Is there a software like ScreenWakeUp for an old iPad 1? Couldn't find on appstore
[EDIT] Jailbreak is an option.
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You won't find anything like this on the App Store, since…
It's a service that restarts on boot (Android permission
RECEIVE_BOOT_COMPLETED), which isn't possible on iOS without a jailbreak or without exceptions, and is disallowed on the App Store.
2.8 Apps that install or launch other executable code will be rejected
It'd run in the background all the time, which can't happen due to iOS restrictions, and is disallowed on the App Store.
2.16 Multitasking Apps may only use background services for their intended purposes: VoIP, audio playback, location, task completion, local notifications, etc.
It uses the Android permission
DISABLE_KEYGUARD which doesn't exist on iOS since apps can't bypass or interact with the system in that way.
2.6 Apps that read or write data outside its designated container area will be rejected
App Store Guidelines available at https://developer.apple.com/appstore/resources/approval/guidelines.html