From Mi1S on 2017/11/02 22:15:23 +0000
Right now you guys are using some proprietary and paid app to integrate Mi Bands and can’t even support 1S because you can’t access the heart rate.
The open source project gadget bridge: https://github.com/Freeyourgadget/Gadgetbridge supports constant rate monitoring with the 1S and many devices already and is completely free. I do not use the Mi Fit app and so cannot use the wearable tracking whatsoever.
Since the app is open source you can submit a P/R to them and have support in the next version quite easily.
Copied from original feature request: http://urbandroid.uservoice.com/forums/264867-sleep-as-android/suggestions/32116768-integrate-with-gadgetbridge