BLE list of devices

[Alfredo_Sanz]

Hello. I'm making an app that delivers a list of nearby BLE devices in a simple tag. But it doesn't work and I can't find the problem.When click Boton1 I get an empty list like []

Attached the blocks of the project. Thank you very much to those who can guide me.

[Taifun]

Welcome!
See here

BLE extension - Date Built: 2023-02-23 - permissions & connecting issuses on Android 12+

Quite a few users are currently having problems with the (new) BLE extension. Here is a test app. Test it on your devices and post screenshots before and after scanning and connecting. Location permission is requested automatically (so disable it before testing). [grafik] [grafik] EDIT: See also here:

Taifun

[ChrisWard]

The Device List is not produced instantly, you need to give the scan at least a second or two to find available devices - use a Clock Timer.

Can I ask why you are storing the entire List as a single Item in a Blocks List? It won't be retained when the App is closed.

[Alfredo_Sanz]

Hello CrisWard. Thank you for your answer. Do you mean that it is neccesary waiting at least a second before fill the list?
In connection with your question, my idea is to fetch "MICASA" string after the list is completed.
Regards,
Alfredo.

PS: I've never udes Clock block. I can't find where you can set the lapse. Is it configurable?

[Alfredo_Sanz]

Hello Taifun. Thank you for your answer. Later I will test these apps. But by now I need to solve the Appinventor + BLE issue, because this is the first step in a bigger project.
Greetings,

Alfredo.

[ChrisWard]

@Alfredo_Sanz

I've never udes Clock block. I can't find where you can set the lapse. Is it configurable?

It is - there is actually a nice tutorial showing how handy the Clock can be:

[Guide] How to use the CLOCK

Hello everyone, I have made a basic guide on how to use the clock component. Here, I will explain all the blocks associated to the clock component and a few sample projects which use the clock. 1.DESIGNER PROPERTIRES OF THE CLOCK 1.1Timer Always Fires This is a Boolean property, i.e it accepts only true or false. If you wish the clock to run even if the application is not the active screen, i.e the user is using some other application. Can this be set using blocks? Yes! By default: Tru…

It is not a good idea to start scanning when the Screen is initializing.

Here is a template Project, it does not deal with the Android 12 permissions but it shows how to use a Clock to give enough time for the App to find all available devices.

BLE_RECEIVE_STRINGS.aia (198.7 KB)

[Anke]

@Alfredo_Sanz

Later I will test these apps.

Have you tested the APK that @Taifun linked to (post #2)?
If so, let us know if it worked. If not, show us the screenshot.

[Alfredo_Sanz]

Hello CrisWard. Thank you for your advice, it was correct! It is neccesary to make a pause before starting to scan BLE devices.
Now in this version (it has some issues I couldn't solve yet) finally can search for a specific device using its name and verify if it is (or not) turned on.
I don't need to get a connection with the device, only to verify that it is "on air".
I will continue working on this and I will ask for help if I have new problems (that is sure...)
Thank You Very much.
Greetings

Alfredo.