OPC UA Pub/Sub 通过传输层传输消息。从目前公布的文件上看，OPC UA Pub/Sub 具有四种传输方式。

1. 在LAN 中使用UDP 广播机制实现快速Pub/Sub 消息交换，UADP 消息映射
2.  直接在Ethernet 网上传输 将UADP 消息映射到Ethernet 帧中。以太类型为0xB62C 。
3. 通过MQTT，AMQP消息代理消息交换。
4. 通过TSN 时间实现消息交换
    

UADP格式编码用wireshark解码需要专用插件。

 CW Wireshark Dissectors / OPC UA PubSub UADP Dissector · GitLab

 下载wireshark版本对应的so  dll，

放置 到plugin目录下epan目录下，重启wireshark，查看插件加载情况。

1. Go to the Releases page and download the current version of the pre-built plugin for your operating system and Wireshark version. It is available as .dll on Windows and .so on Ubuntu for Wireshark versions 3.6, 3.4, and 3.2.

2. Find out what your Wireshark plugin folder is. In Wireshark, go to Help -> About Wireshark -> Folders or run tshark -G folders and look under Personal Plugins.

3. Move the downloaded plugin to the folder (you might have to create some subfolders, so that the plugin lies in .../<Wireshark version>/epan) and restart Wireshark.

4. Check that the installation was successful by going to Help -> About Wireshark -> Plugins or run tshark -G plugins and check that opcua_pubsub_<version>.[dll/so] shows up. You can also check that the plugin is working by opening one of the capture files from the examples/.

下载页面位于：

Releases · CW Wireshark Dissectors / OPC UA PubSub UADP Dissector · GitLab