2023-05-17 00:09:32

by Jake Rue

Subject: Where does the DeviceID Version value in EIR for Linux hosts come from?

When I look at btmon output of advertising reports for BT Classic for
Linux boxes, I see something like this:

> HCI Event: Extended Inquiry Result
[cut]
Device ID: USB Implementer's Forum assigned (0x0002)
Vendor: Linux Foundation (0x1d6b)
Product: 0x0246
Version: 5.4.0 (0x0540)

I am wondering where the 0x540 version comes from / corresponds to
about the host software stack version (I couldn't find such a constant
in the BlueZ source code or googling around. But for instance a BlueZ
5.64 had this value, so it doesn't match 1:1 to BlueZ). But it seems
to change slightly over time for different Linux machines.

And I'm also curious about the 0x246 product ID, though it seems like
that's always the same for all Linux machines I've seen thus far.

Cheers - Jake

2023-06-15 14:45:57

by Jake Rue

Subject: Re: Where does the DeviceID Version value in EIR for Linux hosts come from?

On Tue, May 16, 2023 at 5:07 PM Jake Rue <[email protected]> wrote:
>
> When I look at btmon output of advertising reports for BT Classic for
> Linux boxes, I see something like this:
>
> > HCI Event: Extended Inquiry Result
> [cut]
> Device ID: USB Implementer's Forum assigned (0x0002)
> Vendor: Linux Foundation (0x1d6b)
> Product: 0x0246
> Version: 5.4.0 (0x0540)
>
> I am wondering where the 0x540 version comes from / corresponds to
> about the host software stack version (I couldn't find such a constant
> in the BlueZ source code or googling around. But for instance a BlueZ
> 5.64 had this value, so it doesn't match 1:1 to BlueZ). But it seems
> to change slightly over time for different Linux machines.
>
> And I'm also curious about the 0x246 product ID, though it seems like
> that's always the same for all Linux machines I've seen thus far.
>
> Cheers - Jake

It's not the most important thing in the world, but I'm still curious
if anyone knows where this number comes from.

Cheers - Jake