RE: Re: Context parameters within Message Bodies

[Ian B]

Hmmm, not sure if that is a fair assumption to make however it is too early
to say for sure at the moment.

I find developing software even in C is very time consuming on an embedded
platform. I will be sorely tempted on my own kit to put in enough to get
the
job done but no more.

an example from the end user maybe
One of the guys on ukha_d has a problem a VIOM would solve nicely but he
has
no spare cabling from the loft to the PC. Imagine the VIOM with Ethernet
for
60 quid (total guess on price) and of course assuming there is network up
there. He would not care about other logic especially as it would push up
the price. Just give it an IP and send and receive commands via whatever
including xAP depending on who builds the module.

I agree Rabbit and other processors could do the serial to Ethernet
bridging
quite easily and even build in some logic too.

I think I am saying maybe we should try to emulate the serial low spec
model
in low spec Ethernet devices and not assume they will have power they may
not have.

It is early days yet and I still have to cross the bridge of soldering a
100
pin chip with .65mm pitch. I am very hopeful though and I have plans
including Ethernet enabling the control for my chicken hutch door sometime
next summer.

Ian (thinking up ever crazier schemes)

>-----Original Message-----
>From: mark_harrison_uk2 [mailto:<a
href="/group/xAP_developer/post?postID=0cc-af-rXD2KqmhVUQLI9Zn3lTobRPaxDHdfDnlIFMftrCi568DT7NBVrTSOv4Q1RxBLTvYOyyG62Ikw2uY">mph@a...</a>]
>Sent: 30 November 2003 21:32
>To: <a
href="/group/xAP_developer/post?postID=Noe--184iQmTRwKooHRtChHo8wOCAjGS-bn1kFIQ7QVtbVJL0oJ7DHhMv_c1Pgkym4Oa12LUsQ6ZDY5ib6PV8Z411SKHrA0l">xAP_developer@xxxxxxx</a>
>Subject: [xAP_developer] Re: Context parameters within Message Bodies
>
>
>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=Noe--184iQmTRwKooHRtChHo8wOCAjGS-bn1kFIQ7QVtbVJL0oJ7DHhMv_c1Pgkym4Oa12LUsQ6ZDY5ib6PV8Z411SKHrA0l">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=Noe--184iQmTRwKooHRtChHo8wOCAjGS-bn1kFIQ7QVtbVJL0oJ7DHhMv_c1Pgkym4Oa12LUsQ6ZDY5ib6PV8Z411SKHrA0l">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=Noe--184iQmTRwKooHRtChHo8wOCAjGS-bn1kFIQ7QVtbVJL0oJ7DHhMv_c1Pgkym4Oa12LUsQ6ZDY5ib6PV8Z411SKHrA0l">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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