ROS Logger doesn't show the topics

I am working with MATLAB R2024b on a Simulink model. I want to publish some topics using ROS2. I added some topics in different place of the model, one of them is at depth 1 from the main system and the rest are at depth 5-6 from the main system (as shown in the 2 images). When I use ROS Logger to create a ROS bag, it only show the one topic at depth 1. I have chosen "Log Selected Signal" to all of the Topic. I am not sure if subsytem depth is the reason, but I need to create a log file for all topics. There is a same discussion, but no solution is shown there.

Depth 1 topic:

Depth 5 topic:

Can you suggest the solution?

Answer 1

[Josh Chen]

Hi Tai,

Messages from nested subsystems should be visible in the ROS Logger App.

I created a dummy model with 6 layers of subsystems, and was able to see all ROS signals from subsystems, no matter they were marked as logging or not.

If this happens on your end, I believe there should be another reason. Can you share a simplified model so we can look closer and identify the culprit?

If this is confidential, please feel free to reach out to our technical support team.

Thanks,

Josh

[Tai Hoang]

Hi Josh, thank you for your response. Do I share the (simplified) model straight in this thread or somewhere else?

[Josh Chen]

Hi Tai,

If the model is not confidential, you can share in this thread. Otherwise, you can reach out to our technical support team and they will send you a link to share.

Thanks,

Josh

[Tai Hoang]

Dear Josh,

I think it is better to continue with my problems here. When I selected the topics to be logged and run the simulation. It shows 2 errors as below:

Error due to multiple causes.

Caused by:

Error evaluating 'StartFcn' callback of block_diagram 'mySimulation'.

Callback string is '

% Do not delete, this is an auto-generated function to log ROS 2 message.

ros.slros.internal.ROSUtil.loggerStartFcn(bdroot)'

Dot indexing is not supported for variables of this type.

Error evaluating 'StopFcn' callback of block_diagram 'mySimulation'.

Callback string is '

% Do not delete, this is an auto-generated function to log ROS 2 message.

ros.slros.internal.ROSUtil.logROSMessageToBagFile(bdroot);'

Dot indexing is not supported for variables of this type.

I cannot find any related topic related to this error. Do you have any idea how to solve this?

Thanks,

Tai Hoang

[Josh Chen]

Hello Tai,

This is a general error message when Simulink bus parsing failed during logging process after simulation. I know there are few updates been submitted to address similar issues in the past. So I would suggest to upgrade to the latest version of MATLAB.

If that still not resolving the problem, please attach the model and we can take a look.

Thanks,

Josh