Research On Intelligent Management System Of IoT Equipment Based On SDN

With the continuous development of wireless sensor network technology and semiconductor component technology,IoT technology is gradually entering people's lives.From intelligent agriculture,smart industry to smart logistics,smart city,the extremely broad application prospects have pushed the Internet of Things to the waves of the development of the times.It also brings the management problem of mass heterogeneous terminal equipment.The current equipment management systems are often targeted at special applications.The change of management intent requires reconfiguration of edge devices,mass terminal devices and so on,which is time-consuming and labor-intensive,and it is difficult to deploy new applications quickly and flexibly.This thesis draws on the idea of separation between controlling and forwarding in SDN,designs a device management system architecture based on SDN,and studies from two aspects of IoT gateway and IoT controller based on SDN.First,the design and implementation of SDN-based IoT gateway is carried out.Based on the original gateway function model,the flow table processing module and resource virtualization module have been added,and the function design and implementation are carried out.The resource virtualization module is mainly responsible for protocol adaptation and device resource abstraction.The former solves the heterogeneity of the sensing layer terminal,while the latter abstracts the hardware resources into software entities through resource virtualization.The module solves the problem of near-end management and control of the gateway to the terminal node,and lays a foundation for subsequent matching processing.The flow table processing module implements management operations on related devices according to matching of flow table entries,but the OpenFlow protocol is not directly applicable to device management of the Internet of Things.In this thesis,the index table structure and the flow table entry structure are adaptively improved.Through experiments,the feasibility of the gateway function is verified.The gateway can provide a method for managing each terminal device and perform management operations according to the flow table.Then,the design and implementation of SDN-based IoT controller is carried out.The controller is a newly introduced component in the device management system architecture,which is mainly used for centralized management of multiple gateways and business delivery.This thesis redesigns its functional structure according to equipment management requirements,and proposes a user-oriented intent northbound interface model,which reduces the threshold of users and realizes the expression of user management intention.Subsequently,the business management module is designed around the business implementation and switching,and its three functional modules including semantic analysis,task management and messaging are designed and implemented.Through experiments,it is verified that the controller can implement functions such as service delivery,service switching,abnormal message flow processing,service monitoring and so on.Finally,this thesis designs and implements a prototype of SDN-based equipment management system,which verifies the feasibility of applying SDN to IoT equipment management.The system can implement the functions of trusted access,data monitoring,reverse control,service delivery/switching,and service status monitoring of the device,which basically solves the management problem of mass heterogeneous terminals and enables flexible service switching.