基于Contiki的CoAP协议分析

Analysis of CoAP Principle Based on Contiki

受限制的应用协议(CoAP)是专门为资源受限设备和网络优化设计的一种网络传输协议,它采用REST风格架构,为资源受限环境进行重新设计,实现了超文本传输协议的一部分功能子集,允许用户通过浏览器直接访问物联网节点,进行资源发现和数据查询等,是物品万维网技术的核心。文中介绍了受限制的应用协议的工作原理,在Contiki系统支持下利用Cooja搭建虚拟无线传感器网络,设计了受限制的应用协议分析的实验环境和实验方案。在无线传感器网络仿真运行过程中,利用协议分析软件捕获受限制的应用协议报文,然后对捕获的受限制的应用协议报文进行分析,说明了受限制的应用协议的报文格式、工作模式和选项字段的作用,描述了GET和POST方法的工作过程,从理论和实践两方面阐述了受限制的应用协议的工作原理。

The Constrained Application Protocol (CoAP) is a network transport protocol that is specially designed for resource-constrained devices and network optimized design.It uses a REST-style architecture to redesign resource-constrained environments and implements a subset of the HTTP functionality,enabling users to access the IoT node resources through the browser directly,making resource discovery and data query,which is the core of the world wide web technology.We introduce the working principle of the CoAP,adopt Cooja to build a virtual wireless sensor network supported by the Contiki system,and design the experimental environment and scheme of CoAP analysis.During the wireless sensor network simulation running,the protocol analysis software is used to capture the CoAP report,and then the captured CoAP messages are analyzed,explaining the role of CoAP message format,working mode and option fields,description of the working process of GET and POST methods,and elaborating the work principle of the CoAP both theoretically and practically.