Localhost configuration with MicroROS and CycloneDDS

I'm working with CycloneDDS for ROS2 Humble and I'm trying to use the ROS_LOCALHOST_ONLY variable (or another localhost configuration) with MicroROS. While it worked with FastDDS, I haven't been able to establish communication between the agent and the ROS system using CycloneDDS, even though both are running on the same machine.

The (serial) connection between the agent and the microcontroller is successfully established, and all instances (subscribers, publishers, etc.) are created without issues. However, the topics are not visible in any other terminal on the machine.

Everything run on Ubuntu22/Jetpack6.

Is there an option to enable this configuration or will it be included in the future?

首先检查 micro-ROS agent 如何配置 ROS_LOCALHOST_ONLY 和 CycloneDDS，并将报告中的设置与正常工作的 FastDDS 情况进行比较。重现 Ubuntu 22/Jetpack 6 设置，并检查是否可以从另一个终端看到 agent 话题；完成的标准是使用 CycloneDDS 时 localhost 通信正常，或已记录受支持的限制。

由索引模型根据 Issue 内容生成。