site_archiver@lists.apple.com Delivered-To: bluetooth-dev@lists.apple.com Dkim-signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=bluekitchen-gmbh.com; s=default; h=Date:To:References:Message-Id:Subject: Mime-Version:Content-Type:From:Sender:Reply-To:Cc:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=VsPJEANkLMY4u9ys8vIwDwNFtViND7wQse/5myzKc+c=; b=prdUquGMC23Umx3l8vaHwAhdJP Lc7BLZ+ktP+7RjoIDQE+iMoCKLvZ/U4p6hrzCPc2OnaazjDWLi0ZfA6SDNfxXRjCAbvIxFd9mpG8o 1ssKdjYiJOtb/yjD4UCP6g236EJ7XHtPMq3+gnRQVe31v0nCopYoLVWaEHyEpyMZcGhn7DqrExvku LxdwXbbHh/rGQOekMDjKIEW951QDbVhJvB0GW7VRQITit5xH7EDQSx7lcoklWWEKhnG4+I9Xt2XOb ipwxchr/gXCaaG8jrocEZaiJ/LG/bNrL2XdA2XO2H0kQvz90uwl+MK9/elp92urntiH1TPcgly4nm UDyRBd+w==; Hi Chip In Bluetooth Classic (BR/EDR), the HID Host has to announce an HID Service via SDP and accept L2CAP connections if it wants to accept incoming connections, e.g. a connection initiated by the keyboard (which is implemented most Bluetooth keyboards). Cheers Matthias — Dr. sc. Matthias Ringwald Co-founder BlueKitchen GmbH, Zurich https://bluekitchen-gmbh.com <https://bluekitchen-gmbh.com/>

On 4 Oct 2017, at 19:39, Chip Wachob <cw@allenorgan.com <mailto:cw@allenorgan.com>> wrote:

Matthias,

Thank you for the information and the link.

Does this also apply to non-LE applications?

Chip Wachob Design Engineer Allen Organ 150 Locust St. Macungie, PA 18062 V 610.966.2200 F 610.966.4684

Walking on water and writing software to specification is easy if they're frozen.

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On 10/2/2017 7:54 AM, Matthias Ringwald wrote:

...

Hi Chip

The client of an LE HID Device (HID-over-GATT), the HID Host, does not need to implement or advertise any services. The HID Device can reconnect and send new notifications if needed.

Feel free to browse the specification: https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=245141 <https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=245141>

Cheers Matthias

— Dr. sc. Matthias Ringwald Co-founder BlueKitchen GmbH, Zurich https://bluekitchen-gmbh.com <https://bluekitchen-gmbh.com/>

...

On 29 Sep 2017, at 14:42, Chip Wachob <cw@allenorgan.com <mailto:cw@allenorgan.com>> wrote:

Hello again,

I realize that this is an Apple specific list, but everyone here seems friendly enough that I think I can ask this more general question without being flamed...

Can someone please confirm or correct my understanding about making a connection with BT?

As I understand it, for two devices to be able to connect they must both have the same Service UUID (and Service Class UUID).

Say, for example, a BT keyboard. Keyboards are usually handled under the HID group, so the keyboard must advertise that it supports HID and a keyboard. Likewise, on the other side of the connection, the other device needs to also have a identical UUID so that the two devices know that they can 'talk' on the same "port".

Did I read this right?

I presume there's no way around this requirement if the device that you want to connect the keyboard to does not advertise that capability...

Thank you, -- Chip Wachob

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