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Is Header required in a message?

asked 2014-02-28 02:10:02 -0600

veger gravatar image

http://wiki.ros.org/msg states:

The special nature of Header is mainly for historical reasons, such as preserving recorded data.

Does this mean that for newly created messages this field should/must omitted? Or should I still include it (to have normal/full functionality)?

I guess my question actually is: What is this Header type and why do I need it?

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answered 2014-02-28 02:35:13 -0600

dornhege gravatar image

updated 2014-02-28 02:35:48 -0600

Short answer: Include a Header in your message iff you need a header.

Longer answer: Header contains standardized information like a time stamp and frame id for TF. If your messages is of a nature that requires such things, it is good practice to use the standard Header instead of producing such things by yourself. If your message does not need such information, you don't need a header.

The special nature is that ROS classes might handle a message with header slightly different. There is the old seq id that is automatically incremented by publishers. In all other cases publishers do publish exactly the message you give them.

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Asked: 2014-02-28 02:10:02 -0600

Seen: 574 times

Last updated: Feb 28 '14