It is not clear from this page:-

https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble#passive-scan-for-nearby-devices-for-5-seconds-observer

how to use any of that code

>>> import l2cap_file_server
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "l2cap_file_server.py", line 53, in <module>
AttributeError: 'module' object has no attribute 'Service'
>>> 

we need to be told what to do to make it work, and there needs to be working examples to show the features - especially the "scan" - and the examples need to tell you what you need to to do run them.

even the multitests don't seem to work? (and there's no tests for the scan feature):

MicroPython v1.21.0 on 2023-10-06; Generic ESP32 module with OTA with ESP32

Type "help()" for more information.

>>> import notify
>>> notify.instance1()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "notify.py", line 148, in instance1
AttributeError: 'module' object has no attribute 'stop'
>>> 

disclaimer: I'm not an expert in MicroPython