fitdump.pl message_index Support (text and JSON) about garmin-fit HOT 2 OPEN

The mask value (the least significant 12 bits of message_index, see Profile.xlsx in SDK) is indeed the index. It's used in SDK C code for locating a message in a file by specifying the global message number and message index. The selected bit is more interesting though - it would indicate the active user/bike profile in your example.

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Ok, that makes sense. Thanks for clarifying.

What I'm actually trying to do is translate the data available in the fitdump.pl JSON output, with a valid message_number+message_index combination for fitsed.pl. This would allow for my library to modify all of the values in a .fit like Settings.fit, including those with sub-indexes like bike_profile.

::EDIT: Making my question more generic and on topic ::

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