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Re: iPhones detecting each other in background
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Re: iPhones detecting each other in background

  • Subject: Re: iPhones detecting each other in background
  • From: Darren Jones <email@hidden>
  • Date: Sat, 09 Nov 2013 11:28:30 +0000
I see, so it’s the OS that’s broadcasting the peripheral, and it’s when I request a read of the characteristic that the restoration is made.
So the restoration might not be happening.

I just tested again, and on first scan it read the characteristic fine with this log:
Nov  9 11:06:25 Scotts-iPad BTLEServer[699] <Notice>: (Note ) Starting XPC server
Nov  9 11:06:25 Scotts-iPad BTLEServer[699] <Notice>: (Note ) PeripheralManager state is now powered on
Nov  9 11:06:25 Scotts-iPad BTLEServer[699] <Notice>: (Note ) Service "Unknown (<7905f431 b5ce4e99 a40f4b1e 122d00d0>)" has been published
Nov  9 11:06:25 Scotts-iPad BTLEServer[699] <Notice>: (Note ) Service "Battery" has been published
Nov  9 11:06:25 Scotts-iPad BTLEServer[699] <Notice>: (Note ) Service "Current Time" has been published
Nov  9 11:06:26 Scotts-iPad kernel[0] <Debug>: launchd[700] Container: /private/var/mobile/Applications/73A0C970-7697-41A9-AA68-9BB5CB9A83D5 (sandbox)
Nov  9 11:06:26 Scotts-iPad Bluetooth-Test[700] <Warning>: -[BTViewController viewDidLoad]
Nov  9 11:06:26 Scotts-iPad Bluetooth-Test[700] <Warning>: -[BTViewController peripheralManager:willRestoreState:]
Nov  9 11:06:26 Scotts-iPad Bluetooth-Test[700] <Warning>: -[BTViewController peripheralManagerDidUpdateState:]
Nov  9 11:06:26 Scotts-iPad Bluetooth-Test[700] <Warning>: -[BTViewController peripheralManager:didReceiveReadRequest:]
Nov  9 11:06:26 Scotts-iPad Bluetooth-Test[700] <Warning>: mainString:Scott
Nov  9 11:06:26 Scotts-iPad Bluetooth-Test[700] <Warning>: request.value:<53636f74 74>
Nov  9 11:06:26 Scotts-iPad Bluetooth-Test[700] <Warning>: Added Service
Nov  9 11:06:26 Scotts-iPad Bluetooth-Test[700] <Warning>: Error publishing service: Unknown error.

A second scan resulted in finding the peripheral, connecting to it, attempting to read the characteristic, but no logs whatsoever showing on the peripheral side and the unknown error as before.

Is there any boilerplate background peripheral code anywhere I can take a look at to double check that mine’s ok.

I’m using my sons iPad mini with 2 games called Gunner Z & Zombie Cafe that happily use all the memory and kill all apps after the intro videos are run.
I wonder if it’s possible to make a small app that just leaks all memory to kill all backgrounded apps?

On 9 Nov 2013, at 10:58, Andras Kovi <email@hidden> wrote:

The restoration happens as soon as the OS cannot serve the request. Reading a dynamic characteristic is such an event. Can you add the peripheral logs too? Does it crash or does anything extraordinary happen?

Btw, which game do you use? Just curious.

Andras

On 2013.11.09., at 11:52, Darren Jones <email@hidden> wrote:

Yes it is restored, as before I added the restore ID nothing was detected after killing the app (Running a memory intensive game) whereas now I can detect the peripheral and it's services/characteristics.

Sent from my iPhone

On 9 Nov 2013, at 10:50, Andras Kovi <email@hidden> wrote:

Does the restoration on the peripheral side happen?
On 2013.11.09., at 9:17, Darren Jones <email@hidden> wrote:

I connect to the peripheral, read a characteristic, then disconnect.
I’m finding that sometimes when the peripheral has been backgrounded and the app killed from memory it can still be discovered fine (now I use the restoration ID) and has the correct service and characteristic UUID’s, however when I try to read the characteristic it gives the error “Unknown error”.

Is this a known issue or possibly something I am just doing wrong?

Here’s my log when it happens:
Nov  9 08:15:31 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: Scanning started
Nov  9 08:15:31 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: -[BTScanViewController scanningStarted]
Nov  9 08:15:31 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: -[BTServerSingleton centralManager:didDiscoverPeripheral:advertisementData:RSSI:]
Nov  9 08:15:31 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: Did discover peripheral. peripheral: <CBPeripheral: 0x1700ba7c0 identifier = 34B922CF-4911-697F-07B2-C448DB882D7D, Name = "iPad", state = disconnected> rssi: -38, Name: iPad advertisementData: {
   kCBAdvDataChannel = 38;
   kCBAdvDataHashedServiceUUIDs =     (
       "Unknown (<92593d70 d32c4d5a 88600fb5 04e657b4>)"
   );
   kCBAdvDataIsConnectable = 1;
}
Nov  9 08:15:31 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: Connecting to peripheral <CBPeripheral: 0x1700ba7c0 identifier = 34B922CF-4911-697F-07B2-C448DB882D7D, Name = "iPad", state = disconnected>
Nov  9 08:15:31 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: Peripheral Connected successfully: <CBPeripheral: 0x1700ba7c0 identifier = 34B922CF-4911-697F-07B2-C448DB882D7D, Name = "iPad", state = connected> with UUID: <__NSConcreteUUID 0x178221940> 34B922CF-4911-697F-07B2-C448DB882D7D
Nov  9 08:15:32 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: -[BTServerSingleton peripheral:didDiscoverServices:]
Nov  9 08:15:32 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: Services count:1
Nov  9 08:15:32 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: Found Unknown (<92593d70 d32c4d5a 88600fb5 04e657b4>)
Nov  9 08:15:32 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: -[BTServerSingleton peripheral:didDiscoverCharacteristicsForService:error:]
Nov  9 08:15:32 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: Characteristics found:Unknown (<4e7a08a9 558f4b03 a404818e 0d19eb05>)
Nov  9 08:15:32 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: Found name characteristic, going to read it
Nov  9 08:15:42 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: (null)
Nov  9 08:15:42 Darrens-iPhone-5s Bluetooth-Test[141] <Warning>: Error discovering characteristics: Unknown error.


On 8 Nov 2013, at 13:03, András Kövi <email@hidden> wrote:

No, it does not persist. Additionally, the peripheral side is a little buggy. Make sure you disconnect all centrals before the peripheral is terminated otherwise the restoration process will/ is highly probable to crash. You need to implement your own solution for this at this moment.


2013/11/8 Darren Jones <email@hidden>
Nevermind. I’m just watching the CB WWDC session and it explains how to persist in the background.

What I haven’t heard mentioned, is if this can persist through a reboot like CoreLocation can?

On 8 Nov 2013, at 09:50, Darren Jones <email@hidden> wrote:

Thanks for the responses. I’ve decided to try and make my app idea work with background peripheral and foreground scan, which I believe should work just fine, however i’m having mixed results.

I can have a peripheral broadcasting fine in the background and after 2 days of not using the device, I can still detect and connect to it :)
On my iPad mini, I detect it broadcasting in the background, but when I load up a memory intensive game (and I assume kills my app) then the peripheral is no longer detectable until my app is relaunched.

Is CoreBluetooth not meant to keep my peripheral broadcasting all the time?

Thanks

On 6 Nov 2013, at 22:21, Chris Miles <email@hidden> wrote:

You could submit a TSI requesting the clarification you need. Be specific though. This is the quickest way to get access to the engineers. Otherwise, wait for WWDC labs :)

https://developer.apple.com/support/technical/submit/

Cheers,
Chris

On 6 Nov 2013, at 2:49 am, András Kövi <email@hidden> wrote:

But does best effort mean: include nothing at all times? Usually I have a single service advertised. Even that doesn't fit in? I feel like the implementation should adhere at least to what the documentation says it does. If it doesn't do anything, then why bother even mentioning it. :) 

This doesn't seem to be reasonable so some clarification from engineers who look at the CoreBluetooth code every day would be highly appreciated.

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  • Follow-Ups:
    • Re: iPhones detecting each other in background
      • From: Andras Kovi <email@hidden>
References: 
 >iPhones detecting each other in background (From: Darren Jones <email@hidden>)
 >Re: iPhones detecting each other in background (From: András Kövi <email@hidden>)
 >Re: iPhones detecting each other in background (From: Etan Kissling <email@hidden>)
 >Re: iPhones detecting each other in background (From: András Kövi <email@hidden>)
 >Re: iPhones detecting each other in background (From: Darren Jones <email@hidden>)
 >Re: iPhones detecting each other in background (From: Darren Jones <email@hidden>)
 >Re: iPhones detecting each other in background (From: András Kövi <email@hidden>)
 >Re: iPhones detecting each other in background (From: Darren Jones <email@hidden>)
 >Re: iPhones detecting each other in background (From: Andras Kovi <email@hidden>)
 >Re: iPhones detecting each other in background (From: Darren Jones <email@hidden>)
 >Re: iPhones detecting each other in background (From: Andras Kovi <email@hidden>)

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