How does matlab send message to ros turtlesim

Question

Gabriel Silva 2022-1-28

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https://ww2.mathworks.cn/matlabcentral/answers/1638500-how-does-matlab-send-message-to-ros-turtlesim

回答： Cam Salzberger 2022-2-1

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.

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Answer 1

Cam Salzberger 2022-2-1

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https://ww2.mathworks.cn/matlabcentral/answers/1638500-how-does-matlab-send-message-to-ros-turtlesim#answer_886605

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