Notification from app when the app is closed

[Justin_Desilets]

Hello all, new to the MIT app inventor.

I want to create an app that will make an alarm sound. In very short, i have a device (ESP32) that i am connected to by bluetooth. When this device sends the code “ALARM”, i want my app to make an alarm sound.

I have looked for Taifun extensions, but none of them will make the alarm sound even if the media volume is down. I have my alarms in android that do make the sound.

Also, if the app is closed, i won’t get the alarm sound at all (even if the volume is up).

Is there a way to make this with App Inventor?

Right now, i simply have an alarm sound that plays in the media like this:

Thanks for any help!

[Taifun]

@Justin_Desilets

have a device (ESP32) that i am connected to by bluetooth

Is this a BLE device or Bluetooth classic?
Look into the following example, which keeps s connection in the background while the app is closed

Another example about Itoo with classic BT and ESP32 (full-duplex, with watchdog and automatic restart)

Dear all, though this is not a completely new topic, I believe that it could be of some help, anyway, for those who need a step-by-step explanaition about the creation of an app capable of using the power of Itoo to run in background to manage a fast BT ful duplex communication. Moreover it shows how to restore the background communication after a failure. Tips and tricks to make it working are also described in the texts between the pictures. Credits to @Kumaraswamy for Itoo and @Taifun for …

Also look into the itoo thread for general background processing

Open Source • Background Tasks: Itoo

Itoo 4.5.0 Sky Github :heart_with_ribbon: Donate [BuildWithLove] [forthebadge] An efficiently designed virtual background execution environment for App Inventor. Powered by the ItooX framework. It allows you to run blocks in background the same way you do normally when the app is active. :star2: Please go through all the details and documentation listed below before you try to use the extension or seek help from others. Efforts have been made to be precise and simp…

@Justin_Desilets

make the alarm sound even if the media volume is down.

The settings extension is able to modify volume kevels

App Inventor Extensions: Settings | Pura Vida Apps

Taifun

[Justin_Desilets]

Thanks for the info, I will look into those and will report back if I have any issues!