Return Handle from callableBlueprint

Development Programming & Scripting
1

Hi,

I am programming a bluetooth low engergy plugin right now. I already got a hard programmed connection to my heart rate monitor working, but now I want to make it more flexible.
For some reason I get a compile error, when I have a function that returns a HANDLE.

my .h file:

    UFUNCTION(BlueprintCallable, meta = (DisplayName = "Return handle", Keywords = "BLE handle"), Category = "Bluetooth LE")
    		static HANDLE returnHandle();

my .cpp file:

HANDLE UBLEBPLibrary::returnHandle()
{
	HANDLE test = NULL;
	return test;
}

When compiling Visual Studio throws the following error:
OtherCompilationError (5)

This doesn’t help me in any way. Any Ideas?

Thanks for your Help!