Re: [PATCHv2 0/4] Add support for bonding callbacks and retrying

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On Mon, Jan 30, 2012 at 1:51 PM, Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote:

>> > We have to also ensure that we do not disconnect the ACL in between the
>> > retry attempts. Otherwise some car kits might cancel their pairing
>> > procedure and you have to have user interaction to get it back into
>> > pairing mode. So if the ACL gets disconnect, then we should just fail
>> > and cancel the bonding.
>> >
>> In my testing, OS X/iOS drop the ACL between retry attempts - so we
>> wouldn't be any worse than they are. I'm not sure whether it's even
>> possible in bluez to avoid dropping the ACL?
>
> Is Apple doing retried pairing (or auto-pairing) as well?
>
They are; they send 0000 to the device, and then if it fails, it
retries after about 3s.

Android does the same (from the bluez Agent, ick)

> Strictly speaking the ACL disconnect is host stack triggered. So you
> have HCI_Authentication_Requested and you can just execute that again
> with the same link. We also do have a ACL disconnect timeout handling of
> 2 seconds that will allow sockets to re-use the same ACL link. Can you
> provide some hcidump traces from your test cases?
>
Sure, probably will be a few days though. I may have a play and see if
I can get it to avoid dropping the ACL link too.

Scott
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