Unhandled Exception When Starting a Scan in New Development Environment using old Bleak and new pythonnet

[sigsstock]

• bleak version: 0.9.1
• Python version: 3.8.8
• Operating System: Windows-10-10.0.19041-SP0

Description

Sorry if this is the wrong place to post this but it gave me a lot of trouble figuring out so I'm hoping if some one runs into the same issue this might help them resolve it.

I've been working on setting up instructions for new users to setup the development environment for one of our tools for device configuration of out module via Bluetooth. From a fresh install of Python I got an unhandled exception error and a program crash when starting a scan. Placing scanner.start() in a try except block also results in the same exception.

What I Did

After some testing I found that version 0.9.1 seems to have a dependency on the version of pythonnet that was causing the issue. When setting up the new environment version 3.0.1 of pythonnet was installed vs mine which was at 2.5.2.

        scanner = BleakScanner()
        scanner.register_detection_callback(detection_callback)
        await scanner.start()

I've have started updating our for the latest version of Bleak but other priorities have slowed work on that and I also saw in the discussion that later version have moved to using bleak-winrt so it should not longer be an issue.

Logs

Unhandled Exception: System.NotSupportedException: Cannot create uninitialized instances of types requiring managed activation.
   at System.Runtime.Serialization.FormatterServices.nativeGetUninitializedObject(RuntimeType type)
   at Python.Runtime.ClassObject.tp_new_impl(BorrowedReference tp, BorrowedReference args, BorrowedReference kw)
   at Python.Runtime.NativeCall.Call_3(IntPtr fp, BorrowedReference a1, BorrowedReference a2, BorrowedReference a3)
   at Python.Runtime.MetaType.tp_call(BorrowedReference tp, BorrowedReference args, BorrowedReference kw)