Research On Access And Communication Technology Of Intelligent Terminal Devices In Internet Of Things

In recent years,the concept of the Internet of Things has gradually become familiar to people,and the technology and application of the Internet of Things have also been greatly developed,and are slowly integrated into people’s lives and work.However,with the development of the Internet of Things industry,the number of smart terminal devices of the Internet of Things is also increasing rapidly,which means that the cloud platform is more likely to be invaded by illegal devices,and the devices will also face more access security issues.At the same time,the environment in which the device is located is complex and diverse,and the interaction stability of the device itself becomes insufficient.Moreover,the communication between multiple devices will be more frequent,and the amount of data interaction will be larger.A single communication method cannot cope with complex communication situations.Aiming at the problem of device access under the existing cloud platform and the problem of device management and communication after access,this paper designs a device identity authentication scheme based on device fingerprints.At the same time,a digital cloning mechanism is built on the cloud platform to ensure the stability of device operation.In addition,the communication scheme between devices is optimized,and the communication efficiency between devices is improved.The work and results are as follows:1.An authentication scheme for IoT devices is studied.An IoT device authentication scheme based on device fingerprints is designed,using active device fingerprint technology,combined with hardware parameters and device registration information collected for devices to generate device fingerprint data.The generated device fingerprint data is stored in the cloud and on the device side at the same time,and is used as the core data for verifying the identity of the device for subsequent signature verification during device login.2.Design and implement the digital clone mechanism of cloud platform equipment.On the basis of the MQTT communication protocol,build corresponding digital clones for devices under each platform in the cloud,communicate and subscribe to the interactive information between the device side and the APP side,and maintain the digital clones in the cloud in the form of JSON documents in real time Update and be ready to sync data to devices that need it at any time.At the same time,part of the JSON data of the digital clone is displayed on the device management page in the form of a chart.3.Designed a LAN device communication scheme based on the CoAP communication protocol,studied the communication optimization technology between devices,analyzed the application requirements for necessary communication of IoT devices in the case of limited use of cloud services,and designed a device communication scheme under the LAN.In addition,the retransmission mechanism of the CoAP protocol is optimized,so that the retransmission timeout period can be adaptively adjusted according to the actual situation.