turn on screen only when necessary

[XXaorui]

considering adb shell input keyevent 26 = POWER_KEY,
it can be used to control screen for phones without screen lock.
furthermore, use input swipe/tap to simulate swipe/password input on lock screen.
so, seems like always-on screen requirement can be removed.

add a wrapper onto the hourly operation function, in the code implementation, right?

[gemfield]

This means program will lock & unlock screen every 30 seconds, right?