Allow a different NFC tag for different alarms

From Joe Palmer on 2016/10/19 14:08:54 +0000

Allow specific NFC tags to be used for each alarm, for instance allow one alarm to only be turned off by the nfc tag in my kitchen and another be only turned off by the tag in the bathroom

Copied from original feature request: http://urbandroid.uservoice.com/forums/264867-sleep-as-android/suggestions/16727533-allow-a-different-nfc-tag-for-different-alarms