Microsoft Band 2 + UWP + Background Task => An error occurred while attempting to acquire the Bluetooth device service

2
votes

I'm writing a Windows 10 UWP app on my Surface Pro 3 which is connected to my Microsoft Band 2 and I can connect to it just fine when I'm running the app in the foreground.

But now I'm trying to use the DeviceUseTrigger and run some logic in a background task. When I call the method to connect to the band: 

var bandInfo = (await BandClientManager.Instance.GetPairedBandsAsync()).FirstOrDefault();
var bandClient = await BandClientManager.Instance.ConnectAsync(bandInfo);

I get the following error:

An error occurred while attempting to acquire the Bluetooth device service. This error can occur if the paired device is unreachable or has become unpaired from the current host.

I added the following capabilities to my UWP appxmanifest:

<DeviceCapability Name="bluetooth" />
<DeviceCapability Name="location" />
<DeviceCapability Name="proximity" />
<DeviceCapability Name="bluetooth.rfcomm">
   <Device Id="any">
     <Function Type="serviceId:A502CA9A-2BA5-413C-A4E0-13804E47B38F" />
     <Function Type="serviceId:C742E1A2-6320-5ABC-9643-D206C677E580" />
   </Device>
</DeviceCapability>

And this is my declaration of the background task:

<Extensions>
  <Extension Category="windows.backgroundTasks" EntryPoint="WindowsRuntimeComponent1.BandBackgroundTask">
     <BackgroundTasks>
        <Task Type="deviceUse" />
      </BackgroundTasks>
   </Extension>
</Extensions>
1
bluetoothwin-universal-appbackground-taskmicrosoft-band

1 Answers

0
votes

Just a guess, but does this paragraph from the Band SDK documentation possibly help with your call of GetPairedBandsAsync as well?

If your app wants to connect to the Band from the background, then the app should call GetBandsAsync(isBackground: true) to get a connection that will not interfere with any app that is running in the foreground and currently using a Band connection.