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Re: iOS Bluetooth in Background
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Re: iOS Bluetooth in Background

  • Subject: Re: iOS Bluetooth in Background
  • From: Steve Jabs <email@hidden>
  • Date: Tue, 17 Dec 2013 01:16:31 -0500
Hi Thomas,

I cannot see why this would not be possible. Have you looked into the new iOS 7 state preservation and restoration?

https://developer.apple.com/library/ios/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/CoreBluetoothBackgroundProcessingForIOSApps/PerformingTasksWhileYourAppIsInTheBackground.html
(It's about half-way in)

Should have no issues setting up the scan via this method and the other app should also wake up when it's connected by that Central. If you need additional time to determine whether they are in range long enough, you'll need to set up a background task.

Here is my question for you though? Wouldn't you double down on connections? How do you control which person is the Central and which is the Peripheral?

Give that a try and let us know how you make out!

Sincerely,

Steve Jablonski
p.  (814) 720-9067
e. email@hidden


On Tue, Dec 17, 2013 at 12:31 AM, Thomas Wong <email@hidden> wrote:

All,

 

This is the first time I post a question to a mailing list.  So, please forgive me if I do something wrong.  And my question is related to an iOS app, using Bluetooth API, in the background.

 

I think the answer to my question will be “it is technically impossible within current iOS functionality”, but I want to give it one more shot before I officially give up.

 

The app I am creating runs almost entirely in the background, both as a Central (for scanning) and as a Peripheral (for advertising).  The idea is that, if I set up my profile in the app, and someone else set up his profile in the same app, the app will exchange business cards in the background when we meet, without the hassle of actually exchange the business cards physically.  The only trick is that, I don’t want to exchange business cards with everyone passing by.  I only want to exchange business cards with people that are within my Bluetooth range for X minutes (and a bunch other criteria that is unrelated to the technical aspect of my question).

 

The apps works great in the foreground, and background advertising always works 100%.  It is background scanning that is proving to be my downfall.

 

I have done quite a bit research on the limitation of Bluetooth-dependent app while running in the background, and I know that peripherals in the background advertise their ServiceUUIDsKey in an overflow area, while central in the background can only scan for targeted ServiceUUIDKey, and can’t see the overflow area.

 

So, it is pretty much an impossible task to have the app scan in the background for another app that is advertising in the background?  Does anyone know if Apple is working on making this possible?

 

Thanks,

 

Tom


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References: 
 >iOS Bluetooth in Background (From: Thomas Wong <email@hidden>)

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