Research And Implementation Of Message Middleware Protocol For Internet Of Things Cloud Platform

With the rapid development of information technology represented by computer science and communication technology,Internet of Things has developed into a hot field of current scientific research,which has attracted the attention of academia and industry.The improvement Internet technology and hardware manufacturing level has also made a good basis for the further improvement of Internet of Things.Message Queuing Telemetry Transport protocol is a lightweight message protocol based on publish / subscribe mode released by IBM.Its design idea is open,simple and easy to implement,and it has been widely used in the Internet of Things.However,for complex and changing network environment and a large number of different types of users access to resources and protect privacy data,as well as the large-scale use of resource-constrained node devices,the existing information protocols of Internet of Things cannot meet the different needs of users.In this thesis,for the hardware resource-constrained Internet of things nodes equipment,we treat non-trusted network and different types of users to share resources and protect privacy data as the research background,and design a new protocol with strengthen security performance and resource access control based on the MQTT protocol.First,use the authorization mechanism to manage the user's subscription rights,allowing only users with legitimate rights to subscribe and publish messages.Add user-defined command packets to the message protocol,provide services that can flexibly manage publish / subscribe permissions,and enable resource sharing and privacy data protection for multiple types of users.Then,use the sending window / receiving window to control the transmission of the message,carry out prevention of replay attacks,and strengthen the security performance in resource-limited environment.Finally,this thesis simulates the design of the message middleware protocol,designs and implements a distributed message service cluster test system,verifies the performance of the rights control and replay attack in the design protocol,and analysis security performance according to the experimental results.