An issue with subscribing to custom messages from ROS network

Question

Nima Mathwork 2021-2-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/732363-an-issue-with-subscribing-to-custom-messages-from-ros-network

评论： Nima Mathwork 2021-2-3

Hello everyone

I am using the ROS toolbox of MATLAB R2020b on windows 10. I used ROS Custom Message Support for building my custom messages. I established a ROS network with another system with Ubuntu 18.04 OS. While I can publish topics to the network through Simulink, I could only subscribe to those topics I published from Simulink and not the topics published from the Ubuntu system.

What could cause this issue?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Cam Salzberger 2021-2-1

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/732363-an-issue-with-subscribing-to-custom-messages-from-ros-network#answer_611603

Hello Nima,

Issues with ROS communication between machines, especially if messages can be received from one machine but not the other direction, are most commonly caused by the ROS_IP environment variable not being set correctly in the other machine (in this case, your Ubuntu machine). See this post for more details.

Another possibility is that your firewall isn't allowing communication. One quick-fix can be to mark MATLAB as a trusted program.

-Cam

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Nima Mathwork 2021-2-3

Thank you Cam

I set the ROS_MASTER_URI and ROS_IP according to the suggestion from the link you provided. I also edit the firewall setting to allow MATLAB and Python to communicate through the Windows firewall.

Now, everything works smoothly.

请先登录，再进行评论。