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roslaunch use arg to launch serial_node.py

asked 2017-01-12 05:37:34 -0600

shawnysh
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I'd like to roslaunch serial_node.py node with launch file.

I add arg tag in launch file

<arg name="_port" default="/dev/ttyACM0" />
<arg name="_baud" default="9600/>"
<node name="serial_node" pkg="rosserial_python" type="serial_node.py" args="$(arg _port) $(arg _baud)"/>

But after I roslaunch the launch file, it fails. It seems like the two arg do not work at all

[ERROR] [WallTime: 1484219964.751265] Error opening serial: could not open port /dev/ttyUSB0: [Errno 2] No such file or directory: '/dev/ttyUSB0'

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answered 2017-01-12 08:14:02 -0600

jarvisschultz

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The serial_node.py node requires private parameters not command line arguments. You need to be using <param> tags instead of the args attribute. Check out the Examples section on the rosserial_python wiki page for an example of how to do this.

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Thanks for your help! It really helps!

shawnysh ( 2017-01-14 07:48:04 -0600 )edit

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Asked: 2017-01-12 05:37:34 -0600

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Last updated: Jan 12 '17

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roslaunch use arg to launch serial_node.py