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rosrun rosserial_python serial_node.py

melodic

asked 2022-04-12 01:40:51 -0500

ahmet
1 ●4 ●8 ●9

I m use ros melodic , i try communication between my computer and Arduino , i get this error ;

*rosrun rosserial_python serial_node.py /dev/ttyUSB0*

[INFO] [1649419916.072500]: ROS Serial Python Node

[INFO] [1649419916.117295]: Connecting to /dev/ttyUSB0 at 57600 baud

[WARN] [1649419916.123987]: Unexpected Error: <type 'exceptions.nameerror'="">

Traceback (most recent call last): File "/home/petka/catkin_ws/src/rosserial/rosserial_python/nodes/serial_node.py", line 107, in <module> client.port.close()

NameError: name 'client' is not defined

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Where did you get the rosserial ros package from? When you build from source, you are responsible for installing the needed python pkgs.

Mike Scheutzow ( 2022-04-12 15:19:32 -0500 )edit

I get from http://wiki.ros.org/rosserial_arduino... , I didn't do any installation, I have no idea how to install python package.Can you help about this issue?

ahmet ( 2022-04-13 00:45:59 -0500 )edit

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answered 2022-04-13 07:14:50 -0500

Mike Scheutzow
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If you are new to ros, you should :

delete the source code directory rosserial from catkin_ws/src/
clean up broken catkin_make by deleting the catkin_ws/build and catkin_ws/devel directories.
follow the 2.1.1 setup instructions to install from the apt repository. apt will install the extra dependencies for you. In the example apt-get command lines, you need to replace indigo with melodic.