How to call a service with a char argument

Question

How do you pass a char to rosservice call?

I have a srv file like:

uint8 id
string data
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exposed as /myservice which I'd like to call like rosservice call /myservice m '!!str mydata' but this gives me a Python traceback to the autogenerated code for my srv class:

UnboundLocalError: local variable '_x' referenced before assignment

presumably because it doesn't convert "m" to the uint8 value 109. The docs declare char is deprecated because it's essentially the same thing as uint8.

Is there a way to explicitly declare this type, or do I have to pass in a literal int value?

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Originally posted by Cerin on ROS Answers with karma: 940 on 2016-03-13

Post score: 0

Answer 1

I am not familiar with the way you call the service. I usually do it this way

rosservice call /myservice '{id: A, data: ok}'

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Originally posted by Arowana with karma: 381 on 2016-03-13

This answer was ACCEPTED on the original site

Post score: 0

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Original comments

Comment by Cerin on 2016-03-13:
I tried that hash notation, but that gives me the error, "expected [id, data]. I guess it assumes a list notation for custom services?