An issue with subscribing to custom messages from ROS network
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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?
Cam Salzberger on 1 Feb 2021
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.