The Design Of IOT Gateway Based-on Embedded System

In recent years.with the development of information technology.the communication between people and the way of communication is becoming more and more diversified.but the existing communication technique has been separating the IT kind of equipment and physical equipment.On the one hand,computers,smzart phone,i-pad and IT kinds of intelligent equipment,with the help of the Internet.4G,GPRS/GSM transmission network.has realized the communication between human beings.On the other hand,with the help of ZigBce.RFID.UWB and other short distance communication technology.the physical device through a variety of sensing devices will digitizing abstract information.to achieve a small range of small-scale LAN interconnection.IOT gateway as the link between the sensor network and transmission network,playing,an important role in Internet of Everything.to integrate the sensor network with communication network.Based on the above problems.this article first to explain the overall structure of the Internet of things.in which lOT gateway should have protocol conversion ability,management ability,comprehensive ability of access.Through the study of the wireless sensor network technology.embedded system technology,embedded Internet technology research,puts forward the overall design scheme of IOT gateway.On the hardware design,the gateway use ARM CortexA8 series embedded processor S5PV210 as the main controller,integrating the ZigBee module.Ethernet module,GSM module.and other function modules to built gateway hardware platform.For the IOT gateway widely access ability,designing a variety of equipment interface such as the USB,RS232.analog input/output and digital quantity input/output.On the software design,carrying embedded Linux operating system on IOT gateway.The kernel of LINUX shows high stability in the existing hardware and high efficiency when dealing with network protocol,in addition.its interior contains a complete TCP/IP protocol stack.It is very suitable for this paper to set up web server within the operating system.write CGI programs and HTML web page files,achieve the B/S structure of the HMI.The message processing function is also joined in the IOT gateway.The user can use mobile phone to monitor the ZigBee sensor network.when he can't open web page.In the ZigBee network,this paper designs the star sensor network with long-range control.information collection.information processing function.After completion of the software and hardware design.this paper performs some experiments to test the/igBec network.Ethcrnet communication,message processing and?wceb interface monitor.The transmiss,ion quality of gateway is good.with the sampling period of 800ms.the transmission success rale can reach above 95%.and the expected requirement of the Internet gateway is realized.