Understanding messages MDSum

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Yes, I've read that line, it would be like this:

Header header   // Vector3Stamped
Vector3 vector
uint32 seq         // Header
time stamp
string frame_id
float64 x            // Vector3
float64 y
float64 z

But it's not working, so what am I doing wrong

Comments are stripped. Did you include those?

Also: Vector3 is not a primitive type. If I understand the explanation correctly, Vector3 vector and Header header should be replaced by the contents of those respective messages.

Trying the aggregation of the contents of Header and Vector3:

uint32 seq
time stamp
string frame_id
float64 x
float64 y
float64 z

At the MD5 calculator gives an incorrect hash too.

I'm trying all permutations I can imagine.... the "the MD5 text is concatenated with the MD5 text of each of the embedded types, in the order that they appear." can really be interpreted in many ways, at the very least, the documentation should provide some examples on how exactly is concatenated

I don't think it can be interpreted in many ways:

1. the md5 text is defined earlier in the text
2. it is + with the md5 text of the other msgs (ie: fields)
3. in the other that they appear: if you have md5_text of field a and of field b, you'd do md5_text(a) + md5_text(b)

this is the code that computes the "md5 text" for a given msg spec.

What md5_text(a) function does? it returns the hash as in "4a842b65f413084dc2b10fb484ea7f17" or it returns the list of compacted fields as in "float64 x float64 y ..." ? and, how the concatenated result of Vector3Stamped (or any other composited message) would look like?