The status messages often do change between versions. A big example of this was when joints and axes were split up. The status messages changed quite a bit then. Multi spindle support was another biggie.  These were two big examples but there are plenty of other smaller changes that have affected the messages. You can pretty much guarantee every official release is different.

The messages won't change between successive compiles of the same version, as long as you compile on the same architecture. An x86 version is almost undoubtedly going to be different to an x64 version though.

Les


At the top you claim "Internally the data is represented by a tree of 
structures." and this is also what I found in stat_msg.hh file. I do not think this 
change between versions. It is common to have some kind of structure, CANopen and TCP/IP 
or UDP/IP have it. I do not think these structures are supposed to change between version 
or different compiles.



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