Can't publish message from Simulink to ROS

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Ben Locke
Ben Locke 2021-7-5
评论： Nupur 2024-3-18
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.

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Abhijeet Gadkari
Abhijeet Gadkari 2021-7-6
编辑：Abhijeet Gadkari 2021-7-6
Hello Ben,
sensor_msgs/Joy is a ROS message that contains variable sized sub-messages.
There is a documented example for working with ROS messages of variable sizes from Simulink.
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
  2 个评论
Ben Locke
Ben Locke 2021-7-7
Hi Abhijeet
Thank you for your response, the model now works.
Best regards
Ben
Nupur
Nupur 2024-3-18
Hi @Abhijeet Gadkari I want to publsih ros2 message trajectory_msgs/JointTrajectoryPoint with positions [x1...xn, y1....yn] at each time step for example at time(t1) publish [x1...xn,y1...yn], at time(t2) publish [x1...xn, y1...yn] and so on.
I tried your solution for my task however, as the positons with size [128*2] i am getting erros. I have attached the file. Thanks in advance.

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