[Sis-dtn] CCSDS BP - Application Data Unit

[Felix Flentge]

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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