How to subscribe to topics using ROS Support from MATLAB? [closed]

asked 2014-02-18 00:10:02 -0500

Àngel - IRI
74 ●4 ●4 ●13 http://www.iri.upc.edu/

Dear all,

I am testing the new ROS support from Matlab. I have the provided examples working without problems. Actually, the examples show how the subscribers work with messages published by the same matlab node (It also worked for me), but when I try to subscribe the matlab node to a topic from a c++ node, the Matlab code never calls the handle function though I see in rqt_graph the connection established.

You can reproduce this issue by using the basic_example in the previously posted link and changing the topic_name and topic_type in the subscriber definition to subscribe to an "external" node.

Please, does anyone found problems with this new and promising tool?

Thanks in advance.

Àngel.

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Closed for the following reason the question is answered, right answer was accepted by Àngel - IRI
close date 2014-04-18 00:04:06

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answered 2014-02-23 21:08:32 -0500

jaimerv
96 ●1 ●7 ●5

updated 2014-02-23 22:47:20 -0500

Hi Angel, i am dealing with the same problem. Apparently the communication between MATLAB and ROS is unidirectional http://www.mathworks.fr/matlabcentral... so MATLAB can communicate with ROS, but not the other way around. i am looking for some solutions, and so far i have found this https://alliance.seas.upenn.edu/~meam... but not sure if it will work,

Let me know if you find a proper solution, greets, Jaime

UPDATED: okey i found the solution. There is a difference when you lauch the roscore from terminal and when you do it from MATLAB. Following the next steps worked for me:

1) edit your .bashrc and add these lines:

export ROS_HOSTNAME=localhost

export ROS_MASTER_URI=http://localhost:11311

2) from terminal : roscore

3) now try again the communication with the subscriber from MATLAB. It should now work.

Greets, Jaime