Research And Application Of Wireless Networking Technology For The Internet Of Things By Combination Of Cloud And Terminal

With the wide application of the IOT technology and the increasing demand of large-scale equipment networking,wireless networking technology of Internet of things has become a research hotspot.Wireless networking has incomparable advantages over wired networking,such as flexible networking and simple wiring.Due to the complexity of the application requirements of the Internet of things,networking technologies based on a variety of wireless communication technologies,such as Wi-Fi,Zig Bee,Bluetooth,NB-IOT,LORA and so on,have been proposed and applied to the Internet of things.However,these networking technologies have their own limitations and advantages and disadvantages.Especially for a kind of application environment with dense equipment,easily changing nodes and unbalanced uplink and downlink data,there is no wireless networking technology with the best cost performance to meet the demand.Based on this,this paper combines Bluetooth wireless technology,cloud computing technology and edge technology,and proposes a kind of the IOT wireless networking technology based on the combination of cloud and end.This technology adopts star topology structure based on gateway and sub nodes,and uses lte-cat1 technology to connect gateway and public network,so as to realize intelligent ad hoc network between gateway and sub nodes and dynamic management of nodes;At the same time,an improved unidirectional broadcast multi monitoring mechanism is proposed to solve the problem of wireless signal interference in the case of equipment intensive,and the dynamic priority mechanism is used to solve the problem of data imbalance between uplink and downlink.On this basis,this paper proposes an algorithm combining multi gateway hot standby mechanism with edge computing to solve the reliability and security problems of the networking technology.Finally,combined with the actual project,the IOT networking technology proposed in this paper is applied to the upgrading of the sharing economy industry,and the massage chair networking and control system is developed and implemented.The main research contents and innovative achievements of this paper are as follows:1.Deeply research and analyze the existing IOT wireless networking technology.Aiming at the application environment of dense equipment,easy change of nodes and imbalance of uplink and downlink data,this paper proposes a kind of IOT wireless networking technology based on the combination of cloud and terminal.Different from the typical Bluetooth mesh networking,this technology uses the star topology structure based on gateway and sub nodes,uses lte-cat1 technology to connect the gateway with the public network,and sends the terminal MAC address and identity information through the cloud platform to realize the intelligent ad hoc network between the gateway and sub nodes,as well as the intelligent management of the gateway for the dynamic network(access network of nodes).The communication between the gateway and the sub nodes adopts the mechanism of single monitor and multi broadcast,which realizes the real-time transmission of uplink data.Aiming at the problem of wireless signal interference under this mechanism,an anti-interference communication algorithm based on broadcast delay is proposed,which effectively reduces the occurrence of interference.2.Aiming at the problems of limited number of nodes and downlink data(control)delay under multi broadcast mechanism,an improved networking mechanism based on gateway unidirectional broadcast and sub node monitoring is proposed.This mechanism effectively solves the interference problem and realizes the real-time of downlink data.On this basis,a dynamic communication algorithm based on priority and automatic optimization of acquisition interval is proposed,which effectively solves the problem of uplink data delay of some devices.The experimental results show that the mechanism works well under the condition of low data acquisition frequency and high real-time requirement of downlink data.3.Aiming at the reliability and security problems of single gateway and broadcast mechanism in star networking mechanism,this paper proposes multi gateway hot backup redundancy and gateway identification and data encryption technology based on token and DES algorithm,which solves the reliability of communication between IOT LAN and mobile public network and the security of communication between terminal nodes.A main gateway election algorithm based on edge computing is designed to realize seamless switching between the main gateway and the slave gateway.At the same time,by storing the encrypted gateway identity to the terminal and modifying it regularly,the problem of identity mutual recognition between the sub node and the gateway is effectively solved,and the security of communication is improved.4.In order to verify the wireless networking technology proposed in this paper,the Bluetooth wireless intelligent networking technology combined with cloud and end is applied to the sharing economy industry,and the corresponding software and hardware system is developed.Through practical application,it is found that the intelligent networking technology proposed in this paper fully meets the requirements of practical application,and the system is safe,stable and reliable,and has achieved good results.The wireless networking technology of Internet of things proposed in this paper effectively solves the problem of automatic networking under dense equipment,and has the advantages of convenient networking,dynamic node configuration,high cost performance,network security and reliability.