Apple

On Mon, Nov 9, 2015 at 11:21 AM, Jan Lübeck (Fyrastudio) <email@hidden> wrote:

Zachary,

Your example mentions foreground-only apps, which is not my case. But thanks!

______
Jan Lübeck
Chief Technology Officer
fyrastudio.com

On Mon, Nov 9, 2015 at 2:18 PM, Zachary Kaplan <email@hidden> wrote:
Jan,

I think this is the default behavior. Have you read this?

https://developer.apple.com/library/ios/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/CoreBluetoothBackgroundProcessingForIOSApps/PerformingTasksWhileYourAppIsInTheBackground.html

For example it says:

On the central side, foreground-only apps—apps that have not declared to support either of the Core Bluetooth background execution modes—cannot scan for and discover advertising peripherals while in the background or while suspended. On the peripheral side, advertising is disabled, and any central trying to access a dynamic characteristic value of one of the app’s published services receives an error.
Depending on the use case, this default behavior can affect your app in several ways. As an example, imagine that you are interacting with the data on a peripheral that you’re currently connected to. Now imagine that your app moves to the suspended state (because, for example, the user switches to another app). If the connection to the peripheral is lost while your app is suspended, you won’t be aware that any disconnection occurred until your app resumes to the foreground.

On Mon, Nov 9, 2015 at 11:00 AM, Jan Lübeck (Fyrastudio) <email@hidden> wrote:
Hey all, first message here, so I hope I don't sound too newbie.

I've been looking at the documentation to have my app discover peripherals while on the background and I think I have it all set up correctly.

1) I wait until the CBCentralManager's state is CBCentralManagerStatePoweredOn before I start scanning.
2) On scanForPeripheralsWithServices I pass an array of UUIDs with the services. NOT scanning with nil as that doesn't work in the background.
3) I have bluetooth-central inside UIBackgroundModes in my plist

With all these, eveything works great in the foreground, plus it works great if I discover the peripheral in the foreground and then go to the background. But if I go to the background before discovering the peripheral, it is never discovered.

UNLESS

I go to my phone Settings and open the BlueTooth page. Without even touching anything else, centralManager:didDiscoverPeripheral is called on my app as expected.

This surprised me, but at least gave me something solid to come and ask here.

Is there something I'm missing?

I'm running iOS 9.1. Couldn't test on 8.x yet to see if it is a new thing.

Thanks!

______
Jan Lübeck
Chief Technology Officer
fyrastudio.com

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