[Sis-dtn] CCSDS BP - Application Data Unit

[Vint Cerf]

Felix, that strikes me as a very good point. Will be interested in Keith's
reaction.
v


On Mon, Oct 30, 2023 at 1:02 PM Felix Flentge via SIS-DTN <
sis-dtn at mailman.ccsds.org> wrote:

> Hi,
>
>
>
> When trying to describe the use of CFDP over BP, I have stumbled across a
> peculiarity of the BP service interface: the Application Data Unit
> Parameter is defined as
>
>
>
> 4.3.9 APPLICATION DATA UNIT PARAMETER
>
> The application data unit parameter shall indicate *the location (in
> memory or non-volatile storage, a local implementation matter)* of the
> application data conveyed by the bundle.
>
>
>
> For me this seems to be to implementation-specific for an abstract service
> interface and would prefer if we could say that the application data unit
> parameter simply **is** the application data unit as defined in 1.4.3.2:
>
> application data unit, ADU: The application-specific data being
> transferred via the Bundle Protocol.
>
>
>
> Of course, for a lot of implementations it will be practical to pass a
> pointer to the application data and not a copy. So, we could add a note
> that the way application data is actually passed is implementation
> specific. No other CCSDS service interface seems to work with ‘locations’
> of data.
>
>
>
> If we want to keep the application data unit parameter as location, I
> think we should at least update the Send.Request and the
> BundleDelivery.Indication to include ‘application data unit parameter’
> instead of ‘application data unit’.
>
>
>
> Regards,
>
> Felix
>
>
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