April 2013 - Bluetooth-dev - lists.apple.com

Re: BLE scan under simulator finds service twice
by Rick Mann 19 Apr '13

19 Apr '13

On Apr 19, 2013, at 12:26 , Andras Kovi <allprog(a)gmail.com> wrote: > Rick, this is part of the normal operation. http://lists.apple.com/archives/bluetooth-dev/2013/Mar/msg00063.html > I guess you can use isEqualTo: to check if the peripheral is new or not. Fair enough. But the odd thing is, I wasn't getting these two when run on the device; only on the sim. -- Rick _______________________________________________ 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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Re: Any better solutions to BLE caching?
by Rick Mann 19 Apr '13

19 Apr '13

On Apr 19, 2013, at 02:36 , Etan Kissling <kissling(a)oberon.ch> wrote: > Excerpt from https://developer.apple.com/hardwaredrivers/BluetoothDesignGuidelines.pdf > The iOS device implements the GAP Service Changed characteristic, because the database contents can change at any time. The Bluetooth accessory should therefore support the Characteristic Value Indication of this characteristic and, upon receiving indications, invalidate its database cache accordingly. See the Bluetooth 4.0 specification, Volume 3, Part G, Section 7.1. Hmm. That excerpt seems to say that the *accessory* needs to respond to the indication by invalidating its own caches, rather than saying iOS will do the same thing. > Did not test this, but if it works, you should get a callback in the CBPeripheralDelegate (didInvalidateServices or something similar). So, there's no such delegate method, but I think the thing to do is get the value change indication for that specific characteristic. I'll try to implement that, and hopefully the caching won't prevent that characteristic from showing up. Actually, huh. I only change the service when I flash the BLE112, so I don't know how to properly send the update, without sending it every time the thing boots. -- Rick _______________________________________________ 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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Re: Parsing Advertisement data
by bpatil＠ovi.com 19 Apr '13

19 Apr '13

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Re: BLE scan under simulator finds service twice
by Etan Kissling 19 Apr '13

19 Apr '13

Rick, name discovery happens through active scanning, which means that an additional packet is sent to the peripheral in order to retrieve its name. Therefore, the name is not available immediately, and CoreBluetooth raises an additional didDiscover event in order to pass you the updated information, because it has no other callback method to notify you of the full information. I'm not sure why the delay is only 3ms in your case. Maybe the first request somehow gets delayed when it goes through all the layers of CoreBluetooth. Etan On 19.04.2013, at 21:03, Rick Mann <rmann(a)latencyzero.com> wrote: > I've been building my app and running it on an iPad for a while, and things behaved the way I expected. > > Just now I finally got around to trying an external BLE HCI and getting the simulator to see it. That worked well, and the app now runs in the simulator, but it discovers my BLE service twice. > > The first time, it has a null CBAdvertisementDataLocalNameKey value. The second time, it gets the value. In the scan, I have CBCentralManagerScanOptionAllowDuplicatesKey set to false: > > 2013-04-19 12:00:00.779 MatterScan[64624:c07] <FindCamerasViewController.m:250>: service: Unknown (<75d51f1b 4b2a431c 88af055e 4839b9be>) > 2013-04-19 12:00:00.780 MatterScan[64624:c07] <FindCamerasViewController.m:253>: Found service: (null) > 2013-04-19 12:00:00.782 MatterScan[64624:c07] <FindCamerasViewController.m:250>: service: Unknown (<75d51f1b 4b2a431c 88af055e 4839b9be>) > 2013-04-19 12:00:00.782 MatterScan[64624:c07] <FindCamerasViewController.m:253>: Found service: Souffle Girl > > Any ideas? > > -- > Rick > > > > > _______________________________________________ > 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/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

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Re: BLE scan under simulator finds service twice
by Andras Kovi 19 Apr '13

19 Apr '13

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BLE scan under simulator finds service twice
by Rick Mann 19 Apr '13

19 Apr '13

I've been building my app and running it on an iPad for a while, and things behaved the way I expected. Just now I finally got around to trying an external BLE HCI and getting the simulator to see it. That worked well, and the app now runs in the simulator, but it discovers my BLE service twice. The first time, it has a null CBAdvertisementDataLocalNameKey value. The second time, it gets the value. In the scan, I have CBCentralManagerScanOptionAllowDuplicatesKey set to false: 2013-04-19 12:00:00.779 MatterScan[64624:c07] <FindCamerasViewController.m:250>: service: Unknown (<75d51f1b 4b2a431c 88af055e 4839b9be>) 2013-04-19 12:00:00.780 MatterScan[64624:c07] <FindCamerasViewController.m:253>: Found service: (null) 2013-04-19 12:00:00.782 MatterScan[64624:c07] <FindCamerasViewController.m:250>: service: Unknown (<75d51f1b 4b2a431c 88af055e 4839b9be>) 2013-04-19 12:00:00.782 MatterScan[64624:c07] <FindCamerasViewController.m:253>: Found service: Souffle Girl Any ideas? -- Rick _______________________________________________ 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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RE: Parsing Advertisement data
by Joakim Fernstad 19 Apr '13

19 Apr '13

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Parsing Advertisement data
by bpatil＠ovi.com 19 Apr '13

19 Apr '13

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Re: Any better solutions to BLE caching?
by Etan Kissling 19 Apr '13

19 Apr '13

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Reading RSSI value when the app is on background
by George Chung (PFM-ENG-SZ) 19 Apr '13

19 Apr '13

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