I am currently prototyping an iOS iPad app for my company. Before I go in the details of what I am trying to do, this will be an enterprise app deployed by a local MDM. All the iPads that will have the app installed are supervised with a mobile config that allows the app to be in autonomous single app mode. So far, everything is working fine. The iPads are not (and cannot) be jailbroken.
I am looking for a way to basically switch the app to the foreground whenever the iPad is unlocked. I am aware of this thread (ios open app after screen unlock) from 2013, and I am hoping that 5 years later a solution has popped-up. Since our app is an enterprise app, it does not have to respect the app store requirements. I can successfully detect lock events if the app is opened when the device is locked, but when the app is not in the foreground, I would need it to be awaken from an iPad event.
The basic idea is that whenever the iPad would be unlocked, the app would freeze the iPad in single app mode, and the user need to perform some action inside the app to "reenable" the iPad and disable single app mode. If a user can re-lock the iPad and bypass the app (even if he successfully accessed it once) it's a no-go for us.
Edit
I am trying to awake the app after the unlock of the device. Basically once the iPads is unlocked (after pressing the home button) the app would be started automatically.