Design And Implamentation Of Wireless Network Access Control System Based On FreeRTOS

Smart community is not only the key content of smart city development,but also the foundation of smart city.As the one of the many Internet of Things devices in the construction of smart communities.Higher requirements for its convenience and cost performance is required by people because of the particularity of frequency and environment of using access control system.Therefore,it has high application value to develop a safe,convenient and high cost performance access control system.The current status of the security,convenient,and cost performance of the existing access control system is studied in this paper.And there are some shortcomings in the existing access control system is discovered.For instance,easy to copy,easy to crack and other security problems exist in the traditional access control,such as password identification access control and card identification access control.And the issues such as unstable recognition rate caused by skin damage and may involved privacy protection caused by the collection of fingerprints and photos,exist in the new type of access control systems,such as fingerprint access control and face recognition.It is difficult for Hi-tech access control such as iris access control to promote because of the high price.Therefore,the plan is analized and determined based on the actual use environment and user needs in this paper,and a wireless network access control system with lowcost,high-security,convenient and easy-to-use is implemented through the design of hardware and software and the design of the safety certification process.This system based on FreeRTOS operation system,With ESP32 which built-in Bluetooth and AIR720 G responsible for 4G network transmission as the control core.The performance index of access controller is achieved through the design of hardware modules,two-machine communication transmission protocol,independent controllable security authentication protocol process,and the utilize of technology such as 4G network communication technology,Bluetooth technology,asymmetric cryptography technology,audio control technology and MQTT network technology.The controller system design of the access control system is mainly completed by this paper.The major research work is as follows:(1)Analyze security issues such as data leakage,Replay Attack,and Man-in-theMiddle Attack that may exist in data interaction scenarios in access control unlocking,design a PKI system,and solve data authentication problems.(2)A data transmission protocol is designed based on YMODEM,aiming at the problem of data packet loss and shift in the network data forwarding protocol of access control system development.The problem of data packet loss and ensures the reliability of transmission data solved by this protocol.(3)The security unlocking process,audio scheduling control are designed as the system function modules.The hardware circuit designed and debugged of access control controller,and the corresponding control software is developed.(4)A voice broadcast module is designed.With voice advertising and promotion functions,the system have high cost performance.And the incompatibility is improved between the speed and security of the traditional bluetooth access control system and the limitation of the unlocking distance,and realizes the characteristics of the access control system,such as convenient,easy to use,safe and fast.The actually access controller system designed by this paper has passed the test of the Testing Center for Quality and Police Electronic Products under the Ministry of Public Security,and the product has been installed and tested on enterprise and the laboratory of the School of Electronic Engineering.This system stable,reliable and convenient to use as the test result shows,and has the better application prospects.