Design And Implementation Of Wireless Sensor Network For Greenhouse Based On LoRa And IPv6

Under the rapid development of smart greenhouse and precision farming,agriculture wireless sensor network,as the foundation of the communication services and information transfer conditions,has become a hot research field.The low power wireless sensor network can fit well to the agricultural production conditions because of its ability to transmit over long distance with low power consumption and its large capacity,so it also ushered in the blowout development boom.After practical application and market selection,a group of excellent network architectures,such as Lo Ra WAN,Sigfox and NB-Io T,stand out from many agricultural low-power wireless sensor networks and become the main force of the current agricultural Internet of Things.However,at present,the global IP Internet architecture based on IPv6 has been gradually formed,and the emergence and application of a large number of heterogeneous networks in the greenhouse has gradually hindered the coordinated development of the agricultural Internet of Things and the global Internet.Therefore,taking IPv6 as the upper layer network service protocol and Lo Ra WAN as the lower layer network transmission protocol for heterogeneous network protocol fusion is of great practical significance for the development of agricultural wireless sensor network such as greenhouse.At present,there are very few studies on heterogeneous protocol fusion between IPv6 and Lo Ra WAN,and there are not yet complete and mature theoretical systems.In the previous heterogeneous network protocol fusion of IPv6 and Lo Ra WAN,only the basic network implementation of the fusion protocol was carried out,but no further network adaptation and optimization are carried out on the fusion protocol stack,which resulted in excessive energy consumption,network access process and link redundancy in the practical application of the fusion protocol stack.In this paper,experimental schemes and model construction methods of Lo Ra and IPv6 protocol fusion at home and abroad are studied and summarized.Through the combination of theoretical analysis and experiments,targeted adaptation and optimization of the fusion protocol stack in the application of low-power wireless sensor network based on greenhouse are carried out.The main research contents are as follows:(1)Research on the development status of greenhouse technology and protocol fusion at home and abroad.In this paper,the greenhouse sensor network technology,IPv6,Lo Ra technology and protocol fusion technology at home and abroad are studied and analyzed in detail.Combined with the advantages of Lo Ra and IPv6 in low-power WAN(Wide Area Network)and global Internet,the design scheme of Lo Ra WAN and IPv6 fusion protocol stack applied in greenhouse wireless sensor network is proposed.(2)6Lo Ra WAN adaptation layer design.In order to achieve the seamless fusion between Lo Ra WAN agreement and IPv6 protocol,this paper makes an in-depth analysis of Lo Ra WAN protocol stack and IPv6 protocol stack.And a 6Lo Ra WAN adaptation layer was added between the network layer of the fusion protocol stack and the MAC layer combined with the existing fusion scheme.Through the deep optimization of the adaptation layer,to achieve the IPv6 address acquisition of Lo Ra terminal based on pseudo MAC address in the fusion protocol stack,data sharding recombination mechanism of dual management of time and memory,dynamic context header compression and IPv6 protocol clipping,so that the low-power data communication between heterogeneous protocols is completed.(3)Building of system construction based on 6Lo Ra WAN fusion protocol stack.Lo Ra chip based on Semtsch SX1278 was used on Lo Ra terminal by adopting the development suite recommended by Lo Ra alliance,and raspberry pie 3B+ was used as control module to build terminal node and gateway based on Lo Ra WAN and IPv6 fusion protocol stack.On the server side,Apache+My SQL+PHP architecture based on Liunx system was adopted to build the Web front end,which was applied in the greenhouse.Finally,a complete greenhouse wireless sensor network system based on Lo Ra and IPv6 was built.(4)Test and analysis of fusion protocol system.In order to verify the effectiveness and practicability of the 6Lo Ra WAN fusion protocol system,the network system is tested and analyzed in this paper.It mainly includes the test of stateless address auto-configuration based on pseudo-mac,the test of data transmission function,the comparative analysis of shard recombination energy consumption based on dual management mechanism and the test of 6Lo Ra WAN communication and header compression function.Through the final data analysis and actual test results,the reliability of the design and function of the system is verified.