Passive mode for scanning

[Centauri63]

Hello,
I have several BLE sensors and they send advertisement to any near device.
When I launch a scan my sensors send always an answer. My problem is the battery because it drain power. I'm interested in passive mode to avoid this problem.
But I didn't find how to use it. Could you help me ?or another solution?
I use this : scanner = BleakScanner(simple_callback,service_uuids)
Thanks and best regards.

[dlech]

Docs are here: https://bleak.readthedocs.io/en/latest/api/scanner.html#bleakscanner-class

[serpent213]

Still the basic questions remains: if 0x06 || 0x1a == True, I expect 0x00 || 0x01 || ... || 0x1f == True as well.

[dlech]

There is no bitmask, it has to match exactly,

[serpent213]

Sure, I understand. Maybe my pseudocode was a bit unclear. Actually I tried this:

bluez=BlueZScannerArgs(                                                                                                                                                          
   or_patterns=[                                                                                                                                                                  
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x00"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x01"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x02"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x03"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x04"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x05"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x06"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x07"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x08"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x09"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x0a"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x0b"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x0c"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x0d"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x0e"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x0f"),                                                                                                                          
                                                                                                                                                                                  
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x10"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x11"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x12"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x13"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x14"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x15"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x16"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x17"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x18"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x19"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x1a"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x1b"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x1c"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x1d"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x1e"),                                                                                                                          
     OrPattern(0, AdvertisementDataType.FLAGS, b"\x1f")                                                                                                                           
   ]                                                                                                                                                                              
 )

If I understood the Core Specification Supplement, Part A, Section 1.3.2 correctly, only bits 0–3 are used, bit 4 is deprecated. But anyway, 0x06 and 0x1a from your example are included, which on their own bring out lots of ads.

[dlech]

BlueZ may have an internal limit on how many patterns are actually allowed.

[serpent213]

Had a quick glance at the code and didn't notice a limit. Also the b"" approach should work, as the comparison is done using memcmp, which should return a match if length is zero.

Anyway, it's an experimental feature, so I guess I'm on my own – maybe I'll just switch to active discovery for now. Thank you for your work!