For something that is so rarely used through the night, it probably does not justify a quick access from a Main menu button. One level in is fine, as long as its location is intuitive and documented.
Perhaps a "Soft shutdown" item by itself in the Settings window, instead of lumping it together with the serial number of the ASIAIR.
Also perhaps change the Main menu icon for the Settings window from a WiFi icon, since the Settings window now has many more items than just WiFi setting. Perhaps a "gear" icon similar to the icon Apple uses for the IOS Settings.
If you follow iOS Settings, the ASIAIR serial number can go into the current "About" sub-window that is today represented by three big dots in ASIAIR. The Soft shutdown button and DC power management can go into a "Power" sub window of the Settings window, for example. The WiFi stuff and and IP numbers can perhaps go into a "Network" sub-window of the Settings window. Things like CPU Temperature and Undervoltage warning can go into a "Notifications" sub-window. Etc, etc.
You really need to design it from the top down, before more things get added and it becomes exponentially more confusing. A consistent interface is what makes iOS work well for people not used to computers.
It is definitely good to use Icons instead of words since ASIAIR is marketed to multiple countries. But when you place a shutdown button under the serial number inside a window that has a WiFi icon, that is when using icons becomes even more confusing.
Best regards,
Chen
