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

Re: CBPeripheral UUID is unique?
by Andras Kovi 12 Mar '13

12 Mar '13

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CBPeripheral UUID is unique?
by Flavio Crisciani 12 Mar '13

12 Mar '13

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Re: Question about including services
by András Kövi 12 Mar '13

12 Mar '13

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Re: Question about including services
by Etan Kissling 12 Mar '13

12 Mar '13

Rick, on the iOS stack, you can only discover services within a service. Because an included service is considered as a separate service in BLE, you will have to discover the included service first, then read the characteristics you want within it. Consider specifying UUID filters to reduce latency. Also, on your peripheral, make sure to group your 16-bit UUIDs at the beginning and your 128-bit UUIDs of the handle range. This speeds up discovery as multiple 16-bit UUIDs can be combined and returned in a single packet. Device Name characteristic is discovered and read automatically by iOS. If you try to mess with it manually, you will run into errors. Just use the peripheral.name property and the relevant delegate callback in order to retrieve name updates. Etan On 12.03.2013, at 08:28, Rick Mann <rmann(a)latencyzero.com> wrote: > > On Mar 12, 2013, at 00:06 , Andras Kovi <allprog(a)gmail.com> wrote: > >> My first question is why would you want to replicate the Device Name characteristic? This is handled by iOS for you, you can set it at the > > That's true, you do. And in fact, I use that. But I'm asking more generally. If I include one service in another, can I do a single enumeration of the characteristics in that top-level service? > >> start of advertisement. Additionally, you'll get this error for service 0x1800: >> >> Service add failed: Error Domain=CBErrorDomain Code=8 "The specified UUID is not allowed for this operation." UserInfo=0x1d5b3b80 {NSLocalizedDescription=The specified UUID is not allowed for this operation.} > > Hmm. I do a discoverServices with CBUUIDGenericAccessProfileString as one of the UUIDs. I don't get that error. > >> You should either use the built in Device Name or your should create your own app specific definition for it. (Though that value will not be published in the advertisement packets.) >> >> Unfortunately, there is no shortcut to access the characteristics. You must do the discovery first. > > Okay, thanks! Can you tell me if those objects survive a disconnect-reconnect? Can I re-use them? I've already verified they don't work if I'm not connected, so my suspicion is that I'll have to re-discover them. > > If that's the case, it seems the only safe way to re-read a characteristic is to completely re-discover it, at least, if you find that the peripheral disconnected since the last time you did discovery. > > > -- > 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: Can I keep CBService and CBCharacteristics around?
by Etan Kissling 12 Mar '13

12 Mar '13

Rick, services and characteristics have to be re-discovered after every connect if the link is not encrypted. If encryption is active, you may find cached services / characteristics in the peripheral's services and their characteristics. Not sure about it, as I did not test that. The peripheral object itself can only be reused if you still have the same CBCentralManager instance. If you create a new one, you can pass the UUID to retrievePeripherals in order to get a new CBPeripheral instance. Note that this does only work for devices that were previously connected and, therefore, have a UUID. Etan On 12.03.2013, at 07:49, Rick Mann <rmann(a)latencyzero.com> wrote: > If I've scanned for my peripherals, connected, enumerated the services and characteristics, can I keep those objects around for later reads? What happens if the peripheral disconnects and reconnects? > > -- > 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: Question about including services
by Rick Mann 12 Mar '13

12 Mar '13

On Mar 12, 2013, at 00:06 , Andras Kovi <allprog(a)gmail.com> wrote: > My first question is why would you want to replicate the Device Name characteristic? This is handled by iOS for you, you can set it at the That's true, you do. And in fact, I use that. But I'm asking more generally. If I include one service in another, can I do a single enumeration of the characteristics in that top-level service? > start of advertisement. Additionally, you'll get this error for service 0x1800: > > Service add failed: Error Domain=CBErrorDomain Code=8 "The specified UUID is not allowed for this operation." UserInfo=0x1d5b3b80 {NSLocalizedDescription=The specified UUID is not allowed for this operation.} Hmm. I do a discoverServices with CBUUIDGenericAccessProfileString as one of the UUIDs. I don't get that error. > You should either use the built in Device Name or your should create your own app specific definition for it. (Though that value will not be published in the advertisement packets.) > > Unfortunately, there is no shortcut to access the characteristics. You must do the discovery first. Okay, thanks! Can you tell me if those objects survive a disconnect-reconnect? Can I re-use them? I've already verified they don't work if I'm not connected, so my suspicion is that I'll have to re-discover them. If that's the case, it seems the only safe way to re-read a characteristic is to completely re-discover it, at least, if you find that the peripheral disconnected since the last time you did discovery. -- 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: Question about including services
by Andras Kovi 12 Mar '13

12 Mar '13

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Can I keep CBService and CBCharacteristics around?
by Rick Mann 12 Mar '13

12 Mar '13

If I've scanned for my peripherals, connected, enumerated the services and characteristics, can I keep those objects around for later reads? What happens if the peripheral disconnects and reconnects? -- 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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Question about including services
by Rick Mann 12 Mar '13

12 Mar '13

Hi. I'm developing a few custom services and characteristics in my BTLE peripheral. I'm also using the standard ones, like for the device name. If I include the standard GAP service in my custom service, does that mean that on the iOS side I can lookup just my custom service, and use that to get at the Device Name (0x2a00) characteristic? Or will I still have to look up the included service first? Perhaps I should also ask: Is there any shortcut to getting the value of a characteristic given its UUID and a connection to a peripheral? Thanks, -- 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: GAP - Device Name Characteristic (UUID:0x2A00) can't be write ?
by Etan Kissling 11 Mar '13

11 Mar '13

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