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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 08:17:00 +0000
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>)

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