Apple

wrote:

> Interesting. In my testing they both trigger a pair, but maybe that's not intended?
>
> William
>
>
> On Wed, Apr 17, 2013 at 10:59 AM, Arvydas Sidorenko <email@hidden> wrote:
> > [peripheralManager respondToRequest:request withResult:CBATTErrorInsufficientAuthorization];
> William, it is CBATTErrorInsufficientAuthentication which triggers
> pairing on the central and not CBATTErrorInsufficientAuthorization.
>
> On Wed, Apr 17, 2013 at 6:44 PM, William Henderson
> <email@hidden> wrote:
> > I've tested the described caching behavior and can very that it works on iOS
> > 6.1.3 but does not on Mac OS 10.8.3.
> >
> > As mentioned above, caching happens only for paired devices. To pair, you
> > need to respond to a write request with an insufficient authorization error.
> > For example, for an iOS peripheral you would write something like:
> >
> > - (void)peripheralManager:(CBPeripheralManager *)peripheralManager
> > didReceiveWriteRequests:(NSArray *)requests {
> > ...
> >
> > [peripheralManager respondToRequest:request
> > withResult:CBATTErrorInsufficientAuthorization];
> >
> > ...
> > }
> >
> > That will pop up a pairing dialog on the iOS peripheral, after which point
> > you will be paired. Other than that you don't have to change your code –
> > just call discoverServices etc as normal and they will respond more quickly
> > (ie instantly).
> >
> > William
> >
> >
> > On Wed, Apr 17, 2013 at 3:17 AM, Etan Kissling <email@hidden> wrote:
> >>
> >> John,
> >>
> >> nope, i haven't tested caching / encryption yet.
> >>
> >> Etan
> >>
> >> On 17.04.2013, at 09:48, John Earl <email@hidden> wrote:
> >>
> >> Etan,
> >>
> >> This discussion seems to imply that discovered services and
> >> characteristics can be cached across disconnect/reconnect pairs if the
> >> application runs continuously in the background, so long as CBCentralManager
> >> does not power down.
> >>
> >> Have you tried this and/or do you use this functionality yourself?
> >>
> >> John
> >>
> >> On 17 Apr 2013, at 08:14, Etan Kissling wrote:
> >>
> >> Jack,
> >>
> >> In the mentioned session they explained that characteristics are only
> >> cached when encryption is on. I haven't tested whether this is true, but may
> >> be worth trying.
> >>
> >> To speed up characteristic discovery, consider lowering the connection
> >> interval for the first 30 seconds or so from your peripheral. You can do
> >> this by sending a connection parameter update request.
> >>
> >> Also ensure that all your services with 16-bit uuids are grouped at the
> >> beginning of your peripheral gatt database. This allows to read up to four
> >> 16-bit uuid services at a time with the default MTU of 23 bytes.
> >>
> >> Regarding serialization of cb* objects: it's not possible with public apis
> >> and even if you could serialize them for nsuserdefaults storage, you would
> >> still run into problems as the documentation clearly states that all
> >> peripherals etc are invalidated when the cbcentralmanager state falls below
> >> a certain level. When you create a new manager, state defaults to "unknown"
> >> which is the lowest level ;-)
> >>
> >> Cheers
> >> Etan
> >>
> >> On 17.04.2013, at 08:34, "Jack Phan" <email@hidden> wrote:
> >>
> >> Thank you very much for all your comments.
> >>
> >> Jack
> >>
> >> On Apr 16, 2013, at 11:28 PM, Andras Kovi <email@hidden> wrote:
> >>
> >> Well, if you retrieve or discover a peripheral, then its services will be
> >> nil. Those are read only from our perspective so there is not even a
> >> theoretical way to save and then restore the characteristics. Maybe they
> >> come up with some caching this year (WWDC 2013 hasn't happened yet to my
> >> best knowledge :) ) but I doubt that as that would introduce a whole bunch
> >> of issues. Rediscovery is not a big deal, you just have to plan for it.
> >>
> >> Cheers,
> >> Andras
> >>
> >> On 2013.04.17., at 8:09, Jack Phan <email@hidden> wrote:
> >>
> >>
> >> I may be wrong but I remember that in Advanced Core Bluetooth session from
> >> this years WWDC, they said we could catch the characteristics.
> >>
> >> Jack
> >>
> >>
> >> On Apr 16, 2013, at 11:06 PM, Andras Kovi <email@hidden> wrote:
> >>
> >> Yes, Khaos is right. You cannot save neither the characteristics or the
> >> services. They must be rediscovered every time.
> >>
> >> Andras
> >>
> >> On 2013.04.17., at 7:44, Khaos Tian <email@hidden> wrote:
> >>
> >> It seems you had to re-discover characteristics every time you established
> >> a new connection.
> >>
> >> Here are threads that discussed this problem previously.
> >>
> >> http://prod.lists.apple.com/archives/bluetooth-dev/2013/Mar/msg00032.html
> >>
> >> Best Wishes,
> >> Khaos Tian
> >>
> >> On Apr 17, 2013, at 1:25 PM, Jack Phan <email@hidden> wrote:
> >>
> >> The reason is that I don't want to scan again. I would like to reconnect
> >> but don't want to discover characteristics again because it takes too long.
> >> So when the user opens the app, I reconnect, no discover characteristics,
> >> but send characteristic values that I had saved to Peripheral.
> >>
> >> Jack
> >>
> >> On Apr 16, 2013, at 10:14 PM, Khaos Tian <email@hidden> wrote:
> >>
> >> sorry for the typo.
> >>
> >> I mean why don't you perform a discover characteristics action and then
> >> use that CBCharacteristic to perform action you want?
> >>
> >> Best Wishes,
> >> Khaos Tian
> >>
> >> On Apr 17, 2013, at 1:06 PM, Jack Phan <email@hidden> wrote:
> >>
> >>
> >> Hi Khaos,
> >>
> >> Yes. I would like to save CBCharacteristic *myChar into NSUserDefauts and
> >> then load it when user open the app.
> >> Thanks,
> >>
> >> Jack
> >>
> >>
> >> On Apr 16, 2013, at 10:02 PM, Khaos Tian <email@hidden> wrote:
> >>
> >> May I ask why would you like to say CBCharacteristic into NSUserDefaults?
> >>
> >> Best Wishes,
> >> Khaos Tian
> >>
> >> On Apr 17, 2013, at 12:56 PM, Jack Phan <email@hidden> wrote:
> >>
> >> Hi Group,
> >>
> >> I'm working on a project for iPhone (Central) with TI CC2541 (Peripheral)
> >> and would like to save a CBCharacteristic *myChar to NSUserDefaults but I
> >> don't know how.
> >> Please give me a way to solve this. It's great if you could share your
> >> code for it.
> >>
> >> Thanks a lot,
> >>
> >> Jack
> >> _______________________________________________
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> >>
> >>
> >>
> >>
> >>
> >>
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> >>
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> >>
> >>
> >>
> >>
> >>
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> >>
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> >>
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> >>
> >>
> >>
> >>
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> >>
> >
> >
> >
> > --
> > William
> > Sent from my iPhone
> >
> > _______________________________________________
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> >
>
>
>
> --
> William
> Sent from my iPhone

References:
	>Save CBCharacteristic to NSUserDefaults (From: Jack Phan <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Khaos Tian <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Jack Phan <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Khaos Tian <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Jack Phan <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Khaos Tian <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Andras Kovi <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Jack Phan <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Andras Kovi <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Jack Phan <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Etan Kissling <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: John Earl <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Etan Kissling <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: William Henderson <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Arvydas Sidorenko <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: William Henderson <email@hidden>)
	>Re: Save CBCharacteristic to NSUserDefaults (From: Etan Kissling <email@hidden>)