RE: xPL Hal in a loop

["Ian Lowe" <ian@xxxxxxxxxxxxxxxxxx>]

There was a discussion along these lines about a year ago - looking at
the use of a completely separate xpl-cnfg message type for configuration
purposes - and we opted instead to basically stick with the message
types we had, and try to implement the configuration process with that
(as a test to see if the extra message type was required)

The only reason I can see for not going the xpl-cnfm route... is that
none of the protocol's behaviour is really optional. It's perhaps the
key issue that made xAP so unpalatable - that chunks of the protocol
were optional and might (or might not) be present in a given message,
dependant not on some nice defined rule, but rather on whether the
individual developer liked them or not!

I can see that there's a gotcha in the X10 handling in xplhal, but I
think the fix for this should involve a wee change to xplhal's
behaviour, rather than an addition to the protocol.

Just my 2p.

Ian.

-----Original Message-----
From: Mal Lansell [mailto:mlansell@xxxxxxx]
Sent: 10 September 2004 09:22
To: ukha_xpl@xxxxxxx
Subject: Re: [ukha_xpl] xPL Hal in a loop


Thoughts?  Anyone?

Mal

----- Original Message -----
From: "Mal Lansell" <mlansell@xxxxxxx>
To: <ukha_xpl@xxxxxxx>
Sent: Wednesday, September 08, 2004 9:51 AM
Subject: Re: [ukha_xpl] xPL Hal in a loop


>
> It's tricky.
>
> I would have expected an X10 status message to be used to report the
state
> of an X10 device itself (via a status request of an X10 device that
supports
> it), whereas the X10.confirm is merely reporting that the CM12 has
sent
the
> message down the powerline.
>
> The built in support for X10 in xPLHal is surely there to aid the user
in
> setting up useful scripts - i.e. to avoid having to write real code
> themselves (hence the wizard).  If that's a goal, it doesn't make
sense
that
> they shouldn't have to filter X10.confirm messages themselves.
>
> I actually wonder whether the x10.confirm message is even necessary.
After
> all, it only reports whether the message was put on the powerline, not
> whether the X10 device reacted to it (impossible to know anyway since
status
> request is missing from most X10 devices).
>
> If confirmation is deemed necessary, then why not support confirmation
of
> any xPL message in a generic way, rather than by inventing special
> modifications for each schema.  This could be done by adding xpl-cnfm
as a
> message type like xpl-stat, xpl-cmnd, and xpl-trig.  It would just
echo
back
> the contents of the received message (i.e. the same schema).  It would
not
> be mandatory for a service to confirm messages, but the specification
would
> be there for those that wanted to do it, with no chance that they
would be
> mistaken for something else.
>
> Mal
>
>
>
>
>
>
>
> ----- Original Message -----
> From: "Tony Tofts" <tony@xxxxxxx>
> To: <ukha_xpl@xxxxxxx>
> Sent: Wednesday, September 08, 2004 5:47 AM
> Subject: RE: [ukha_xpl] xPL Hal in a loop
>
>
> > > The above script should only fire when B2 is actually
> > > switched on - not in response to a confirmation message, and
> > > it shouldn't be up to the user to check the schema
themselves.
> >
> > Hi Guys,
> >
> > I can't really agree here.
> >
> > There are 3 types of event (status, trigger, command) and the
particular
> > event called is controlled by this type.
> >
> > Even though x10 is built-in, it should be treated no differently
to
any
> > other schema. If we start putting in exceptions for this, we'll
set
a
> > precedent to start hardcoding exceptions for other schemas? Which
to
me
> > seems to defeat the point of the scripting system.
> >
> > If anything it seems to indicate that x10.confirm should be a
status
> rather
> > than a trigger?
> >
> > Thoughts?
> >
> > Many thanks
> > Tony
> >
> >
> >
> >
> > xPL Links: http://www.xplproject.org.uk http://www.xplhal.com
> http://www.xpl.myby.co.uk
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> >
> >
> >
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>
>
>
> xPL Links: http://www.xplproject.org.uk http://www.xplhal.com
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