newky2k / dsoft.system.bluetoothle

Cross-platform Bluetooth Low Energy library, based on Plugin.BLE, for Xamarin.iOS, Xamarin.Android, UWP, Xamarin.Mac, .Net Core, TVOS(Preview) and WatchOS(Preview), Tizen(Coming soon)

Hi there, I'm Dave 👋

I've have been into coding since I was a kid, and I get to do my hobby for a job!

I have worked for The Access Group, Xamarin and Microsoft and am currently working for Evoke Systems. I am also working on RainyDay Backup, a backup system for Azure DevOps and Version Changer for Visual Studio, an addin for updating project version numbers.

When not working for money, I spend my time on my opensource projects like Cross-platform Bluetooth library, Cross-platform MVVM library, Web-API client library for JSON and gRPC and many others.

dsoft.system.bluetoothle's Issues

Access Denied When Executing "GetCharacteristicsAsync()" for Write Characteristic

Hi dude @newky2k ,

you are claiming that your library is supporting .NET Framework 4.6.1+.
Did you test your code running in a Win32 e.g. console application? If you did and it is working, maybe you can assist me because I have a serious problem when trying to get the write characteristics from our bluetooth LE device.

I show you inside your code what ALWAYS gives me GattCommunicationStatus.AccessDenied:
You are using: var result = await NativeService.GetCharacteristicsAsync(BluetoothLE.CacheModeGetCharacteristics); in your GattService (https://github.com/newky2k/DSoft.System.BluetoothLe/blob/master/DSoft.System.BluetoothLe/Service/Service.uwp.netcore.netf.cs).
There is another method you can call to directly get a known characteristic, so we use:
var result = await NativeService.GetCharacteristicsForUuidAsync(uuid, BluetoothCacheMode.Cached);
This works when getting the read characteristic but ALWAYS gives result.Status == GattCommunicationStatus.AccessDenied when getting the write characteristic.

If I use the same method as you (NativeService.GetCharacteristicsAsync(BluetoothLE.CacheModeGetCharacteristics)), it also fails with GattCommunicationStatus.AccessDenied.
But the call var accessRequestResponse = await NativeService.RequestAccessAsync(); ALWAYS returns DeviceAccessStatus.Allowed.

I also asked those questions at stackoverflow, within discussions of Shiny library and in the Developer Community of Visual Studio.

If you have ANY hint or advice, I would really appreciate it!

Kind regards,

Mathias Hartner

While using DSoft.System.BluetoothLe plugin for UWP project: Calling UpdateRssiAsync and then reading device Rssi value returns 0

Calling UpdateRssiAsync and then reading device Rssi value returns 0, code below works just fine for Android but for UWP it always returs 0
if (await device.UpdateRssiAsync())
{
Debug.WriteLine("The new rssi value is: {0}", device.Rssi);
}

For UWP Project: Bluetooth State always ON

While running WUP app, disable on board blue Tooth Get state as so:
Run code below , state will be on, StateChange even will never get triggered :

var ble = CrossBluetoothLE.Current;
....
var state = ble.State;
.....
ble.StateChanged += (s, e) =>
{
Debug.WriteLine($"The bluetooth state changed to {e.NewState}");
};

wpf ConnectToKnownDeviceAsync NullReferenceException

DeviceFoundAsync spuriously throws an Exception

This does not happen all the time, but rarely. Looks like a race condition for me:

Stacktraces I managed to capture:

Message: Value does not fall within the expected range.

at System.BluetoothLe.Adapter.DeviceFoundAsync(BluetoothLEAdvertisementWatcher watcher, BluetoothLEAdvertisementReceivedEventArgs btAdv)\r\n   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_1(Object state)\r\n   at System.Threading.ThreadPoolWorkQueue.Dispatch()\r\n   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()

or

"Message":"Schwerwiegender Fehler (0x8000FFFF (E_UNEXPECTED))"

 at System.BluetoothLe.Adapter.DeviceFoundAsync(BluetoothLEAdvertisementWatcher watcher, BluetoothLEAdvertisementReceivedEventArgs btAdv)\r\n   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_1(Object state)\r\n   at System.Threading.ThreadPoolWorkQueue.Dispatch()

both seem to be thrown unobserved, which makes catching them difficult.

I do not have more stacktraces atm, this mangled stuff comes from our error reporting system.

Will this library run on linux systems?

I want to implement a BLE service between my raspberry pi running ubuntu and android phone. I was curious if I can use this library or if I will need to use https://github.com/phylomeno/dotnet-ble-server for linux.