Trusted devices has nothing to do with how long a connection is held...
I use it in my car, which has this bluetooth hands free system... It has never ever lost connection, because the phone actually sees a bluetooth headset.
Now, if you are transferring some files or something like that over BT, after the transaction is made, the BT will disconnect...
If you want to leave your phone unlocked under certain circumstances, I'd recommend other apps, such as:
- No Lock :
https://forums.androidcentral.com/e...ils?id=org.jraf.android.nolock&token=b-GJqqOj
Easy to use, has a widget that toggles modes... It does not work 100% on my moto x, but get the job done.
I say it does not work 100%, because some times while being unlocked, if you want to go into a hangout or something like that, it may ask you the unlock pattern... Not sure why...
- Trigger ( or some related ) -
https://forums.androidcentral.com/e...d=com.jwsoft.nfcactionlauncher&token=mwVL3xj_
I think that you can set a no lock scenario when connected to a wifi, or other triggers...