ROS Subscriber in Simulink does not seem to receive data

Question

Angel Paredes 2021-7-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/881193-ros-subscriber-in-simulink-does-not-seem-to-receive-data

回答： Cam Salzberger 2021-7-19

I have connected Simulink on a computer, with ROS on another one through a tcp/ip interconnection using the ROS publisher and subscriber blocks. The connection is successful and I am able to send information to ROS through the publisher block.

The problem is the only way I have received data from the subscriber block is when I read data from the same topic I am writing (with the publisher block), all the other topics give a blank message despite I have done an "echo" on the PC running ROS and they are not empty.

I selected the topic source from the ros network and also tried to specify my own. Furthermore, I used a virtual machine before testing it on two diffetent PC's and have te same issue.

I am runing Matlab 2021a on Ubuntu 16.04 and ROS Melodic on Ubuntu 18.04.

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Answer 1

Cam Salzberger 2021-7-19

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https://ww2.mathworks.cn/matlabcentral/answers/881193-ros-subscriber-in-simulink-does-not-seem-to-receive-data#answer_750108

Hello Angel,

This is likely to be caused by the publisher on the ROS machine not having the ROS_IP environment variable set or set correctly. Please see this answer for details.

-Cam