It sounds like you're encountering a common issue when working with custom messages in MATLAB's ROS Toolbox. The error message indicates that MATLAB cannot find the custom message definition for foo/foo_msg. Here are some steps to resolve this issue:
-
Check ROS Package Path: Ensure that your custom message package (
foo) is correctly sourced in your MATLAB environment. You can add the package path using theaddpathfunction:matlabaddpath('path_to_your_package'); -
Initialize ROS: Make sure you have initialized the ROS master in MATLAB using the
rosinitcommand:matlabrosinit; -
Verify Custom Message Definition: Ensure that the custom message definition for
foo_msgis correctly generated and available in your package. You can use therosmsgcommand in the MATLAB command window to list all available messages:matlabrosmsg list; -
Create Publisher: Use the
rospublisherfunction to create a publisher for your custom message:matlabpublisher = rospublisher('TOPIC', 'foo/foo_msg');
Here's a complete example:
% Initialize ROS
rosinit;
% Add package path
addpath('path_to_your_package');
% Create publisher for custom message
publisher = rospublisher('your_topic', 'foo/foo_msg');
% Publish a message (example)
msg = foo_msg(); % Create an instance of your custom message
send(publisher, msg);
Make sure to replace 'path_to_your_package', 'your_topic', and 'foo/foo_msg' with the actual values specific to your setup.
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