Fix for notifications not being sent to your Fitbit device when Do Not Disturb mode is enabled.
This is an Xposed module that spoofs the response of the Fitbit app's Do Not Disturb checks, so that you will always get notifications on your Fitbit.
Install Xposed and then install the most recent release here.
By default, the Fitbit Android app won't push notifications to your Fitbit if DND is enabled, which means that on AOSP, you can't get notifications unless your phone is set to at least vibrate.
This doesn't make sense to me, because I don't need my phone to vibrate if my Fitbit does. Most Fitbit devices also have their own DND mode, so I don't see why you wouldn't just use that if your device has one. (sorry Alta HR!).
I'd be thrilled if Fitbit made an official quick settings tile.
Your bluetooth stack is probably awful then. Most Android devices seriously mangle bluetooth.
This isn't made/endorsed/owned by Fitbit in any way.