How do download the past day's data (HR and step) from the band?

[askvictor]

Any pointers where I'd look to implement the ability to download the HR and steps data the band 3 has stored on it, along with timestamps? i.e. the same operation that a phone app might use when it 'syncs' data from the band?

I can set the band to collect HR data every X minutes using Gadgetbridge or Notify & Fitness, but I'm trying to make an easy way to download this data into a CSV.

[meyerben]

Take a look at https://github.com/creotiv/MiBand2
I was able to use a lot of his code to do almost exactly what you're trying to accomplish