rosserial "NameError: name 'client' is not defined"

asked 2020-10-19 08:52:21 -0600

Erikkk
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I am very new to ROS and Arduino, I am trying to use rosserial to realize the communication between my computer and Arduino. I can upload the program to Arduino successfully. But when I run rosserial_python,there is error:

ImportError: No module named queue

I changed import queue into import Queue in file SerialClient.py, then new error appear as:

[INFO] [1603106570.886915]: ROS Serial Python Node
[INFO] [1603106570.897550]: Connecting to /dev/ttyACM0 at 57600 baud
[WARN] [1603106570.900234]: Unexpected Error: <type 'exceptions.NameError'>
Traceback (most recent call last):

  File "/home/xiao/catkin_ws/src/rosserial/rosserial_python/nodes/serial_node.py", line 99, in <module>
    client.port.close()
NameError: name 'client' is not defined

So what is the problem here? how should I fix it? Thanks for any advice

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Add the relevant code please.

JackB ( 2020-10-19 11:57:53 -0600 )edit

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answered 2020-10-20 09:03:42 -0600

Erikkk
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The problem is solved by replace

import queue

by

import Queue as queue

The first time I just replaced queue with Queue but the remaining program is still using queue this is why the second error comes out.

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Hi,

I have the same problem, i replace import queue by import Queue as queue but I have the same error message.

Could you help, thank you

hyakoubi ( 2021-10-16 09:08:11 -0600 )edit

This is not a good fix. The better solution would be to use python2 like the developers intended. You can sometimes get away with using python3 in melodic, but it can lead to very puzzling errors if you ever modify this node in the future.