MQTT报文的优化与拓展

he MQTT protocol has a wide range of applications in the Internet of Things. However, after analyzing the MQTT protocol, it is found that there are some problems. For example, the publisher cannot control the whereabouts of the published message, and the field used for high frequency is not optimized, also, the client cannot know the topic structure. This paper will focus on the research of MQTT protocol, optimize and expand the MQTT protocol, and make it better to undertake the corresponding work. This paper designs and implements the directed publishing mechanism, field registration mechanism and topic information query mechanism. The above mechanism is realized by expanding several control messages based on the original protocol and optimizing the related messages in the original protocol. The above scheme was tested in the Windows environment. The test results show that the new mechanism works normally, which effectively enriches the function of MQTT, and the average length of optimized and expanded packets is significantly shortened.