How does matlab send message to ros turtlesim

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I'm trying to use matlab to move the turtle in turtlesim, but it doesn't work.
The code is shown:
host = 'usr';
port = 11311;
rosinit(host,port)
vel_topic = "/turtle1/cmd_vel";
msg_type = "geometry_msgs/Twist";
velpub = rospublisher(vel_topic,msg_type,"DataFormat","struct");
msg = rosmessage(velpub);
msg.linear.x =1;
send(velpub,msg);
I don't get any error messages, but it doesn't work.

Answers (1)

Cam Salzberger
Cam Salzberger on 1 Feb 2022
Hello Gabriel,
If there is no communication between an external machine or VM and MATLAB over ROS, the issue is usually related to the environment on the external machine/VM. See this answer for details.
If that doesn't work, try to gather more information about what works and what doesn't. Does a subscriber on MATLAB receive messages from the turtlebot? Can you see nodes/topics with "rosnode list"/"rostopic list"? Can you do a "rostopic echo" on a different terminal on the turtlebot machine and send messages to it from MATLAB?
-Cam

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