Bluetooth LE communication on win8

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C#

Windows

Bluetooth

hello,

my device uses bluetooth le 4 for communication.
although my device appears as paired in device manager, it's not assigned a port.

my developing enviroment: win8 visual studio 2015

i'm using DeviceInformation.FindAllAsync to locate my device,
but GattDeviceService.FromIdAsync fails.

var devices = await DeviceInformation.FindAllAsync(
GattDeviceService.GetDeviceSelectorFromUuid(GattServiceUuids.GenericAccess),
                new string[] { "System.Devices.ContainerId" });

            if (devices.Count > 0)
            {
                GattDeviceService svr = null;
                foreach (var device in devices)
                {
                    svr = await GattDeviceService.FromIdAsync(device.Id);

                }
            }

i specified the device capabilities:

<Capabilities>
    <m2:DeviceCapability Name="bluetooth.rfcomm">
      <m2:Device Id="any">
        <m2:Function Type="name:serialPort"/>
      </m2:Device>
    </m2:DeviceCapability>
  </Capabilities>

is there anything i should add?
is there a different way of accessing the problem?


thanks

What I have tried:

Tried using Microsoft Bluetooth Low Energy Functions unsuccessfuly