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A comment on Under Armour dumped an app. Parent comment

Re:Under Armour dumped an app by nradov on Friday February 07, 2020 @01:00PM (#22268766)
The ANT+ protocol and FIT file format are sort of open. They are well documented and available to everyone. Multiple independent companies do contribute. But ultimately they are controlled by Garmin; they aren't true open standards like WiFi, TCP/IP, or HTML.

https://www.thisisant.com/

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Re:Under Armour dumped an app by ISL on Friday February 07, 2020 @01:41PM (#22269179)
Agreed. When I have tried to work with it [1], the format has been anything but open. It's been a mixture of other people's libraries and reverse-engineering to make Garmin files work for my needs.

There is an SDK with a license agreement that is probably more descriptive, but the license terms are not what one expects from measurement instrumentation.

[1] https://news.ycombinator.com/item?id=15825838

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