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    <p>Why do you need background execution even when the bluetooth hardware is disconnected? I don't think that you need to "rescan continuously" to reconnect again, if the hardware is "paired" with the iPhone/iPad, it will reconnect itself. Like a bluetooth headset. Or not?</p> <p>AFAIK you have no chances to accomplish what you are asking for. A normal App is always suspended when the user go back to home. The app has approx. 5 secs of background time to stop timers, save state ecc ecc. There are special background modes that allows you to have more background time, and each of this mode (explained in the page you linked) has a different behavior.</p> <p>About the bluetooth mode: The descripted behavior is not an issue, but it's by design: </p> <ul> <li><p>the app is suspended</p></li> <li><p>when the app is suspended, it can be killed by the OS to free ram (and there are no tricks to avoid this), but the system will wake up if needed.</p></li> <li><p>the app is then awaken every time a notification is received (awaken from suspended state or lauched from "previously-killed" state)</p></li> <li><p>the app has 10 seconds to do tasks (save informations, ecc ecc). Moreover, can request +10 mins. of background time for a particular task</p></li> <li><p>after the 10 secs (or 10 min) the app is suspended again</p></li> </ul> <p>The example you wrote about the chat app is incorrect: chat apps usually doesn't use any background mode, simply they forward you messages using push notifications. When you open the app, the app connect to a server that stores all your messages and download it.</p> <p>You can get "more uptime" using location background mode (routing app can work in background), or using a combination of significative location changes (the app is awaken) and the 10 minutes background time, but I think that Apple will reject an app that "abuse" this.</p> <p>Shortly, you have to design your app to support this behavior.</p>
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    1. POReducing memory size to ensure backgrounding in iOS
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    1. COBLE acts differently than a paired BT2.1 device. You need to scan for advertising packets and then issue a connection. I would need to do this if I were disconnected from a device for a significant amount of time and then entered it's proximity range. At this point, a scan would have found the device's advertising packets, and it would reconnect. If the app itself has been killed, then background scanning won't be happening, and it would only reconnect if you open the app.
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      1. USJonathan
    2. CO@shred444: “BLE acts differently than a paired BT2.1 device. You need to scan for advertising packets and then issue a connection.” From what I know about iOS, the idea that a backgrounded app can be killed at any time is pretty fundamental. I’d expect Apple to solve this problem by making iOS itself scan for advertising packets, then inform apps when it finds them. (Judging from your question, I assume they haven’t implemented anything like this for Bluetooth Low Energy yet.)
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      1. USPaul D. Waite
    3. COI agree. On the Core Bluetooth Apple Dev Mailing List, one of the developers mentioned: "We're aware of this issue and are trying to come up with a solution. Currently, there is no workaround." So hopefully, they implement something similar to what you are describing. Until then, It looks like reducing strong references will help improve background duration (see my answer below)
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