aioble: Unhandled exception in IRC callback - memory allocation failed

Hi,

I have a function that scans for advertising data and decode the information (Ruuvi temperature sensors). However, when this runs for a while together with some other tasks, I'm running into a memory issue.

Unhandled exception in IRQ callback handler
Traceback (most recent call last):
  File "core.py", line 71, in ble_irq
  File "central.py", line 61, in _central_irq
MemoryError: memory allocation failed, allocating 2048 bytes

This will quit my background BLE scanning task which is updating my temperature data. Of course I can watch the task and restart it, but I hope for a better error handling the the aioble library.

It runs fine for quite some time before it giving the error. It's not reproducible - sometimes it occurs after 5 minutes, sometimes it runs 2h without any issues.

I tried running an exception catcher around the can itself:

        try:
            async with aioble.scan(duration_ms = duration, interval_us=30000, window_us=30000, active = True) as scanner:
                self.scanner = scanner
                async for result in scanner:
                    self._handle_advertisement(result)

        except Exception as e:
            print('!!!!! Exception in aioble scan')
            print(e)

But this doesn't help to prevent the error from happing. Of course I could change the code in central.py myself and see if I can catch the error, but I don't want to mess around with it (yet).

I already have another task that is frequently running a gc.collect() and memory shows up with round 32kB.

Thanks....

Start with core.py line 71 and central.py line 61, the IRQ callback path shown in the traceback. Run the long-lived aioble.scan workload with the other tasks and observe how MemoryError affects the scanning task. Done means the desired behavior for allocation failure is defined and verified without silently stopping the background scan.