Design Of Community Equipment Monitoring System Based On NB-IoT

In recent years,the Internet of things(IoT)technology in the application of wisdom city,intelligence community has made rapid development,but the use of IoT technology to realize the community industry,equipment in the field of risk monitoring is a complicated problem,it still exist devices and the cloud data are difficult to fusion,and the problems of difficult to realize the integration of monitoring and early warning.The community's facilities include electricity,water,natural gas,fire protection,HVAC(heating,ventilation,air conditioning),elevators,etc.These operating systems typically consist of a variety of sensors,actuators,and devices.Obviously,the data formats and communication protocols for these assets are complex and difficult to access uniformly.Therefore,the establishment of a unified Internet of things community architecture is a very necessary and complex task.To address these problems,this paper proposes a NB-IoT based monitoring system for community devices,which is composed of an End-Edge-Cloud architecture.It uses OICT(operational technology,OT;information technology,IT;communication technology,CT)at the three levels of end,edge and cloud to realize the integrated real-time monitoring of community equipment.First,the end side includes the 6LoWPAN Wireless sensor network(IPv6 over Low power Wireless Personal Area Networks)and the community multi-protocol devices to realize the omni-directional perception of the community devices.The6 LoWPAN edge routing hardware adopts the combination scheme of "CC2538+raspberry PI" and realizes the routing function through 6lbr in the software.The hardware of 6LoWPAN nodes adopt the "CC2538+Arduino" scheme,and develops the data acquisition interface circuit.Arduino programming is used in the software to realize data acquisition,and multi-threading of CONTIKI is used to realize the transmission function.Secondly,on the edge side,NB-IoT-WSN gateway access of 6LoWPAN sensor network data fusion.At the same time,in order to solve the data access problem of multi-protocol devices in the community,a multi protocol conversion and data to a cloud method is proposed.At the same time,in order to solve the data access problem of multi protocol devices in the community,a method of multi protocol conversion and data to the cloud is proposed.This method processes the data of multi protocol devices into the data of standard JSON format of mqtt protocol and transmits it to the cloud platform through NB-IoT network.NB-IoT communication and peripheralcircuits based on ME3616 were designed on the hardware,and industrial nodes and nb-iot-mqtt nodes were developed by using the Node-RED platform on the software to realize data aggregation on the terminal side and communication functions on the cloud.Finally,a community device monitoring system was established by using the thingsboard platform in the cloud to achieve device management and real-time monitoring and early warning.Experimental scenarios were set up to verify the proposed system and architecture.