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What is an md5sum?

asked 2012-11-11 22:02:35 -0500

Sanxano gravatar image

updated 2018-06-10 18:41:29 -0500

M@t gravatar image


Anybody could explain me what is exactly md5sum, and could tell me typical problems/solutions about this?


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answered 2012-11-11 22:25:44 -0500

Lorenz gravatar image

An md5 sum is a hash. Have a look at the wikipedia page. In ROS, it is used to verify that subscribers and publishers are using exactly the same message definitions, i.e. the md5 sum is computed from message definition files.

If you get md5 mismatches, then your messages are inconsistent. Make sure that you are using the same ros version on all computers and that you recompile all nodes if you change a message definition.

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Asked: 2012-11-11 22:02:35 -0500

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Last updated: Jun 10 '18