基于树莓派与MQTT的智能网关设计

Intelligent Gateway Design Based on Raspberry PI and MQTT

针对物联网环境终端节点数据传输协议多样化、网络服务中心化的问题,设计了一种基于MQTT协议的协处理网关。网关选取树莓派作硬件平台,以嵌入式可移动设备为基础,基于MQTT协议事件发布订阅的消息传输模型,构建了集成服务代理、数据管理、协议转换、状态监测等功能的系统结构,建立了由感知层、服务层、应用层的通信链路,并完成了网关系统整体配置与消息发布订阅模型的设计,实现了网关、感知设备和用户的双向通信。实验测试显示:智能网关能建立稳定的通信连接,准确完成数据的接收与发送,实现多点间的数据通信,数据传输过程稳定,在测试过程中未出现信息丢失。MQTT协议结构的智能网关实现了消息双方在时间、空间及同步的解耦。网关缓解了中心化网络服务带来的堵塞,提高了数据的通用处理能力,提升了数据传输效率。

Aiming at the problems of the diversity of terminal node data transmission protocols and the centralization of network services in the Internet of Things environment,a co-processing gateway based on MQTT protocol is designed.The gateway selects Raspberry PI as the hardware platform,takes embedded mobile devices as the basis,and builds a system structure integrating service agent,data management,protocol conversion,status monitoring and other functions based on the message transmission model of MQTT protocol event publishing and subscription.A communication link consisting of perception layer,service layer and application layer is also established.The whole configuration of gateway system and the design of message publishing and subscription model are completed,and the two-way communication between gateway,sensing device and user is realized.The experimental test shows that the intelligent gateway can establish a stable communication connection,accurately complete the data receiving and sending,and realize the data communication between multiple points.The data transmission process is stable,and no information loss occurs in the test process.The intelligent gateway of MQTT protocol structure realizes the decoupling of the two sides of the message in time,space and synchronization.The gateway alleviates the congestion caused by centralized network services,improves the general processing capacity of data,and improves the efficiency of data transmission.