Could you elaborate why exactly you need to receive multiple callbacks from the same device? I guess that you could also connect to it once you find it, and then issue another connect request when it disconnects, if you want to detect proximity to the device. Connect requests are performed in background and also when the peripheral is not in range they just sit there waiting for proximity. This way you don't have to scan for the device in order to detect if it is there. Hoping that this may help you. Etan On 07.11.2012, at 22:17, "Nick Moen" <NickM@npe-inc.com> wrote:

Thanks Andras, I know for a fact that does work. When I receive the didDiscoverCallBack, I connect to the device, then disconnect, and then restart the BTLE scan. This all worked great prior to the update to Xcode 4.5.1 and iOS 6.

Nick

-----Original Message----- From: Andras Kovi [mailto:allprog@gmail.com] Sent: Monday, November 05, 2012 6:02 PM To: Rick Mann Cc: Nick Moen; bluetooth-dev Bluetooth Subject: Re: Resetting CentralManager to re-detect previously detected devices

Unfortunately that flag is ignored in background. This behavior has not changed in iOS6.

I haven't seen any "regular" way to implement what you would like. However, there is a theoretical solution. I have not tried it yet but I suppose it should work. When you receive the didDiscoverCallback, the app gets about 10 seconds to run. During this, you may restart the scanning by stopping it first and then starting again.

The question is whether restarting the scan clears out the cache while the app is backgrounded.

Cheers, Andras

On 2012.11.06., at 0:40, Rick Mann <rmann@latencyzero.com> wrote:

...

On Nov 5, 2012, at 14:40 , Nick Moen <NickM@npe-inc.com> wrote:

...

Has there been any update with iOS 6.0 that allows for the reset of

CentralManager so that that same device can be discovered multiple times in the background? I have a device that I would like to trigger multiple callbacks to didDiscoverPeripheral in the background. I know there was no way to do this in iOS5 but I wanted to see if there were any updates.

...

There's the CBCentralManagerScanOptionAllowDuplicatesKey you can pass

to -scanForPeripheralsWithServices:options:. Dunno what that does in the background, but if it's on in the foreground, you get advertising packets as long as you scan.

...

-- Rick

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