Fail to create ROS Publisher and ROS subscriber

Hi all,

I am creating subscriber and publishers for the turtle bot robot. For most topics, after using rosinit, I can create properly

publishers and subscribers. However, I fail to create a publisher for the /sound topic.

For instance, for topic cmd_vel I get:

r1=rospublisher('/cmd_vel')

r1 = Publisher with properties:

TopicName: '/cmd_vel'

IsLatching: 1

NumSubscribers: 0

MessageType: 'geometry_msgs/Twist'

It works perfect, but for topic sound I get:

r1=rospublisher('/sound')

Failed to create a publisher with topic name /sound and type turtlebot3_msgs/Sound.

Can anyone give me any hint about why this behaviour?

Thank you very much in advance,

Regards,

Ignacio

Answer 1

[Cam Salzberger]

Hello Ignacio,

The message type "geometry_msgs/Twist" is one of the standard, built-in ROS message types. However, the message type "turtlebot3_msgs/Sound" is a custom message type specific to the TurtleBot3. You'll need to make that message type available to MATLAB by building the "turtlebot3_msgs" package with the MATLAB Support Package for ROS Custom Messages.

-Cam