![]() ![]() The binary format itself has only had on breaking change, and that was back in mid-2017. There are many open-source projects that support additional languages as well. Those example projects are generic and work with all FIT files, not just Activity files. If you do not want to use C#, each SDK has an example project for decoding FIT files. This project also writes out a CSV file, so if you want to customize the CSV file for your own needs this would be a good place to start. The recipes are written in C# but the concepts apply to each SDK. If your goal is not to get the data in to a spreadsheet application, but rather write your own application to perform the analysis, there is a recipe in the Cookbook for decoding FIT Activity files. For example, if you want to get a relative time offset from the beginning of the activity, then subtracting epoch values is more efficient than subtracting date time objects. But that depends on how the data is being used. Each SDK provides a Date Time class that handles the conversion from the FIT Epoch to a language specific date time object, and in many cases the developer does not need to work directly with the FIT Epoch values. ![]() In the FIT SDK Cookbook there is a recipe for working with FIT Epoch values, which coincidentally is the date that Garmin was founded. If you are on OSX, there is documentation on how to create an Automator app for running the FIT CSV Tool and shows the use of the “-data” option. If you are using Windows, there is a bat file “FitToCSV-record.bat” that runs the FIT CSV Tool with the “–data record” option. The tool is meant for debugging, but in the tool’s documentation there is an example showing the use of the “-data” option that will output a file with just the record messages, which is probably what you are looking for. If your goal is to get the data from a FIT file in to a spreadsheet application, then using the FIT CSV Tool is a good place to start. Garmin needs to pivot immediately to leverage their community and start pushing updates that make these devices useful and secure. They're indicative of a deeply flawed engineering organization. So what gives? How are people dealing with this? Has Garmin not learned their lesson? Security by obscurity is not an option, and these problems are not just surface-level frustrations. There's no excuse for any of this, as these bluetooth messages have no real data limitation, and the difference between a normal unix epoch at a timestamp_16 is all of 32 bytes (tops). Something? I still can't tell what they are relative to. Many data streams don't even use the correct field names, structure is malformed, conventions not followed, timestamps are unix epochs shifted by 20 years, except for timestamp_16s which are relative to. The protocol data is inexplicably confusing. See other threads in this forum with people making comments to the effect of "oh I guess they changed it so I'm looking through previous versions of the SDK to do so-and-so."Ĥ. ![]() These files have evolved over time, without documentation or logs, making utilities created by individuals as recently as 2018 completely useless (see ). Converting these FIT files requires use of a poorly documented SDK and command line tool.ģ. What end user could have any conceivable use for this?Ģ. Even though Garmin Connect does the conversion, and shows me a graph, I can only download the original FIT binary data. I couldn't just download CSVs of individual data timeseries. Nothing fancy, just want some basic data so I can correlate metrics like heart rate with another data stream.Īs a software engineer, every step of this experience has been horrifying.ġ. I am trying to pull data from an Instinct Solar for a little side project. ![]()
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