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Actually Ros has a parameter server that is nothing else as a Dictionary, parameter there has not type as you are specting...

so to the question: when you do:

$rosparam set /background_r "foo"

How you now it is failing? is not actually, you just wrote the parameter /background_r to "foo" in the dictionary

you can verify that by getting the value: just do:

$rosparam get /background_r

and you will get foo