Plugin.BLE beta 5, GattCallback error: 133 from ConnectToDeviceAsync(IDevice)

Hi,

I’m using Plugin.BLE beta 5 for my project but I get an exception when I try to connect my phone to a BLE device.

Steps to reproduce

1. I scan for all of devices I can in a page DevicesListPage.
2. I choose the device I want to connect to and I passed it through a new Page, ServicesListPage, with that constructor : ServicesListPage(IDevice device). This page has a field, _connectedDevice. I set it in the constructor like this:

_connectedDevice = device

1. The page ServicesListPage has a button “Connect” to connecting my phone to the device _connectedDevice. When I click on the button the method Connection() is calling:

async void Connection(object sender, EventArgs e)
{
    if (_connectedDevice != null && _connectedDevice.State == Plugin.BLE.Abstractions.DeviceState.Disconnected)
    {
        try
        {
            await App.Adapter.ConnectToDeviceAync(_connectedDevice);
        }
        catch (DeviceConnectionException e){
            System.Diagnostics.Debug.WriteLine("EXCEPTION\nDevice : " + e.DeviceId);
            System.Diagnostics.Debug.WriteLine("Message : " + e.Message + "\nStackTrace : " + e.StackTrace);
        }
    }
}

Expected behavior

Connection should succeed.

Actual behavior

I got a DeviceConnectionException with this message

GattCallback error: 133

Crashlog

EXCEPTION Device : 00000000-0000-0000-0000-d03972ba4265 Message : GattCallback error: 133 StackTrace : at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00047] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter1[TResult].GetResult () [0x00000] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 at Plugin.BLE.Abstractions.Utils.TaskBuilder+<FromEvent>d__13[TReturn,TEventHandler,TRejectHandler].MoveNext () [0x000c0] in C:\Users\sead\Documents\GitHub\xamarin-bluetooth-le\Source\Plugin.BLE.Abstractions\Utils\TaskBuilder.cs:51 — End of stack trace from previous location where exception was thrown — at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00047] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /Users/builder/data/lanes/3415/7db2aac3/source/mono/external/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at BLETest.ServicesListPage+<ConnectionToDevice>c__async0.MoveNext () [0x0005a] in /Users/nbodinripert/Projects/BLETest/BLETest/Views/Pages/ServicesListPage.xaml.cs:105

Configuration

Version: Xamarin Studio 6.0 Xamarin.Forms : 2.0.1.6495 Plugin.BLE 1.0.0-beta5

Platform: Xamarin Forms (no specific code in iOS or Android sides) but I tested my app only on my Android phone.

Device: LGE Nexus 5X (API 23)

[SamuelLioult]

Hi, I had the same issue. I resolved it specifying the transport type to the ConnectToDeviceAsync method like this:

var parameters = new ConnectParameters(forceBleTransport: true);
await _adapter.ConnectToDeviceAsync(deviceToConnect, parameters, cancellationToken.Token);

Hope it helps.

[rcbolt3]

I’m getting the same exception on my Samsung Galaxy S8+ using both my app and your sample app. However, everything runs smoothly on my Samsung tablet and Note 3. Any ideas?