Design And Implementation Of Smart Campus Gateway Based On Bluetooth Low Energy

With the continuous innovation and development of information technology in the educational domain,the construction of smart campus is also developing from universities to primary and secondary schools.Especially,Artificial Intelligence and Internet of Things have developed rapidly in recent years,the combination of the two technologies provides a new opportunity for the construction of smart campus in primary and secondary schools.Bluetooth Low Energy features low cost and long endurance,which has widespread used in Io T.Smart campus system is also one of them.Smart campus system is mainly composed of cloud platform,bluetooth gateway and peripheral embedded devices.The bluetooth gateway has transplanted the Blue Z protocol stack supporting Bluetooth 5.0.Its design and implementation is mainly to solve the problem that embedded devices are difficult to manage in the smart campus system.It’s also convenient for the cloud platform to collect information and manage the devices.Bluetooth gateway adopts three layers of software structure,which is divided into system layer,data communication layer and application layer from bottom to top.Based on this,the main work includes the implementation of bluetooth communication,data security and device authentication,implementation of application layer.Firstly,a cache design is proposed to optimize the bluetooth connection communication.In addition,in order to facilitate the application layer,the data communication interface is encapsulated,and the data packet format is designed for the needs of bluetooth gateway.After the establishment of the bluetooth communication,we focus on the communication security.The security vulnerability of bluetooth communication in smart campus is analyzed,and according to the characteristics of bluetooth devices in smart campus,the appropriate encryption method for BLE broadcast and connection communication are given respectively.We also propose a kind of device authentication mechanism.At last,the application layer of the bluetooth gateway is introduced.Firstly,the choice of cross process communication technology is determined.Then,the effect and the detailed implementation of four classic applications are illustrated by combining the flow chart: device attendance,device timing,data transmission and firmware upgrade.The test shows that the bluetooth gateway can meet the needs of use and has a certain practical value.