Re: Context parameters within Message Bodies

[mark_harrison_uk2]

I'd been imagining Rabbit, simply because I have one (it provides xAP
control for my hifi and could also bridge to xAP-serial without
breaking into a sweat.)

I would suggest that anything serial can get away with
being "dumb"...

... wheras anything with ethernet / wireless should look at having a
bit more horsepower / capability.

M.

--- In <a
href="/group/xAP_developer/post?postID=1oLrJYPPWH0oLzwEj42UUzt2Qtt_D1zf87MmJ4GOmD7AIFgheszwqeJu0g7sdFmanulBxnyH5_2rkQlspRrlGSOmT8Q6">xAP_developer@xxxxxxx</a>,
"Ian B" <Ian@M...> wrote:
> Ah, I may be one step ahead of you here then. I have just ordered an
> embedded Ethernet development kit which I am hoping will enable me
to add
> Ethernet as the native interface for my new devices. It will use
the Realtek
> chip found on your average 7 quid network card so I am hoping the
cost per
> project will not be huge and certainly bring it into the region you
are
> looking at below. We shall see.
>
> Whilst serial (485) is still a very cheap interface as far as a
networked
> medium goes it is not supported in 99% of homes. This applies even
to my own
> where I have a 100Mbit Ethernet pretty much everywhere but not a
serial
> cable anywhere save to HV and the phone logger. The watering etc.
use
> dedicated cables and not a serial link.
>
> This and feedback from various sources have led me towards
Ethernet. I think
> this could fit into a 16k Atmel chip costing around a fiver so it
still
> counts as a low end device in my book.
>
> I am hoping that new devices will come in around the price point
you are
> looking at but in small quantities. This obviously depends on the
> capabilities and interactive stuff with screens etc. will push the
price up.
> Something like my I/O controller will come in at the lower end of
the scale.
>
> What do you think?
>
> Ian
>
>
> >-----Original Message-----
> >From: mark_harrison_uk2 [mailto:mph@a...]
> >Sent: 30 November 2003 20:47
> >To: <a
href="/group/xAP_developer/post?postID=1oLrJYPPWH0oLzwEj42UUzt2Qtt_D1zf87MmJ4GOmD7AIFgheszwqeJu0g7sdFmanulBxnyH5_2rkQlspRrlGSOmT8Q6">xAP_developer@xxxxxxx</a>
> >Subject: [xAP_developer] Re: Context parameters within Message
Bodies
> >
> >
> >OK - I should have explained better :-)
> >
> >I can see a situation where the logic is actually interpreted in
> >something like an ethernet<->serial xAP bridge.
> >
> >On the serial side, we have PIC devices which are basic input /
> >output type telemetry modules.
> >
> >On the ethernet side we have more sophisticated stuff, including
all
> >the PC-based applications we have today.
> >
> >The hybrid-bridge in the middle MIGHT be a PC, but is equally
likely
> >to be something, say, Rabbit-based.
> >
> >However, rather than simply passing the same xAP messages from one
> >side to another, it could process them, and take into account
> >state... thus leading IT to be the "rules engine".
> >
> >With any decent volumes, a Rabbit-based device could hit a £100
price
> >point today. In the next couple of years, we'll see the power of
> >devices at that price point go up, and likewise the cost of
devices
> >at that power point go down.
> >
> >Such a device would be a FRACTION of the cost of a Homevision, and
> >compared to anything comparable would blow it out of the water.
> >
> >Mark
> >
> >--- In <a
href="/group/xAP_developer/post?postID=1oLrJYPPWH0oLzwEj42UUzt2Qtt_D1zf87MmJ4GOmD7AIFgheszwqeJu0g7sdFmanulBxnyH5_2rkQlspRrlGSOmT8Q6">xAP_developer@xxxxxxx</a>,
"Ian B" <Ian@M...> wrote:
> >> >Yes I agree (been there - got the T shirt)... but what
you are
> >saying is
> >> >that end nodes ultimately will be receiving compiled
scripts
> >(xAPscripts)
> >> >telling them how to interpret the various schemas - sort
of
blows
> >the small
> >> >pic based end nodes out of the water. Where, and who is
developing
> >> this......
> >>
> >> I second this as from experience xAP has pushed me towards
ever
> >more capable
> >> processors to keep up with even the relatively simple tasks.
> >>
> >> My ideas around the house have a lot to do with networking
> >(Ethernet) small
> >> nodes at the moment and to be honest the vast majority of
folks
> >interested
> >> in HA maybe won't have a PC on 24/7. To keep our appeal as
wide
as
> >possible
> >> we should keep the hardware requirements as low as possible
> >wherever we can.
> >>
> >> Don't get me wrong as I also believe the PC/Linux/etc. has a
place
> >in this
> >> somewhere. I remember how lost I was when my own server went
down
> >for a
> >> fortnight with a blown motherboard and power supply.
> >>
> >> Ian
> >
> >
> >
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