Can't publish message from Simulink to ROS

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I am having trouble sending a message from Simulink to a ROS. The ROS master is running on a separate laptop which runs ROS kinetic on Ubuntu 16.04. When I echo the ROS topic on this laptop the message appears empty. The simulink model and empty message is attached below. Any help is much appreciated.

Accepted Answer

Abhijeet Gadkari
Abhijeet Gadkari on 6 Jul 2021
Edited: Abhijeet Gadkari on 6 Jul 2021
Hello Ben,
sensor_msgs/Joy is a ROS message that contains variable sized sub-messages.
As shown in the Modify maximum Size of Variable-length Array section of that example, you need to set the correct array-size of the Axes and Buttons fields for sensors_msgs/Joy.
Variable size sensor_msgs/Joy
In above snapshot, I've updated the Simulink model with 'Probe Width' blocks and assigned the width to CurrentLength field. In PuTTy window, echo of /joy topic shows message published from MATLAB.
-Abhijeet
  1 Comment
Ben Locke
Ben Locke on 7 Jul 2021
Hi Abhijeet
Thank you for your response, the model now works.
Best regards
Ben

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