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Why Empty message in std_msg?

asked 2019-05-26 16:27:10 -0600

Sparkle Eyes
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As in the title, I don't understand why is there an Empty type in std_msgs? What is it used for?

Thanks!

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answered 2019-05-26 18:04:29 -0600

stevemacenski

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It can be useful in situations where you don't particularly care about content of a message, but just that one has been received. Example: maybe a bump sensor would use an empty message because you just care that you hit something, there may be no other information available worth giving a client.

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Thanks Steve for the answer and the example!

Sparkle Eyes ( 2019-05-27 15:30:20 -0600 )edit

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Asked: 2019-05-26 16:27:10 -0600

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Last updated: May 26 '19

Why Empty message in std_msg? edit

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Why Empty message in std_msg?