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biemster / FindMy

Query Apple's Find My network
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strict use of status byte since 17.5.1? #53

Open humpataa opened 4 months ago

humpataa commented 4 months ago

The documents show the first 6 bits of byte 2 of the advertising string being reserved, only the last 2 can be used "freely" (e.g. for battery state):

status byte

I've been using byte 2 of the advertisement fully for my own purpose which never happened to be a problem. My phone has updated to 17.5.1 last night and today I see differences for faketags close to it. Exactly since updating iOS the status byte keeps being set to zero.

Interestingly the confidence byte also has dramatically changed exactly at the time of update: it shows values 4-5 times higher than before. Without tags or phone being moved a bit. Has anyone else noticed this?

Cassander313 commented 2 months ago

@humpataa I wonder if this is also causing the issue for tags to not get updates. I posted the issue here: https://github.com/biemster/FindMy/issues/55

Cassander313 commented 2 months ago

Also looks like there is another conversation that might be relevant: https://github.com/seemoo-lab/openhaystack/pull/250

Cassander313 commented 1 month ago

@humpataa were you able to figure out how to get around the issue you mentioned: "I've been using byte 2 of the advertisement fully for my own purpose which never happened to be a problem"

humpataa commented 1 month ago

I believe that beta updates of iOS (currently running 17.6.1) have fixed the problem. But I am using the status byte now according to the specification as shown above. Looking good.

Cassander313 commented 1 month ago

@humpataa have you been able to test the new IOS18? If so, have you noticed how it handles the status byte? Thank you for any insights. 🙏

humpataa commented 1 month ago

not yet, unfortunately

bobrippling commented 2 weeks ago

The documents show the first 6 bits of byte 2 of the advertising string being reserved, only the last 2 can be used "freely" (e.g. for battery state):

@humpataa do you have a link to that document?

humpataa commented 2 weeks ago

@humpataa do you have a link to that document?

unfortunately not, you'll need a developer account to get access to it