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Error opening LED device

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Stefano Dalla Gasperina
回答： Simon Ellwanger 2022-2-4
Hello,
I am trying to get started with ROSberry and Simulink. I was able to complete tutorial: Getting Started with Robot Operating System (ROS) on Raspberry Pi®, so that I was able to trigger led0 of Raspberry Pi via topic over ROS network.
However, I can't run the node as standalone node from ssh+rosrun etc etc.
I get an error: "Error opening LED device file led0." and the node can't start.
If I start the node via MATLAB "runROSNode" everything works like a charm.
Please help,
for me is very important to be able to start standalone ROS nodes from Pi board
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  2 个评论
MathWorks Robotics and Autonomous Systems Team
MathWorks Robotics and Autonomous Systems Team 2019-7-1
Sorry for the delay in responding, seems you are using a function which is not provided by MathWorks.
As we have "runNode"
https://www.mathworks.com/help/robotics/ref/runnode.html#bvf4xb6-7
Please confirm your workflow, and if needed please email the issue with proper steps to support@mathworks.com
Stefano Dalla Gasperina
Stefano Dalla Gasperina 2019-7-1
The problem was not due to runROSNode function, but I could not launch the compiled file from ssh directly from Raspberry's terminal.

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回答（1 个）

Simon Ellwanger
Simon Ellwanger 2022-2-4
on your raspberry check with
rostopic list
if your topic /led is in the ROS subscription list. If so, you will see
/led
that's why you cannot start it again. It's alreaedy running and should work. Try
rostopic echo /led
to see if your raspberry can receive from /led topic.

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