Re: [cf-dev] Question about Multicast Implementation

["Hudalla Kai (INST/ESY1)" <Kai.Hudalla@xxxxxxxxxxxx>]

I guess I would first go through the draft ...
I can take a look at it during the next days but I can't promise anything, sorry.
But there will probably be some changes necessary in the DTLS layer (Scandium),
so you might want to take a look at it in any case ...
-- 
Mit freundlichen Grüßen / Best regards

Kai Hudalla
Chief Software Architect

Bosch Software Innovations GmbH
Schöneberger Ufer 89-91
10785 Berlin
GERMANY
www.bosch-si.com

Registered office: Berlin, Register court: Amtsgericht Charlottenburg,
HRB 148411 B;
Executives: Dr.-Ing. Rainer Kallenbach, Michael Hahn

On Wed, 2017-02-22 at 08:45 +0100, Thorsten Rick wrote:
> Would you have a basic idea of which californium classes I must  
> consider for the implementation. Since the number of classes involved  
> is quite large.
> 
> Thanks for The fast reply.
> 
> Zitat von "Hudalla Kai (INST/ESY1)" <Kai.Hudalla@xxxxxxxxxxxx>:
> 
> > This draft is currently not supported by Californium and (to my  
> > knowledge) there
> > is also no work going on to add support for it.
> > 
> > So, if you want to start working on it and contribute it to  
> > Californium, we may
> > be able to support you in the process. However, my personal priorities are
> > different ones currently ...
> > 
> > --
> > Mit freundlichen Grüßen / Best regards
> > 
> > Kai Hudalla
> > Chief Software Architect
> > 
> > Bosch Software Innovations GmbH
> > Schöneberger Ufer 89-91
> > 10785 Berlin
> > GERMANY
> > www.bosch-si.com
> > 
> > Registered office: Berlin, Register court: Amtsgericht Charlottenburg,
> > HRB 148411 B;
> > Executives: Dr.-Ing. Rainer Kallenbach, Michael Hahn
> > 
> > On Tue, 2017-02-21 at 23:32 +0100, Thorsten Rick wrote:
> > > Hi Kai,
> > > 
> > > thanks for the fast reply.
> > > I am trying to implement a multicast DTLS communication as it is  
> > > explained in the draft:
> > > https://tools.ietf.org/html/draft-keoh-dice-multicast-security-08
> > > 
> > > Best regards
> > > Thorsten Rick
> > > 
> > > 
> > > 
> > > Zitat von "Hudalla Kai (INST/ESY1)" <Kai.Hudalla@xxxxxxxxxxxx>:
> > > 
> > > > Hi Thorsten,
> > > > 
> > > > I am not completely sure about what you want to achieve. However,  
> > > 
> > > doing CoAP
> > > > multicast is currently only defined for UDP transpor.
> > > > RFC 7252, Section 8.1 states the following:
> > > > 
> > > > "At the time of writing, multicast messages can only be carried in UDP
> > > >    not in DTLS.  This means that the security modes defined for CoAP in
> > > >    this document are not applicable to multicast."
> > > > 
> > > > As such, Californium does not support multicast over DTLS. It is  
> > > 
> > > supposed to
> > > > support multicast over UDP. I have to admit, though, that this is  
> > > > not really my
> > > > area of expertise and my organization doesn't have any usecase based  
> > > > on multicast
> > > > at the moment. There seems to be some interest in the community for doing
> > > > multicast, though, and there have been issues found with  
> > > > Californium's multicast
> > > > implementation already [1].
> > > > 
> > > > All in all, I would say that Californium definitely strives for
> > > > supporting
> > > > multicast (over UDP) but currently has some issues with it. So,  
> > > 
> > > if you feel
> > > > motivated to give us a hand, you would be more than welcome to e.g.  
> > > > continue the
> > > > work started in [1].
> > > > 
> > > > [1] https://github.com/eclipse/californium/pull/95
> > > > --
> > > > Mit freundlichen Grüßen / Best regards
> > > > 
> > > > Kai Hudalla
> > > > Chief Software Architect
> > > > 
> > > > Bosch Software Innovations GmbH
> > > > Schöneberger Ufer 89-91
> > > > 10785 Berlin
> > > > GERMANY
> > > > www.bosch-si.com
> > > > 
> > > > Registered office: Berlin, Register court: Amtsgericht Charlottenburg,
> > > > HRB 148411 B;
> > > > Executives: Dr.-Ing. Rainer Kallenbach, Michael Hahn
> > > > 
> > > > On Tue, 2017-02-21 at 12:51 +0100, Thorsten Rick wrote:
> > > > > Hi list,
> > > > > 
> > > > > I have a question about a basic multicast CoAp DTLS implementation.
> > > > > 
> > > > > I am currently working on a proof-of-concept for my Masterthesis by  
> > > > > using a CoAp DTLS PSK implementation.
> > > > > I have been able to successfully implement a basic secure unicast  
> > > > > communication, but for a few days I have been trying to implement a  
> > > > > multicast communication without a result. My question is whether in  
> > > > > the current version a multicast solution is possible at all and if so  
> > > > > if someone has an exemplary implementation.
> > > > > 
> > > > > 
> > > > > Thanks in advance
> > > > > T. Rick
> > > > > 
> > > > 
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> > 
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