Re: [lp-wan] C Implementation of SCHC ?

[<[e-mail]>]

Hello Hannes,

Indeed, I agree that the SCHC acronym is kind of a misnomer.
SCHC&FR would be technically more accurate, but totally un-pronounceable.
The common part is SC (Static Context). HC (Header Compression) and FR (Fragmentation/Reassembly) are mostly independent, except they share the same RuleID (name)space.
>  as well as support for reliable transmission of packets.
Actually,  it includes support for reliable transmission of fragments. If the packet is compressed but not fragmented, there Is no reliability mechanism added.
Unless the implementer decides to use the fragmentation mechanics just for the benefit of reliability, even if fragmentation itself is not required.
Best regards,

Dominique

De : Hannes Tschofenig <[e-mail]<mailto:[e-mail]>>
Date : Saturday 19 October 2019 18:08
À : Dominique Barthel <[e-mail]<mailto:[e-mail]>>
Cc : lp-wan <[e-mail]<mailto:[e-mail]>>
Objet : RE: [lp-wan] C Implementation of SCHC ?

Thanks, Dominique.

Regarding the implementation question I cannot really help because I don’t know what the RIoT guys are trying to accomplish.

I was actually surprised to see that the work on static header compression is actually much more than compression. It includes a protocol for fragmentation and reassembly as well as support for reliable transmission of packets.

Ciao
Hannes

From: [e-mail]<mailto:[e-mail]> <[e-mail]<mailto:[e-mail]>>
Sent: Freitag, 18. Oktober 2019 18:11
To: Hannes Tschofenig <[e-mail]<mailto:[e-mail]>>
Cc: lp-wan <[e-mail]<mailto:[e-mail]>>
Subject: Re: [lp-wan] C Implementation of SCHC ?

Hello Hannes,

I don't know of a SCHC implementation at this time.
The closest I know to an implementation is the RiOT guys intention of adding SCHC to RioT. AFAIK, they were debating whether to rewrite SCHC in C or run micropython over RioT.

Regarding papers, I'm aware of a paper being submitted by S. Aguilar et al. (IMT Atlantique, Rennes and UPC, Barcelona) but I'm not sure what its status exactly is.
I'll let the authors come out of the wood.
A quick search on ieeeexplore with the keyword "SCHC" returned two relevant papers (published this summer), YMMV.
What performance are you interested in ? Compression, fragmentation, .. ?

Best regards

Dominique

De : lp-wan <[e-mail]<mailto:[e-mail]>> on behalf of Hannes Tschofenig <[e-mail]<mailto:[e-mail]>>
Date : Friday 18 October 2019 16:55
À : lp-wan <[e-mail]<mailto:[e-mail]>>
Objet : [lp-wan] C Implementation of SCHC ?

Hi all,

I was searching for a C implementation of SCHC and only found Python and JavaScript implementations. Can someone send me a pointer to a C implementation?

I also recall a paper being distributed about the performance of SCHC but I cannot find that either. A pointer would be great.

Thanks.

Ciao
Hannes
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