Android Question BLE disconnect

Arnaud

Arnaud

Active Member
Licensed User
Longtime User
Hello,

I have tested the BLE 2 example (link below) for Android with 2 BLE device (RN4678 and Ebyte E104-BT40).

Location is enable, but when I try to connect, I receive "disconnect" result just few second after. This with android 7, android 8 and android 10.

When I try with the BLE scanner APP , it works fine.

Here the log unfilter to see the difference between B4A BLE example APP and BLE scanner APP :

Thanks for your help.

Code: 
-------------------------B4A APP------------------------------------

connect() - device: D8:80:39:F1:20:33, auto: true
registerApp()
registerApp() - UUID=bf470bf7-13de-43ef-b36b-d152d6289488
registerClient() - UUID=bf470bf7-13de-43ef-b36b-d152d6289488
onClientRegistered() - UUID=bf470bf7-13de-43ef-b36b-d152d6289488, clientIf=10
onClientRegistered() - status=0 clientIf=10
clientConnect() - clientIf =10, address=D8:80:39:F1:20:33, isDirect=false, transport = 0
btif_get_address_type: Device [d8:80:39:f1:20:33] address type 0
btif_get_device_type: Device [d8:80:39:f1:20:33] type 3
Unsupported transport for background connection
bta_gattc_init_bk_conn unable to connect to remote bd_addr:d8:80:39:f1:20:33
onConnected() - clientIf=10, connId=65535, address=D8:80:39:F1:20:33
onClientConnectionState() - status=133 clientIf=10 device=D8:80:39:F1:20:33
close()
unregisterApp() - mClientIf=10
unregisterClient() - clientIf=10
Disconnected



-------------------------BLE Scanner APP------------------------------------

connect() - device: D8:80:39:F1:20:33, auto: false
registerApp()
registerApp() - UUID=570619e6-f8f3-4b15-99b8-9a31d53e2b42
registerClient() - UUID=570619e6-f8f3-4b15-99b8-9a31d53e2b42
onClientRegistered() - UUID=570619e6-f8f3-4b15-99b8-9a31d53e2b42, clientIf=11
onClientRegistered() - status=0 clientIf=11
clientConnect() - clientIf =11, address=D8:80:39:F1:20:33, isDirect=true, transport = 2
btif_get_address_type: Device [d8:80:39:f1:20:33] address type 0
btif_get_device_type: Device [d8:80:39:f1:20:33] type 3
.....
Connected


[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
 
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Too less information for us to help you.

Where is your projectupload/Manifest/example code using Runtimepermission?
 
Upvote 0
Hello,

I use the same project as BLE2 example.

Please find the manifest and my project.

Code: 
AddManifestText(
<uses-sdk android:minSdkVersion="10" android:targetSdkVersion="29"/>
<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)
 

Attachments

Upvote 0
@f0raster0, thanks for your help

Have you tried the example without modifications?
Yes

(I'm almost sure you have a permission issue)
I use permission for fine location (please find screenshot in attachment)

also, using nRF APP, everything works?
Yes, it works fine (please find screenshot in attachment)


Code: 
'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="29"/>
<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)
 

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Upvote 0
chardenal said:
Hello,

I use the same project as BLE2 example.

Please find the manifest and my project.

Code: 
AddManifestText(
<uses-sdk android:minSdkVersion="10" android:targetSdkVersion="29"/>
<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)
Click to expand...
the file attached is not the example

try the example, and post the logs

[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

Have you tried the example without modifications?
 
Last edited:
Upvote 0
f0raster0 said:
the file attached is not the example

try the example, and post the logs

[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

Have you tried the example without modifications?
Click to expand...

Yes I have try with the example without modification, same result. Please find the UUID get with nRF, and the log.

Code: 
** Activity (main) Pause, UserClosed = true **
** Service (starter) Destroy (ignored)**
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
Found: , 59:A3:1C:9B:C7:BF, RSSI = -46, (MyMap) {1=[B@b0716ae, 10=[B@381dc4f, -1=[B@3850fdc, 0=[B@aa4f8e5}
Found: , 6C:97:96:7F:8A:4F, RSSI = -46, (MyMap) {1=[B@231efba, -1=[B@a29ee6b, 0=[B@c414dc8}
Found: , 03:C8:4E:63:FD:0B, RSSI = -44, (MyMap) {-1=[B@e313e61, 0=[B@bff4d86}
Found: , 72:00:41:EF:8E:00, RSSI = -92, (MyMap) {1=[B@f70647, 10=[B@f017e74, -1=[B@9e25f9d, 0=[B@ef2bc12}
Found: ALFANO-0BLE, EA:B6:0B:B7:3A:F0, RSSI = -47, (MyMap) {1=[B@a93bfe3, 2=[B@1f20de0, 9=[B@f8a5899, 0=[B@43c875e}
Disconnected
** Activity (main) Pause, UserClosed = false **
 

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Upvote 0
chardenal said:
Yes I have try with the example without modification, same result. Please find the UUID get with nRF, and the log.

Code: 
** Activity (main) Pause, UserClosed = true **
** Service (starter) Destroy (ignored)**
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
Found: , 59:A3:1C:9B:C7:BF, RSSI = -46, (MyMap) {1=[B@b0716ae, 10=[B@381dc4f, -1=[B@3850fdc, 0=[B@aa4f8e5}
Found: , 6C:97:96:7F:8A:4F, RSSI = -46, (MyMap) {1=[B@231efba, -1=[B@a29ee6b, 0=[B@c414dc8}
Found: , 03:C8:4E:63:FD:0B, RSSI = -44, (MyMap) {-1=[B@e313e61, 0=[B@bff4d86}
Found: , 72:00:41:EF:8E:00, RSSI = -92, (MyMap) {1=[B@f70647, 10=[B@f017e74, -1=[B@9e25f9d, 0=[B@ef2bc12}
Found: ALFANO-0BLE, EA:B6:0B:B7:3A:F0, RSSI = -47, (MyMap) {1=[B@a93bfe3, 2=[B@1f20de0, 9=[B@f8a5899, 0=[B@43c875e}
Disconnected
** Activity (main) Pause, UserClosed = false **
Click to expand...
I see, yes got similar issues (hard to connect and easy to unconnected) using that example with some modules don't remember how I solved that..

anyway can you please try using this example:

Connecting to Arduino with BLE (Bluetooth Low Energy)

In the previous example we broadcasted a single byte as part of the advertising data: https://www.b4x.com/android/forum/threads/ble-hm-10-module-broadcasting-a-single-byte.65785/ In this example the Android or iOS device (only one at a time) will connect to the BLE peripheral and read and write...
www.b4x.com www.b4x.com

you have to update the UUID with your ones
 
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