January 2013 - Bluetooth-dev

Use 2 central Manager
by Alpwise iOS Dev 25 Jan '13

25 Jan '13

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Re: Bluetooth LE problems with new iOS devices?
by Long LI 25 Jan '13

25 Jan '13

I have same problem, Has anyone gotten a solution now? >> 1. Make a connection to the peripheral which succeeds. Attempt to >> discover services. Instead of receiving the didDiscoverServices callback, I >> get the didDisconnectPeripheral callback with ErrorCode=6, “The connection >> has time out unexpectedly”. It seems to be completely random when this >> happens. I’ve also seen cases where I am getting this disconnect at a later >> time (after subscribing to characteristics). Best regards, Long LI http://www.bbshare.com Google Toolbar for Safari Google Multi-Account Launcher for Chrome QR Pro for iPhone http://www.zesty.co.jp Control your Nikon DSLR with your iPhone On Wed, Nov 7, 2012 at 6:04 AM, Etan Kissling <kissling(a)oberon.ch> wrote: > One thing that would also help is the new interval that you are trying to > switch to. iOS accepts intervals down to 18.75 ms. However, in the iOS > Guidelines for Bluetooth accessories, it is noted that it is not recommended > to go below 38.75 ms. > > Etan > > > On 06.11.2012, at 19:07, "Borna Vojdani" <bornav(a)gmail.com> wrote: > > Thanks for the reply Mike, > > I as well have been using iOS5 and iOS6 devices, and have only noticed this > specific error on iOS6.0 and iOS6.1 beta. It may be worth looking into the > over the air data via a capture device if one is available to you in order > to learn more. But based on my experience, and "unexpected timeout" is a > fatal connection time radio dropout in which no termination packet is > broadcasted by the peripheral. > > I say so as I have also have experienced the error you mentioned: “The > connection has time out unexpectedly”. I experience this error on a daily > basis with moderate to heavy usage of the peripheral which includes > connecting and disconnecting throughout the day. It seems to randomly > surface and I have not discovered the root cause, at least in my case. > > However, after looking through the over the air data, I can concluded that, > for my case: > > -During certain connection events, when the connection update request is > replied to by the iPhone with a success message (result 0x000), something > goes wrong in the timing/scheduling of the new rate as done by iOS/iDevice, > and the peripheral drops the connection sans a termination packet > immediately due to the confusion. This is why iOS seems to come back with > "an unexpected timeout" error. The stack does not seem to be aware of any > issues introduced, nor does is see a termination packet as one is not > broadcasted by the peripheral due to fatal connection parameter settings. > > -At times, this happens repeatedly until some measures are taken to reset > the state of the device/BT; meaning that the connection fails multiple times > until some intervention is done. > > -It seems to be completely random. I have not been able to find a reliable > method of reproduction. > > I'm not sure if this is the same issue you are having, as you stated a > disconnection occurring upon service discovery. I would however note that > the default interval set by iOS is very short, and if there are not many > services to be discovered and configured, this can happen rather quickly. > > If this is happening often enough to you that is becoming a big issue, I > would suggest temporarily disabling the update request as a method of > diagnosis. > > Best Regards, > > Borna. > > On Tue, Nov 6, 2012 at 3:39 AM, Michael Mallinson > <Michael.Mallinson(a)entrust.com> wrote: >> >> Hi Borna, >> >> >> >> We do update the connection speed from the peripheral side but we are >> doing this after the iPhone subscribes to a characteristic. So this >> shouldn’t occur until after service and characteristic discovery has >> completed. >> >> >> >> Cheers, >> >> --Mike >> >> >> >> From: Borna Vojdani [mailto:bornav@gmail.com] >> Sent: Monday, November 05, 2012 4:57 PM >> To: Michael Mallinson >> Cc: bluetooth-dev(a)lists.apple.com >> Subject: Re: Bluetooth LE problems with new iOS devices? >> >> >> >> Hi Michael, >> >> >> >> With respect to issue #1, is you're peripheral expecting, or initiating a >> "connection update parameter request" during the initial >> connection/discovery period? >> >> >> >> Best Regards, >> >> >> >> Borna Vojdani >> >> On Mon, Nov 5, 2012 at 5:09 AM, Michael Mallinson >> <Michael.Mallinson(a)entrust.com> wrote: >> >> Hi, >> >> >> >> I’m curious if anyone has seen any issues with the iPhone 5 and 5th gen >> iPod Touch when used with Bluetooth LE. >> >> >> >> I’m seeing several problems with some of these devices that I wasn’t >> seeing with the original Bluetooth LE capable devices (iPhone 4s/iPad 3). >> My application is using bluetooth-central mode and connecting to a Bluegiga >> BLED112 USB dongle. Currently using iOS 6.0.1 on all my test devices. >> >> >> >> 1. Make a connection to the peripheral which succeeds. Attempt to >> discover services. Instead of receiving the didDiscoverServices callback, I >> get the didDisconnectPeripheral callback with ErrorCode=6, “The connection >> has time out unexpectedly”. It seems to be completely random when this >> happens. I’ve also seen cases where I am getting this disconnect at a later >> time (after subscribing to characteristics). >> >> 2. Failures while trying to subscribe to characteristics which >> result in ErrorCode=0, “Unknown Error”. >> >> 3. Failures in the didDiscoverServices callback ErrorCode=0, >> “Unknown Error”. >> >> >> >> The problems seem to be sporadic and don’t always occur. Interestingly, >> I’ve also got one iPod Touch that hasn’t shown any signs of these problems >> yet. I’ve been unable to reproduce these issues with the iPhone 4S/iPad 3 >> and have only seen them with the iPhone 5 and new iPod Touch. Other than >> the iOS device, the rest of the picture is the same. >> >> · Bluegiga BLED112 USB Dongle >> >> · Same version of the USB Dongle firmware, Windows driver and >> Windows application. >> >> · iOS 6.0.1 >> >> · Same version of the iOS application. >> >> >> >> It is my understanding that the new iOS devices are using a new >> WiFi/Bluetooth chip in them. I wonder if this could be contributing to the >> problems I’m seeing? >> >> >> >> Michael Mallinson >> >> Software Developer >> >> Phone: (613) 270-2548 >> >> >> >> Entrust >> >> Securing Digital Identities >> >> & Information >> >> http://www.entrust.com >> >> >> >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/bluetooth-dev/bornav%40gmail.com >> >> This email sent to bornav(a)gmail.com >> >> > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/bluetooth-dev/kissling%40oberon.ch > > This email sent to kissling(a)oberon.ch > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/bluetooth-dev/lilong%40gmail.com > > This email sent to lilong(a)gmail.com > _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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A2DP with AAC codec: non-existent document reference in the "Bluetooth Accessory Design Guidelines for Apple Products"
by Shawn Steenhagen 24 Jan '13

24 Jan '13

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Need N41 for debugging
by Aarti Kumar 23 Jan '13

23 Jan '13

Does anyone have an extra N41 that I can borrow for a day ? Thanks. Aarti. _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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<CBConcreteCentralManager: 0x885be70> is not powered on
by Steve Childerley 22 Jan '13

22 Jan '13

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RE: CoreBluetooth[WARNING] <CBConcreteCentralManager: 0x885be70> is not powered on
by Steve Childerley 22 Jan '13

22 Jan '13

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Re: Quality questions about A2DP & AVRCP
by Aarti Kumar 21 Jan '13

21 Jan '13

Absolute volume feature, part of AVRCP 1.4 specification provides capability to control volume at the A2DP sink side. Refer section 6.13 in AVRCP 1.4 specification. All iOS devices supports this feature. When an A2DP sink device connects - that supports "Absolute Volume" feature, iOS device will disable local gain level change (with the volume of the source audio set to 100%) . Change in volume level will be notified in percentage to the sink device, which can then modulate the gain level. Thanks. Aarti. On Jan 18, 2013, at 8:03 AM, Gordon Rankin wrote: > Gang, > > I am looking to get information on the best quality of audio output I can get from Bluetooth. I know the codec has a lot to do with it, but I am looking even further than that. > > So I am designing a A2DP sink with an AVRCP source. > > ~~~ > > Volume control? In general all digital volume controls will reduce the resolution of each sample so I am wondering... do I signal the A2DP source with AVRCP to make the volume = 100% will that result in the best data available at my A2DP sink? Digital volume controls in the source will basically multiply the float32 sample with the digital volume percent to create the new sample. But since we get fixed point samples at the endpoint this basically means we loose resolution if the volume control is set to something other than 100%. > > I can control the actual volume in the analog domain which will result in the best support of the digital samples. > > Or is there some other way of handling this? > > Thanks, > Gordon > > -- > J. Gordon Rankin > Owner and Chief Scientist > ====== Wavelength Audio, ltd ====== > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/bluetooth-dev/aarti%40apple.com > > This email sent to aarti(a)apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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Simulator does not recognize Targus BLE (4.0) USB Adapter
by Bilal Ahmed 20 Jan '13

20 Jan '13

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Re: CoreBluetooth[WARNING] <CBConcreteCentralManager: 0x885be70> is not powered on
by robert carlsen 20 Jan '13

20 Jan '13

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CoreBluetooth[WARNING] <CBConcreteCentralManager: 0x885be70> is not powered on
by Steve Childerley 20 Jan '13

20 Jan '13

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