[SIS-CFDPV1] CFDP WG (Virtual) Meeting

[Felix.Flentge at esa.int]

Hi Cheol,

sure, we should talk about the future direction and the timeline.

We should also discuss the 'trivial CFDP', in particular, CFDP over BP (or 
LTP directly).

IMHO, we should try to keep compatibility with current CFDP. However, we 
may want to make more features optional for use in such environments (and 
based on current implementation experience), eg:
- implementation of Class 2 / SFO / Proxy Operations
- filestore procedures
- fault handler overwrites
- suspension / resume

For Bundle Protocol/LTP, we should allow to embed any number of CFDP PDU 
in a single bundle / LTP Block (eg, a whole transaction). This may also 
facilitate CFDP processing on the receiving side a bit (inactivity timer / 
limit). 

Regards,
Felix



From:   "구철회" <chkoo at kari.re.kr>
To:     "Felix.Flentge at esa.int" <Felix.Flentge at esa.int>
Cc:     "sis-cfdpv1 at mailman.ccsds.org" <sis-cfdpv1 at mailman.ccsds.org>
Date:   13/04/2022 06:02
Subject:        RE: [SIS-CFDPV1] CFDP WG (Virtual) Meeting



Hi Felix, Can we discuss about what the future direction of CFDP revision 
would be?
Also, can we think about the possibility of much lighter version of CFDP 
Class 1 like tftp (Trivial FTP)?
 
I think much of functions in current CFDP are being done by LTP 
convergence layer. CFDP is very capable of handling file delivery service 
for which LTP/BP is not considered, but when and where LTP/BP are involved 
I feel most functions in CFDP redundancy because similar functions are 
already provided by LTP layer. I think it may be enough if CFDP has some 
critical functions without listing of Metadata/Fdu/NAK/EOF/FIN PDUs, e.g., 
file name, file length, NAK, cancel, file creation/deletion/change and so 
on, like TFTP.
 
I am just curious to know how other people think about this.
 
Cheol 
 
From: SIS-CFDPV1 <sis-cfdpv1-bounces at mailman.ccsds.org> On Behalf Of 
Felix.Flentge--- via SIS-CFDPV1
Sent: Saturday, April 9, 2022 6:05 PM
To: sis-cfdpv1 at mailman.ccsds.org
Subject: [SIS-CFDPV1] CFDP WG (Virtual) Meeting
 
Dear All, 

first, let's see whether this mailing list is still active ... 

It has been very quiet at CCSDS since the publishing of the B5 version. 
However, I assume that a lot of agencies have been busy bringing CFDP into 
their missions. At least I have received some feedback from ESA missions I 
would like to share and discuss with the WG (eg, introduction of an 
Abandon.Request; how to react to NAK for unknown transactions; some 
clarifications). If there is interest, I can also provide some updates 
related the planned Return CFDP PDU Cross-Support Transfer Service Orange 
Book which we need to support Distributed CFDP scenarios. 

If you have other topics to discuss, please let me know. 

I have set-up a doodle poll in order to find a suitable time for a 
meeting: 

https://doodle.com/meeting/participate/id/e73L7POe 

Please enter your availability until 28 April. 

Regards,
Felix 


_________________________________________ 
ESA - European Space Agency 
Dr. Felix Flentge
Software Engineer, OPS-GSB
Ground Systems Engineering Department
Directorate of Operations 
ESA - ESOC
Robert-Bosch-Str.5, D-64293 Darmstadt, Germany 
Phone: +49 6151 90 4075 | Email: Felix.Flentge at esa.int



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