Re: [6lowapp] Architecture Sketch in Charter

[Cullen Jennings <[e-mail]>]

All these things sound great, but pealing away the excitement how do  
we find some protocols, that if we define them, would enable the type  
of exciting intelligent network you are are thinking about. For  
example, much of what made things like gmail and facebook possible are  
a handful of technologies: JavaScript, HTML, HTTP, TLS, TCP, DNS, IP  
and routing. How can we find a few simple technologies that when  
implemented in standardized ways between vendors would enable the  
stuff you are talking about. What's missing? What do we need. I'm  
trying to drag this back to an engineering task.

PS - On topic of XMPP and SIP. No argument from me that these are not  
important protocols for real time applications. I'm perfectly happy to  
see them includes as things to consider.

On Oct 31, 2009, at 4:41 PM, Shidan wrote:

> Hi Fluffy,
>
> I definitely agree with your overall sentiment, but one thing that I  
> always find dissapointing is when people give me the "turn on and  
> off" garage doors, thermostats, etc as the only examples of what a  
> HAN should be about. I think this is part of the reason some,  
> specially me, are a little confused by the WG.
>
> The truth is, I'm personally not looking for a X10, legacy 802.15.4,  
> KNX, etc replacement; they do a fine job of turning things on and  
> off. Let me list a few things I would like in my HAN:
>
> 1) I want a network that goes beyond enabling me to discover and  
> control a device to one that enables devices to discover, control  
> and communicate with each other and mixed groups of devices and  
> people.
>
> 2) I want devices to do things based on time and other arbitrary  
> policies as part of the network
>
> 3) I want mobile & secure smart objects to take advantage of  
> pervasive global networks and objects that are location aware.
>
> 4) I want a system that can evolve so that when it makes economic  
> sense, the physical components of a smart appliance are "smart  
> components" themselves. I also see a day when people will be  
> upgrading the features and functionality of their washing machine  
> through a
> firmware upgrade.The last two are probably sound silly now, but  
> they're real considerations of how things can evolve.
>
> The truth of the matter is that even with X10 and gateways, except  
> for device mobility, most of this is possible. It's further true  
> that the most difficult challenge of HANs is not the networking but  
> end user programmability and moving intelligence to the network will  
> help in developing these systems.
>
> Right now, the difficulty I'm having is that it almost seems, and  
> this could be a wrong interpretation I hope, that this working group  
> is saying "let's forget about addressing the greater problem of HANs  
> through network intelligence and let's just focus on satisfying the  
> bare minimum needs of the energy industry so they can move to IP"  
> and "then we will let the system evolve."
>
> Another approach could be that this working group could start by  
> considering the HAN application layers like UPnP and see how they  
> need to evolve for pervasive access, where they have gone wrong for  
> developers and so on and then see how much of this better system you  
> define can be brought down to LoPANs. This is something I think can  
> be done in the time frames this WG has proposed and anything that  
> comes out of it would work great for the energy industry as well.
>
> Of course, even better would be a general application layer  
> framework for LoPANS, but since this is technological limitation, I  
> think looking at requirements is absolutely necessary.
>
> A side note, I definitely think SIP and XMPP are relevant in this  
> field Cullen, there is a reason why so many M2M applications are  
> using XMPP, specially in BRIC countries. There is also a reason why  
> the leading demand response provider is using XMPP today, if you can  
> take this all the way to the home and on AMI networks then why not?  
> There is also a reason why the few MSOs and incumbents that I know  
> of who are offering home media management  and media delivery to  
> connected devices are switching to SIP-DLNA gateways. Again, this is  
> not even the real issue, who really cares what you name a protocol  
> as long as it works and the proper requirements have been  
> considered. My concern above is much more important.
>
> Shidan Gouran
>
> On Sat, Oct 31, 2009 at 1:42 PM, Cullen Jennings <[e-mail]>  
> wrote:
>
> Right now the draft charter has a sketch of some of the key parts of  
> the architecture. I'd like to talk about the pro's and cons of  
> putting this in a charter. Typically charters don't have this. Many  
> BOFs fail when all the people in the room don't lave having a common  
> idea of what the group will do. Typically  the architecture is  
> developed in a draft and often can take considerable time however  
> there's nothing stopping this type of information form being in a  
> charter. Now this effort is a bit different from your typically BOF.  
> Let me list some differences:
>
> 1) This is not meant to run on normal networks. We've told the  
> transport folks, yah, we are going to have to make different  
> assumptions than normal application protocols make because there  
> some special stuff going on here. That makes the Transport and INT  
> people very nervous.
>
> 2) We told the security people, none of your off the shelf security  
> approaches will work for us because we have special requirements. We  
> are not even 100% sure it is feasibly to simultaneously satisfy all  
> the requirements. That makes the Security people, uh, prickly.
>
> 3) Some people have suggest that SIP might be just the thing to  
> build on over for things like controlling a garage door opener.   
> Many (but not all) SIP folks feel that SIP is for User to User  
> communications and often use SIP to control the garage door and the  
> prototypical example of what should *not* be done with SIP. This  
> makes the RAI people want to come and say "hi". I'm not saying we  
> could not use SIP but I am saying the SIP people would want to come  
> and talk about the issues before that decision got made. Hopefully  
> they won't ask if any of this has any real time application  
> properties or infrastructure they could help with.
>
> 4) The OAM folks must be thinking, so how is this different from  
> what we do every single day?
>
> 5) The INT and Routing guys want to know how this related to work  
> they are doing.
>
> 6) I've had a few questions that loosely translated to "so what  
> feature of IPv6 are you using to guarantee that this will only work  
> on a v6 network".
>
> If we told the DNS guys we were consider doing all our senor reading  
> use DNS so we could leverage the DNS caching we would have pretty  
> much every area "concerned".
>
> People have questions. Lots of questions. The challenge for a  
> successful BOF like this is to put together a coherent story of what  
> the big picture looks like and how it all hangs together. I believe  
> we have a reasonable chance of having a WG approved if we can show  
> that there is a group of people that have
>
> 1) a clear idea of what they want to build
>
> 2) the same common idea of what it is
>
> 3) it is an engineering project, and not science project requiring  
> invention of new techniques
>
> 4) it meets the type of requirements the IETF has for standards  
> track work
>
> The quickest way to do this would be to have in some document that  
> we take into the BOF use cases, requirements, and a high level  
> architecture. We have drafts with use case and requirements and we  
> can refine theses int he slides used in the BOF. If we can agree on  
> an architecture, we can stuff that in the charter.
>
> I'm probably a bit naive to think we can come up with a sketch of an  
> architecture and agree to it in the BOF. But if we do, we have a  
> chance at having the a protocol document finished before 2011.
>
> A more tried and true approach to this would be to work on the  
> requirement, use case, and architecture in some ad-hoc meetings then  
> go for a BOF. The P2PSIP WG had problems similar to this WG in that  
> they were going to have some harder than average transport and  
> security issues. They meant for multiple hours at every IETF for  
> multiple years *before* the WG was approved. Lots of the meetings  
> had around 100 people with pretty substantial effort.
>
> Another approach would be to charter just to do requirements then  
> recharter to do the protocols. I'd bet anyone on odds of a bottle of  
> beer to a bottle of scotch that would not finish before 2011 and  
> even odds on a bottle of scotch it would not finish before 2012.
>
> Many people have expressed that time is of the essence on this work  
> and something that delivers in 2012 will be of very little  
> deployment value. I'm not in a good position to evaluate how quickly  
> something is needed here but I'm happy to take everything people  
> tell m at when this is needed at face value.
>
> The sponsoring AD has read me the riot act on scope for the initial  
> set of work, make this a small bite size chunk that meets a  
> reasonable set of needs and we can complete quickly. As that  
> completes, I'm sure there would be no problem re-charting to expand  
> the scope for more things or forming other WG to take on related work.
>
> So bottom line, I'm trying to drive this to figure out what is small  
> bite size chunk that everyone could live with for the initial stuff  
> to be worked on. If we are lucky, we can end up agreeing on  
> requirements, uses cases, and a high level sketch of the  
> architecture without a long drawn out process.  If this fails, and I  
> admit it very well could, well then we can just move back to some  
> other way of dealing with this.
>
> A good charter is a plan for work as well as something that  
> constrains the number of possibilities a WG has to consider. Now  
> clearly we can't constrain things beyond what is needed. If we can  
> mange to agree on a tight charter, the WG will be able to progress  
> work very rapidly. If we fail to do this in the next few week,  
> having tried will not set back the work in any significant way.
>
> I hope this explains, I'm not  trying to convince anyone the  
> architecture in the draft is the right one.  I'm just trying to  
> convince people to fix it before the BOF.
>
> Sorry for such a long email,
> Cullen
>
>
>
>
>
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