Android Question How to get information via BLE2

[lousoperscopimaligni]

I managed to implement the functions necessary for detecting bluetooth devices. now that my connection is successful, I'd like to understand how I can get the information I need to be sent. In my case, I should convert this JS function:

function RequestAudit() {
    Help("Caratteristica audit request " + uid_request);
    _service.getCharacteristic(uid_request).then(function (characteristic) {
        var cmd = "request";
        var cmdbyte = encEncoder.encode(cmd);
        return characteristic.writeValueWithResponse(cmdbyte);
    }).then(function () {
        $("#out").html("File requested");
    }).catch(function (err) {
        $("#out").html(err);
    });
}

while this is my B4A code for bluetooth connection:

Sub FAS_Scan
    Dim Permissions As List
    Dim phone As Phone
    If phone.SdkVersion >= 31 Then
        Permissions = Array("android.permission.BLUETOOTH_SCAN", "android.permission.BLUETOOTH_CONNECT", rp.PERMISSION_ACCESS_FINE_LOCATION)
    Else
        Permissions = Array(rp.PERMISSION_ACCESS_FINE_LOCATION)
    End If
    For Each per As String In Permissions
        Log(per)
        rp.CheckAndRequest(per)
        Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
        If Result = False Then
            ToastMessageShow("No permission: " & Permission, True)
            Return
        End If
    Next
    Log("Ricerco...")
    foundDevices.Clear
    bluetoothListView.Clear
    StartScan
End Sub

Sub Manager_StateChanged (State As Int)
    Select State
        Case blmanager.STATE_POWERED_OFF
            Log("POWERED OFF")
        Case blmanager.STATE_POWERED_ON
            Log("POWERED ON")
        Case blmanager.STATE_UNSUPPORTED
            Log("UNSUPPORTED")
    End Select
    StateChanged
End Sub

Sub Manager_DeviceFound (Name As String, Id As String, AdvertisingData As Map, RSSI As Double)
    If(Name <> "") Then
        Log("Trovato dispositivo: " & Name & ", " & Id & ", RSSI = " & RSSI & ", AdvertisingData " & AdvertisingData)
        Log("Nome dispositivo trovato: " & Name)
        Log("Id   dispositivo trovato :" & Id)
        Log("UUID dispositivo trovato :" & UUID(Id))
        ConnectedName = Name
        foundDevices.Add(Id)
        bluetoothListView.Add(CreateItem("BLUETOOTH", "bluetooth.png",Name & " " & Id),"")
    End If
End Sub


Public Sub StartScan
    If blmanager.State <> blmanager.STATE_POWERED_ON Then
        Log("Not powered on.")
    Else
        Log("power on")
        blmanager.Scan2(Null, False)
    End If
End Sub


Public Sub StateChanged
    If connected Then
        Log("Connected: " & ConnectedName)
    Else
        Log("Not connected")
    End If
End Sub

'Funzione che restituisce l'UUID completo del distributore FAS
Private Sub UUID(id As String) As String
    Return "0000" & id.ToLowerCase & "-0000-1000-8000-00805f9b34fb"
End Sub

Private Sub bluetoothListView_ItemClick (Index As Int, Value As Object)
    blmanager.StopScan
    Log(Index & " " & Value)
    Log(foundDevices.Get(Index))
    blmanager.Connect(foundDevices.Get(Index))
End Sub

 

[Erel]

You should never implement such code inside an activity.

Either move it to the starter service or (better) switch to B4XPages.
The relevant example is here: https://www.b4x.com/android/forum/threads/b4x-ble-2-bluetooth-low-energy.59937/#content
It shows how to read the peripheral data.