Research And Implementation Of “IoT+” Oriented System Architecture Based On The Model Of Aggregation And Extension For Supply And Demand

Computer application has experienced three major phases of single computer,Internet networks and Internet of things.The emergence of the IoT makes objects of the Internet extensible to any object which is accessible to the network.The "IoT+" indicates the synergy and interoperation among objects.However,there is no mature and popular standard for the development of Io T system,which is easy to form information isolation and difficult to achieve the true interconnection of all things.In view of above issues,this paper puts forward a new architecture of IoT application system,which provides a uniform IoT object accessing method by summarizing IoT applications,and presents an IoT object system model based on the extension of IoT object aggregation,supplying an efficient method and tool for advanced Io T development.This architecture proposed an IoT framework based on the model of aggregation and extension on supply and demand(abbreviated as AESDM),which consists of three layers:presentation layer,AESDM and demand and plug-in layer.Among them,the presentation layer is an abstraction of Io T object;AESDM is the core of the framework,including the supply model and demand model;the plug-in layer renders all sorts of services.The supplier is the access agent of Io T object and the demander plays the role of client for the supplier,which is a group of APIs in form.The coordination of supplier and demander implements the chained calling and aggregation and extension of suppliers,and sets up the theoretical foundation for the proposed framework.The communication between demanders and suppliers is on the basis of EITP protocol,which is an application layer protocol,extensible,easy to debug and readable.On account of the forementioned features of EITP protocol and the characteristics of message structure,the AESDM model defines a set of specifications on message structure and message extension as well.In the end,on the basis the above research and design,this paper realized the uniform access specification of IoT object,and applied it into three practical cases: the shared-parking system,mobile phone monitoring system and the remote infrared experiment based on Ardunio singlechip,which verifys the theoretical and practical feasibility of the proposed framework.