[BluetoothLEHelper] await services subscriptions

[GeertvanHorrik]

I'm submitting a...

• Bug report (I searched for similar issues and did not find one)

Current behavior

The services registration happens in ObservableBluetoothLEDevice.ConnectAsync. However, the services characteristics are being initialized in an non-async way in the service ctor.

Expected behavior

After await ConnectAsync, I would expect a fully available object (with services), which is not the case.

How to fix

My recommendation is to fix this by adding an Task InitializeAsync method to ObservableGattDeviceService. Then this can be called from within the ConnectAsync method and actually be awaited.

[marianstdt]

Hi @GeertvanHorrik I see you already investigated the fix for this issue, would it be possible for you to submit a PR with these modifications?

Thanks!

[GeertvanHorrik]

Unfortunately the toolkit no longer targets the version that supports mobile, so the interest is very low. But I might find some time in the near future.

[Omniflux]

For anyone waiting for a fix to this, here is an ugly work around...

int wait = 25;

await bleDevice.ConnectAsync();
while (bleDevice.BluetoothLEDevice == null)
    await Task.Delay(wait);
while (bleDevice.ServiceCount != (await bleDevice.BluetoothLEDevice.GetGattServicesAsync()).Services.Count)
    await Task.Delay(wait);
foreach (var service in bleDevice.Services)
    while (service.Characteristics.Count != (await service.Service.GetCharacteristicsAsync()).Characteristics.Count)
        await Task.Delay(wait);