Hello Taifun,
Thank you for your quick reply, your suggestion sounds very interesting and, I guess, the only feasible solution.
Here below the blocks of my app:
I believe it is worthwhile to explain a bit more of the history of my app.
The app was originally written to work in background mode by App Inventor Services. It worked like a charm, then App Inventor Services has been eventually shut down (App Inventor Services: this "services" service is obsolete - #5 by Salvatore_Oliva). However, I still have both aia project and apk files of my original app. Now I am in need to put my hands on the app to make it work on Android 15 (apk file is prevented from installing), but unfortunately I am no longer able to look at the blocks of my original app. I somehow succeeded in recreating and making the app run in foreground, now I would like to convert it to run in background by Itoo extension.
As you can figure, the modification involving global variables refactoring turns out to be quite heavy, since there are a lot of information getting around by them. On the other hand, as long as I acknowledge Itoo extension a very powerful and valuable project, caveat on global variables usage comes as a severe limitation.
I wonder if Kumaraswamy plans to modify and improve the extension in this sense. In the meanwhile, I will try to figure out how to modify my app as per your suggestion (it will be a lot of work!...).
Thank you again.