Re: CoreBluetooth in the Background (iOS)
Re: CoreBluetooth in the Background (iOS)
- Subject: Re: CoreBluetooth in the Background (iOS)
- From: Michael Kroll <email@hidden>
- Date: Fri, 31 Aug 2012 15:23:25 +0200
Ok, so I will try it again and leave my setup untouched over night ;-)
Regards,
Dr. Michael Kroll.
--------------------
Blog: http://www.mkroll.mobi
Forum: http://forum.mkroll.mobi
Sent from iPhone.
On 31.08.2012, at 15:04, Murad Kamalov <email@hidden> wrote:
> Hi,
>
> It seems to be working now, although scanning interval in background
> is extremely large. In my case it scans every 15 minutes (iOS 5.0.1).
> My BTLE chip advertises every 300ms, so based on what I've read in
> archive it should actually discover it in less than a minute. Maybe
> anybody had a similar problem?
>
> Basically the only thing I changed from the original code is queue
> parameter in original scan request from
> [[CBCentralManager alloc] initWithDelegate: self queue:
> dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)]
> to
> [[CBCentralManager alloc] initWithDelegate: self queue: nil]
> which should default to dispatch_get_main_queue(), so not sure if it
> actually made any difference.
> Probably I'll also try to run it on 5.1.1 later on, to check if
> background scanning interval is any better.
>
> regards,
> Murad
>
>
> On Fri, Aug 31, 2012 at 10:18 AM, m.kroll <email@hidden> wrote:
>> Hi Murad,
>>
>> I set the filters to match my devices primary service and it was still not
>> discoverable in the background :-(
>> There are two questions concerning CoreBluetooth which are still unanswered
>> for me:
>>
>> - The background discovery issue
>> - Which USB Dongle is supported by the iOS Simulator (when will it work in
>> ML again).
>>
>> Kind Regards/Mit freundlichen Grüssen,
>> Dr. Michael Kroll.
>> ---
>> Blog: http://www.mkroll.mobi
>> Forum: http://forum.mkroll.mobi
>>
>>
>> On Aug 31, 2012, at 09:15 AM, Murad Kamalov <email@hidden> wrote:
>>
>> Thanks András, I'll check the archives. As it seems so far thought,
>> event after 10 minutes of waiting phone doesn't discover BLE devices
>> in the background mode, but maybe it's related to scans' filtering
>> options.
>>
>> regards,
>> Murad
>>
>>
>> On Thu, Aug 30, 2012 at 5:10 PM, András Kovi <email@hidden> wrote:
>>> Hi Murad,
>>>
>>> Your app keeps working but discovery is 55 times slower and the peripheral
>>> filtering option of scan is discarded. If it takes 1 sec in foreground to
>>> discover in foreground, then it will take almost a minute in background.
>>> These issues have been discussed extensively on this list recently. It may
>>> be useful for you to search the archives for some answers.
>>>
>>> Regards, Andras
>>> Sent from the iPhone
>>>
>>> On 2012.08.30., at 16:00, Murad Kamalov <email@hidden> wrote:
>>>
>>>> Hi,
>>>>
>>>> I'm writing an app for iOS 5.1, which would connect to discovered BTLE
>>>> devices and read some data off them (BTLE devices advertise
>>>> proprietary Bluetooth service).
>>>>
>>>> Currently it works in the foreground mode, but I want to make it work
>>>> in the background mode. This should be possible with CoreBluetooth.
>>>>
>>>> Based on Apple documentation, I've added UIBackgroundModes key with
>>>> the "bluetooth-central" value in its Info.plist, but it doesn't seem
>>>> to be working.
>>>> Whenever I turn off the iPhone's screen or just put application into
>>>> the background, it just stops receiving CoreBluetooth discovery
>>>> (centralManager:didDiscoverPeripheral:advertisementData:RSSI:
>>>> callback) notifications and I can't discover/connect to BTLE devices
>>>> around. Do you have a guess what could be the problem?
>>>>
>>>> As I mentioned before in foreground mode application works just fine.
>>>>
>>>> Thanks for the help,
>>>> Murad
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