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Am am trying to send a string like
AT\r\n
to a modem through a String topic in ROS
I am able to do it in code but I can not do it in a terminal window
rostopic pub /my_topic std_msgs/String "data: 'AT\r\n'"
Is there a way to do this?
If you want \n to be translated into a newline, you can combine echo -e with rostopic pub
rostopic pub /my_topic std_msgs/String "$(echo -e "data: 'AT\r\n")"
s.macenski@reese:~$ echo $'\r'
s.macenski@reese:~$ echo '\r'
\r
Does the $ fix your issue?
Edit: I think you actually want \\ out instead. But you'd have to indicate specifically what issue you're having that you're looking to solve, its not necessarily clear to me, maybe I'm misreading what you're looking for
because its still your shell interpreting the return. Did you try it?
I'm suggesting trying 'AT$\r\n' but I'm not sure if it'll work, I was looking to you to tell me if that fixes it.
If not another option to try is double slash, ei 'AT<2 \>r<2 \>n' which should also potentially give you the viable solution
Asked: 2019-10-18 17:03:07 -0500
Seen: 777 times
Last updated: Jun 08 '23
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I have one terminal opened with
$ rostopic echo /fooand another where I do$ rostopic pub /foo std_msgs/String 'AT\r\n'. The first one receives, as expected:The same output can be achieved with
$ rostopic pub /banana std_msgs/String "{data: AT\r\n}"which is more similar to your syntax.This to say I don't think your issue is clear. Is it that you don't want the double backslash? Or you want the
\rand\nto be interpreted as carriage return?Yes I want the \r and \n to be interpreted as CR and LF