feat: simple bluetooth device low battery notification

[versenilvis]

Preview

This is my personal style, you can change it

Why?

• We use bluetooth devices like keyboard, mouse, airpod, ...
• It would be very bad user experience if our device run out of battery without notification
• So I see that ambxst shows bluetooth devices' battery, I made a simple noti sender when it drops to 15% and 5%

What changed?

Note

• Battery low notification - only send once per threshold crossing
• Only notify at 5% if not already notified and battery is 5% or below
• Only notify at 15% if not already notified and battery is between 6-15%
• Reset flags when battery goes back up
• Some devices might keep polling, I had handled to send only one time, the notification won't keep pop-up

• It's not only send when it drops to 15% and 5%
• I added flag notified15 and notified5 when you haven't get any notification about your bluetooth device battery
• Imagine this, you open your PC, but your bluetooth keyboard is now at 4%, if we don't send notification at this time, it will shutdown anyway and we don't even notice this, you don't want to find the charger while enjoying the thing you do
• After changing above 5% and 15%, these two will be reset

Important

• Not all devices have battery info sending feature
• Look below, it's showing my mouse is at 100%, but no, it's not
• Depends on the hardware, some don't come up with this feature