Galaxy S4 bluetooth voice commands
See if Delayed Lock works for you. It's a 7-day trial app, with in-app purchase for license.


  Additionally, there is also an optional notification in the Android
  status bar and a widget to immediately reenable the lock screen, and
  free plugins to automatically keep the device unlocked while connected to a specific WiFi network / Bluetooth device or at certain
  locations.




Others have used a combination of Tasker and Secure Settings with this configuration:

Profile: State > Bluetooth Connected
Task &gt; Plugin &gt; Secure Settings &gt; Password/Pin &gt; Disabled

Exit Task:
Task &gt; Plugin &gt; Secure Settings &gt; Password/Pin &gt; Enabled (Set to my old
PIN number)