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I never got the Multiline part to work either. The only way I figured th send multiline strings using rostopic pub is to make a file like such:

"first line

I never got the Multiline part multi-line pub to work either. The only way I figured th out how to send multiline strings using rostopic pub is to make a file like such:this (named test.txt):

"first line

second line

third line"

I never got the multi-line pub to work either. The only way I figured out how to send multiline strings using rostopic pub is to make a file like this (named test.txt):test.yaml):

"first line

second line

third line"

and then use rostopic pub /send_BTSVR std_msgs/String -f test.txttest.yaml

Note that there is an empty line between the lines. I am pretty sure there's an easier/better way, but I don't know it and would love to hear if anyone has an idea?