Cannot Connect to ROS Master Running on Odroid XU4

Question

Andrew Poissant 2019-8-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/476458-cannot-connect-to-ros-master-running-on-odroid-xu4

回答： Andrew Poissant 2019-8-22

Annotation 2019-08-22 093955.png

I am trying to connect to the ROS master running on an odroid XU4. However, whenever I try to use rosinit, I get the error: "Cannot connect to ROS master at http://172.16.0.127:11311. Check the specified address or hostname." The Odroid XU4 is running Ubuntu 16.04. I set up a static IP address of 172.16.0.127, which is verified by running the 'infconfig' command. I also ran 'echo $ROS_MASTER_URI' in Ubuntu and get 'http://172.16.0.127:11311'. It seems that everything is set up properly but matlab can't establish connection? How do I resolve this issue?

Code Run in Matlab:

rosinit('172.16.0.127')

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Cam Salzberger 2019-8-20

Are you sure the port number is supposed to be 1131? The default is usually 11311.

Andrew Poissant 2019-8-22

编辑：Andrew Poissant 2019-8-22

Sorry, that was a typo on my part. I have 11311 as the port number. I updated the question. I also included screenshots showing my Windows computer (running matlab) pinging my odroid device (running ROS) at IP 172.16.0.127.

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Answer 1

Andrew Poissant 2019-8-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/476458-cannot-connect-to-ros-master-running-on-odroid-xu4#answer_388648

I found out you need to actively run ROS on the Odroid in order to be able to connect to it to matlab. After running the command 'roscore' in the Ubuntu terminal, I was able to connect via rosinit('http://172.16.0.127:11311').