] However, based on the current MQTT protocol specification, the function of status presentation cannot be realized, and it needs to be extended

[0055] When the QOS of the MQTT PUBLISH message is 0, there is no guarantee that the client can receive the corresponding message. When the network condition is not good, the client cannot receive the message. For the corresponding status presentation, it cannot perceive the current status of other users. ; In addition, because the message with QOS of 0 is not cached on the server, after a new client logs in, it cannot obtain the current status of other users from the server in time, and the corresponding status message will not be received until other users release a new status

[0056] But when QOS is set to 1 or 2, there will be problems. When QOS is 1 or 2, it will ensure that the client will receive every message. If the client is offline for a long time, it will receive it after going online. A large number of historical status messages, these historical status messages are meaningless, the client only cares about the latest status of other users

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