Android Question BLE2 Cant Connect

fbritop

fbritop

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I´m using BLE2, it aws working fine, but on some update I think I miss something.

Is scans an returns the corrects MACs for the devices, when I try to connect to the one I'm interested, it just starts connecting and disconnects (never the connected state is called).

I was using an android app BLE Scanner, which correcty connects to the device, and I can see the device logs, that BLE is advertised on the app, but with B4A it never connects. I´m using the latest example from BLE2.

Is there something that I´m missing?
My device when I use BLE Scanner App throughs out this log, but with B4A nothing of this happens

1668117009442.png
 
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it could be the new permissions, the BLE example also didn't work for me until founding this:

[B4XPages] Bluetooth Chat Example

Updated implementation, based on B4XPages of https://www.b4x.com/android/forum/threads/android-bluetooth-bluetoothadmin-tutorial.14768/#content. The code is much simpler compared to the previous example. Note that you can call Serial.Listen without making the device discoverable. This is useful...
www.b4x.com www.b4x.com

new permissions in the manifest editor:
B4X: Copy 
AddPermission(android.permission.ACCESS_FINE_LOCATION)
AddPermission(android.permission.BLUETOOTH_ADVERTISE)
AddPermission(android.permission.BLUETOOTH_CONNECT)
AddPermission(android.permission.BLUETOOTH_SCAN)
 
Upvote 0
f0raster0 said:
it could be the new permissions, the BLE example also didn't work for me until founding this:

[B4XPages] Bluetooth Chat Example

Updated implementation, based on B4XPages of https://www.b4x.com/android/forum/threads/android-bluetooth-bluetoothadmin-tutorial.14768/#content. The code is much simpler compared to the previous example. Note that you can call Serial.Listen without making the device discoverable. This is useful...
www.b4x.com www.b4x.com

new permissions in the manifest editor:
B4X: Copy 
AddPermission(android.permission.ACCESS_FINE_LOCATION)
AddPermission(android.permission.BLUETOOTH_ADVERTISE)
AddPermission(android.permission.BLUETOOTH_CONNECT)
AddPermission(android.permission.BLUETOOTH_SCAN)
Click to expand...
Thanks
it did not work, still pushing!
 
Upvote 0
fbritop said:
This is my modified version
Click to expand...
I did a quick try and I can connect to my hardware BLE, but I had commented a couple lines, then I can't tell you where is the issue
Edit: If I don't comment those lines, I can't connect to my hardware.

B4X: Copy 
Sub btnScan_Click
    #if B4A
    'Don't forget to add permission to manifest
    rp.CheckAndRequest(rp.PERMISSION_ACCESS_FINE_LOCATION)
    Wait For B4XPage_PermissionResult (Permission As String, Result As Boolean)
    If Result = False Then
        ToastMessageShow("No permission", True)
        Return
    End If
'    rp.CheckAndRequest(rp.PERMISSION_ACCESS_COARSE_LOCATION)
'    Wait For B4XPage_PermissionResult (Permission As String, Result As Boolean)
'    If Result = False Then
'        ToastMessageShow("No permission", True)
'        Return
'    End If
   
'    Dim phone As Phone
'    If phone.SdkVersion >= 31 Then
'        For Each Permission As String In Array("android.permission.BLUETOOTH_SCAN", "android.permission.BLUETOOTH_CONNECT")
'            rp.CheckAndRequest(Permission)
'            Wait For B4XPage_PermissionResult (Permission As String, Result As Boolean)
'            If Result = False Then
'                ToastMessageShow("No permission...", False)
'                Return
'            End If
'        Next
'    End If
    #end if
    pbScan.Show
    StartScan
End Sub
B4X: Copy 
Sub Manager_DeviceFound (Name As String, Id As String, AdvertisingData As Map, RSSI As Double)
'    If Name.ToUpperCase.StartsWith("BLELM_10075") Then
'    If Id = "6D:D4:F2:0C:A4:74" Then
        '24:6f:28:aa:39:86
        Log("Found: " & Name & ", " & Id & ", RSSI = " & RSSI & ", " & AdvertisingData) 'ignore
        ConnectedName = Name
        'Dim data1() As Byte = AdvertisingData.Get(9)
        'Dim data2() As Byte = AdvertisingData.Get("0")
        'you can use byte converter to convert to hex if you like:
        ''Dim bc As ByteConverter
        'Log(bc.HexFromBytes(data1))
        'Log(bc.HexFromBytes(data2))
    manager.StopScan
   
        #if B4A
        Log("connecting")
        manager.Connect2(Id, False) 'disabling auto connect can make the connection quicker
    'manager.Connect(Id) 'disabling auto connect can make the connection quicker
    #else if B4I
    manager.Connect(Id)
    #end if
'    End If
End Sub
 
Upvote 0
Thanks but it did not work
If it helps, I´m trying to connect to an ESP32 that runs under Mongoose-OS
 
Upvote 0
If I try to uncomment those lines in your example, I also got this: "it just starts connecting and disconnects", then I think the issue is about permissions.

Can you try the example:

[B4X] BLE 2 - Bluetooth Low Energy

This library replaces the previous BLE library. It is simpler to use and it is more powerful. Its API is based on B4i iBLE library which makes it easy to reuse B4i code. See the iBLE tutorial: https://www.b4x.com/android/forum/threads/ble-bluetooth-low-energy-library.46099/#content Tips &...
www.b4x.com www.b4x.com

If I try the example it work for me.
I updated:

B4X: Copy 
'This code will be applied to the manifest file during compilation.
'You do not need to modify it in most cases.
'See this link for for more information: https://www.b4x.com/forum/showthread.php?p=78136
AddManifestText(
<uses-sdk android:minSdkVersion="5" android:targetSdkVersion="31"/>
<supports-screens android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
CreateResourceFromFile(Macro, Themes.LightTheme)
'End of default text.

AddPermission(android.permission.ACCESS_FINE_LOCATION)
AddPermission(android.permission.BLUETOOTH_ADVERTISE)
AddPermission(android.permission.BLUETOOTH_CONNECT)
AddPermission(android.permission.BLUETOOTH_SCAN)
 
Upvote 0
f0raster0 said:
If I try to uncomment those lines in your example, I also got this: "it just starts connecting and disconnects", then I think the issue is about permissions.

Can you try the example:

[B4X] BLE 2 - Bluetooth Low Energy

This library replaces the previous BLE library. It is simpler to use and it is more powerful. Its API is based on B4i iBLE library which makes it easy to reuse B4i code. See the iBLE tutorial: https://www.b4x.com/android/forum/threads/ble-bluetooth-low-energy-library.46099/#content Tips &...
www.b4x.com www.b4x.com

If I try the example it work for me.
I updated:

B4X: Copy 
'This code will be applied to the manifest file during compilation.
'You do not need to modify it in most cases.
'See this link for for more information: https://www.b4x.com/forum/showthread.php?p=78136
AddManifestText(
<uses-sdk android:minSdkVersion="5" android:targetSdkVersion="31"/>
<supports-screens android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
CreateResourceFromFile(Macro, Themes.LightTheme)
'End of default text.

AddPermission(android.permission.ACCESS_FINE_LOCATION)
AddPermission(android.permission.BLUETOOTH_ADVERTISE)
AddPermission(android.permission.BLUETOOTH_CONNECT)
AddPermission(android.permission.BLUETOOTH_SCAN)
Click to expand...
The permissions where already added in my project, but I still have no clue why it does not connect
 
Upvote 0
I did found finally a solution, which relies on BLE3, a modified version.
It is because of the transport issue.
Here is the link to the original post

BLE2 Library additional functions

I have started recently playing with a BLE devices. When I wrote B4A app to connect to them, I found out that I couldn't connect to the device. I have wasted 2 days, thinking that the problem is the device. I have modified firmware of the device, flashed to the device but not luck. Then I...
www.b4x.com www.b4x.com

Maybe @Erel could include this function (connect3) to the standard BLE library.

Cheers and thanks to everyone
 
Upvote 0
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