DDS发布订阅通信节点自动发现机制与改进

DDS 作为一种新兴的非确定性网络中的高可用性分布式数据分发规范，提出了全局数据空间的概念， 通过发布订阅机制进行通信，然而当前航电网络环境下，对于应用来说，DDS 封装严密，很多过程对于应用 来说属于黑盒过程，难以准确把握其流程，一旦出现异常和故障也难以定位和排故。本文以航电以太网为例， 详细研究DDS 发布订阅过程与通信行为，并以一个故障研究与排除实例，说明DDS 发布订阅具体流程和逻辑， 并对DDS 在以太网协议层和应用层的通信行为进行研究。

Research on DDS Publish-Subscribe Communication Behavior and Improvement

As a new high-availability data distribution specification in non-deterministic networks, DDS proposes the concept of global data space and communicates through a publish-subscribe mechanism. It is said that DDS is tightly packaged, and many processes considered as black box process to the applications, and it is difficult to accurately grasp the process, and it is difficult to locate and troubleshoot once abnormalities and faults occur. Avionics Ethernet is taken as an example to study the DDS publish-subscribe process and communication behavior in detail, and an example of fault research and troubleshooting is used to illustrate the specific process and logic of DDS publish-subscribe mechanism. And the communication behavior of DDS at Ethernet protocol layer and application layer is studied.