feature request: "Custom connect times" [hh:mm] and "Connect time frequency" without time-shift (e.g. before and after work sync and for peer-to-peer network users ["Antox" and so on])

[toxtox]

BatteryFu works great for me.

BUT I miss one setting option since I played around with peer-to-peer instant messengers like Antox https://github.com/subliun/Antox . Unlike common non-peer-to-peer messengers messages are only sent when the sender AND the receiver are online. If the sender and the receiver are using BatteryFu it could be that the "Connect time intervals" are not the same and the messages will never be sent.

Further it would be great to have an option to set special times directly for synchronising (for example before and after work.

Therefore my suggestion is to have two additional options to set "Custom connect times" and a fixed "Connect time frequency":

"Custom connect times" could be a list of times with the time format hh:mm (like "night mode") (advantage: irregular intervals are possible [for example sync before work 7:15 am and sync after work 5:15pm] and it is easy to understand) AND "Connect time frequency" as predefined intervals from which you could choose: "every full 15 minutes" "every full 30 minutes" "every full hour" (for frequencies longer than one-hour you need a fixed reference (for example "midnight") in order to get fixed defined times and the frequency must be a factor of 24hours.[if not you would have different you will have different connect times the next day]) "every 2 hours relative to midnight" "every 3 hours relative to midnight" "every 4 hours relative to midnight" "every 6 hours relative to midnight" "every 12 hours relative to midnight"

In the section "TIME SETTINGS" actually you have two options: "Sleep time" and "Connect time". Here you could add a third and fourth option called "Connect time frequency" and "Custom connect times hh:mm"

"TIME SETTINGS"
Connect time frequency (or interval)
Custom connect times hh:mm
Sleep time (frequency or interval)
Connect time (duration)

There will be no conflicts between the three options "Connect time frequency", "Custom connect times" and "Sleep time". If one of the first two options is active, the "Sleep time" is interrupted or delayed. The "Connect time (duration)" will be the same for all three options above.

I hope my description was not too complicated. Sorry for my long issue/feature request and thanks for reading it.