Research On OCF Multi-protocol Access System Technology

Internet of Things(IoT)technology develops rapidly.On the one hand,the renewal iteration of embedded and communication technology makes equipment more intelligent,which greatly promotes the development of the IoT.On the other hand,in order to occupy the IoT market,manufacturers have launched their own IoT standards and protocols,resulting in heterogeneity between devices,which has become a bottleneck in the development of the IoT.Therefore,in order to realize the interconnection of intelligent devices,it is necessary to solve the problem of interoperability of heterogeneous IoT.Based on the OCF standard protocol,this paper studies the interconnection and interoperability of different IoT protocols.The main work is as follows:Firstly,for the interconnection problem between OCF standard protocol and other IoT protocols,an OCF-based multi-protocol access system is designed to access devices of non-OCF server.Its main functions are divided into three parts:adapter manager,adapter and device agent.The adapter manager provides a centralized management service for the adapter,the adapter provides communication services between the client and the server device,and the device agent provides access services for the server device.A semantic transformation scheme between OCF standard protocol and other IoT protocols is proposed in device agent,which solves the interoperability between OCF and non-OCF ecosystem.Secondly,aiming at the service characteristics of OCF multi-protocol access system,a security management scheme based on double key mechanism and access control strategy is proposed,as well as a message processing scheme based on caching mechanism and multi-task mechanism.The former adopts an authorization method of combining static key with dynamic key,and adopts an access control strategy,which improves the security of OCF multi-protocol access system.The latter improves the message response time of the system by using the data caching method,and improves the message throughput of the system by using the multi-tasking method.Finally,the prototype of OCF multi-protocol access system is built,and the semantic transformation between OCF standard protocol and AllJoyn protocol and ZigBee protocol is realized.The interoperability between OCF client and AllJoyn device and ZigBee device is verified in the system.The effectiveness of the security management scheme and message processing scheme of the system is analyzed.