Droid NAS was updated to version 1.1 which adds password protection option. Screen will now always stay on while application in foreground. Google Play
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Droid NAS allows you to share folders over Wi-Fi network, making your Android device visible as Bonjour computer in Finder on your Mac. Turn your phone or tablet into wireless flash drive with a single tap! Different profiles can be used to quickly choose which folders to share. Assign your home or office Wi-Fi networks