Relation between 16- and 128-bit UUIDs

RE: Relation between 16- and 128-bit UUIDs

AndreasF — Tue, 12 Feb 2019 09:24:06 GMT

Hi Marco.

[quote user="marco.genise"]From my understanding this chapter is not meant as a general rule, as Bluetooth itself does not really know 16- or 32-bit UUIDs.[/quote]

This is correct.

You cannot know if the "namespace" is used by other standards.

Best regards,

Andreas

RE: Relation between 16- and 128-bit UUIDs

marco.genise — Mon, 11 Feb 2019 15:20:27 GMT

Hi Andreas,

my fault. Is this chapter within the Bluetooth Core Specification meant as a general rule or is this just an explicit rule targeting the Bluetooth assigned numbers within the Bluetooth base UUID?

From my understanding this chapter is not meant as a general rule, as Bluetooth itself does not really know 16- or 32-bit UUIDs. These are just a convention targeting the assigned numbers within the Bluetooth SIG "namespace" (Bluetooth base UUID).

What's your opinion on this?

Best regards,

Marco.

RE: Relation between 16- and 128-bit UUIDs

AndreasF — Mon, 11 Feb 2019 11:41:34 GMT

Hi Marco.

[quote user="marco.genise"]I don't understand this chapter as a general rule beside this.[/quote]

I'm a bit unsure if this is a question and you wish to have some explanation about this chapter.

Best regards,

Andreas

RE: Relation between 16- and 128-bit UUIDs

marco.genise — Fri, 08 Feb 2019 09:46:32 GMT

Hi Andreas,

I know this chapter within the Bluetooth Core Specification. Actually I read this as an explicit rule targeting the relation between 16- or 32-bit assigned numbers and the Bluetooth base UUID. I don't understand this chapter as a general rule beside this.

Best regards,

Marco.

RE: Relation between 16- and 128-bit UUIDs

AndreasF — Mon, 21 Jan 2019 08:01:20 GMT

Hi Marco.

[quote user=""]I understand this rule is used for 16-bit UUIDs within the Bluetooth SIG base UUID and thus the Nordic softdevice can handle custom services more efficiently when following this rule for these custom services, too.[/quote]

This is true.

[quote user="marco.genise"]could you please provide a source for your answer (e.g. Bluetooth Core Spec?)?[/quote]

Bluetooth Core Spec 4.2 chapter 2.5.1 - UUID

The SoftDevice follows the rules of this Chapter.

This is the arithmetic operation from the Bluetooth Core Spec used by the SoftDevice.

Best regards,

Andreas

RE: Relation between 16- and 128-bit UUIDs

marco.genise — Fri, 18 Jan 2019 07:29:08 GMT

Hi Andreas,

could you please provide a source for your answer (e.g. Bluetooth Core Spec?)?

Best regards,

Marco.

RE: Relation between 16- and 128-bit UUIDs

AndreasF — Fri, 11 Jan 2019 12:48:30 GMT

Hi.

[quote user=""]My question finally is: is this required by the Bluetooth specifications to always build resulting UUIDs by placing the 16-bit UUID to bytes 12 and 13? I know of the specification of this regarding the Bluetooth SIG base UUID, but not for custom UUIDs.[/quote]

If I understood the rest of your text correctly, then the answer is yes.

Best regards,

Andreas