How can I receive sms while mobile screen is off at specific battery level reached?

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Use the battery manager extension App Inventor Extensions: Battery Manager | Pura Vida Apps together with itoo and the texting component

Here are 2 examples to study

  1. check battery in background
    Battery checker reminding you to unplug when fully charged - Tutorials and Guides - MIT App Inventor Community

  2. send sms in background
    [PAID] ⏰ Alarm Manager Extension with Notification or Autostart - #247 by Taifun - Extensions - MIT App Inventor Community

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