Failed to create a ROS2 publisher

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Abhishek Bhagwat
Abhishek Bhagwat 2021-1-16
评论： Cam Salzberger 2021-2-12
Hello everyone,
I am trying to follow this example to create custom ROS2 messages: openExample('ros/ROS2CustomMessagesExample')
I ran the code in steps and it is successfully able to create a custom message using the command ros2genmsg.
After this, when I run the part of the code to create a ROS2 publisher, it gives me an error as seen in the image below
I have installed python 3.7 and the cmake version is 3.10.2. Any help is appreciated. Thank you for your time.
Regards,
Abhishek

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回答（1 个）

Hari Krishna Kakarla
Hi Abhishek,
You will not encounter this issue if use MATLAB R2020b or later. As a workaround, this can be resolved by specifying the LD_LIBRARY_PATH before creating the node:
setenv LD_LIBRARY_PATH <matlabroot>/extern/bin/glnxa64:<matlabroot>/sys/os/glnxa64
It should work fine after doing the above step and should be able to create publisher and subscriber. If you still see the same error, try doing this worksround:
Create a publisher on a default topic :
pub = ros2publisher(node,"/paramete_events")
Then create your publisher:
pub = ros2publisher(node,"/example_topic")
This should work, Hope this helps!
-Hari
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Abhishek Bhagwat
Abhishek Bhagwat 2021-2-12
Hello,
Thank you for replying. So I tried the following things and its still throwing the same error
  1. From Ubuntu terminal used - export LD_LIBRARY_PATH=/usr/bin to set the LD_LIBRARY_PATH to /usr/bin and then started MATLAB from the same terminal. Ran simulink it showed the same error.
  2. Also used setenv to set the LD_LIBRARY_PATH in MATLAB to /usr/bin.
  3. I was running MATLAB as root (sudo -i). Tried the non root way and my custom messages didn't appear in ros2 msg list (I had installed them starting Matlab as root). I installed them again properly and the simulink file still gave me the same error.
Is there any way I can schedule a zoom call to get this resolved. It would help me greatly.
Regards,
Abhishek Bhagwat
Cam Salzberger
Cam Salzberger 2021-2-12
You are always welcome to contact Technical Support to get direct assistance. It can certainly help in instances where the issue seems to be specific to your system's setup.
-Cam

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