scanner status on WinRT backend

[aliencaocao]

Hi all, is there a replacement for the status attribute of the new WinRT backend? I am following the official doc but that was only for dotnet backend, and now when I try to access the status attribute of the scanner, it give me 'BleakScannerWinRT' object has no attribute 'status'.

Basically, I need to stop the scanning process and the scanner the moment it found any device or encountered any error (to be more exact, get the code to continue executing after the loop.run_until_complete(run()) since it is blocking if the run coroutine does not end) and at the same time give it a timeout of 5seconds so that it stops after 5seconds of finding no device at all. My current approach is using a while loop that checks the status of the scanner, which is no longer possible after WinRT is implemented. Any suggestion on how do I do this now?

What I have currently (which is not working):

        async def run():
            async def early_stopping(_, _1):
                await scanner.stop()
                self.passed = True
            scanner = BleakScanner()
            scanner.register_detection_callback(early_stopping)
            await scanner.start()
            while scanner.status not in [3, 4]:  # no longer working in WinRT
                pass
        import asyncio
        loop = asyncio.get_event_loop()
        try:
            loop.run_until_complete(run())
        except Exception as e:
            logger.error(f'Bluetooth scanning test failed due to error: {e}')
            self.passed = False

[dlech]

You could try https://github.com/hbldh/bleak/blob/develop/examples/scanner_byname.py. You can replace the lambda filter function with something that makes sense for your device if matching by name is not suitable.

[aliencaocao]

Maybe I didn't phrase it properly, but what I meant was the moment it found any device, it stops. Not a particular one and I have no requirements for whatever it finds.

[aliencaocao]

As for your suggestion, it gave me error: 'NoneType' object has no attribute 'stop'

[dlech]

It would be best to not access the OS-specific internals of Bleak. The code you gave never calls scanner.stop() so seems expected that scanning would never stop. The example I linked takes care of this for you automatically with much less code that you have to write yourself.

[aliencaocao]

The code i gave have a callback function that includes await scanner.stop(), but that callback fails to trigger at all. I switched it to simply printing device rssi per documentation's example and nothing would be printed.
The reason why I have to access the status is I need a while loop to act as a blocking code for the program to wait till it found any device, else it would just continue to execute no matter what.

[aliencaocao]

I am not sure how do I implement something like a timeout with your example. For the while loop method I used, I could have a timer started and inside the loop checks for the time delta, when it reaches the timeout, it will simply break the loop

[aliencaocao]

For the callback issue: I figured out that it was due to my while loop being inside the async run() function. The moment I remove it, the callback works. However I am still not sure why would it not work if I have the while loop there. I already called await scanner.start() before the loop so it should already be scanning.

[dlech]

find_device_by_filter() has a timeout argument.

docs: https://bleak.readthedocs.io/en/latest/api.html#bleak.backends.scanner.BaseBleakScanner.find_device_by_filter

[aliencaocao]

Ahhh sorry silly me did not check the doc for that function...
I just did a test run and it works as I want it to be, thank you for the prompt replies and sorry for taking up for time!