[linux-nfc] Re: [PATCH v2] tag: Implement readout of tag UID via DBus interface

[Mark Greer <mgreer@animalcreek.com>]

On Tue, Aug 10, 2021 at 11:58:31AM +0200, Frieder Schrempf wrote:
> On 08.08.21 03:55, Mark Greer wrote:
> > On Thu, Mar 18, 2021 at 05:14:35PM +0100, Frieder Schrempf wrote:
> >> Hi Fabian,
> >>
> >> On 16.03.21 19:49, Gottstein, Fabian wrote:
> >>> Hi Frieder,
> >>>
> >>> thanks for the patch.
> >>
> >> thanks for your feedback.
> >>
> >>>
> >>> Could you please also consider the following situation:
> >>> In the case of a NFC Tag Type 1, the identifier is delivered via the RID command (see NFC Digital Protocol). Thus, the Tag's nfcid property is updated in a later step.
> >>> To inform the neard users, a property changed signal has to be emitted when nfcid has changed (in near_tag_set_nfcid). Also, a exists() handler for the new DBus property should be implemented.
> >>
> >> I'm new to NFC and D-Bus, so I don't know much about what use-cases and
> >> requirements there are.
> >>
> >> Your request sounds reasonable and I think I have a rough understanding of
> >> what is probably needed to implement this. Still to actually do this I need
> >> to look at the specifications and the code more closely and I don't know
> >> if/when I will find time to do this.
> >>
> >> Also I don't have any hardware to test this with NFC type 1 tags.
> >>
> >>>
> >>> Another thing regarding building the response message:
> >>> The following code snippet could simplify and improve the readability of the usage of the dbus message builder:
> >>>
> >>> dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE_AS_STRING, &entry);
> >>> dbus_message_iter_append_fixed_array(&entry, DBUS_TYPE_BYTE, &uid, len);
> >>> dbus_message_iter_close_container(iter, &entry);
> >>>
> >> Thanks for the improved code, I will use this instead.
> >>
> >> Frieder
> > 
> > Hi Frieder.
> > 
> > Do you have an updated version of this patch (or did I miss it)?
> 
> No, unfortunately not. I implemented this fix for a project that is now discontinued. I can try to find some time in my spare time to implement at least Fabian's code improvement suggestion. But I don't know if it makes sense to upstream this without the changes Fabian suggested in regard to NFC Tag Type 1 and I currently have neither time to dig into this, nor hardware to test it.

Okay, no problem.

Mark
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