RE: [xAP] PC Port Question

["Mark Harrison" <Mark.Harrison@xxxxxxx>]

You can SEND onto the same port from multiple apps, because there's a
difference between Source Port and Destination Port.

Two apps can both send to the same destination port, but have to have
different source ports to run at the same time.

The Destination port is what we care about. For the moment, the source port
is irrelevant.


AIUI, only one application can Listen on a given source port at any time.
I'd been thinking about this in terms of display apps over the last couple
of days, in particular how a Unix program might want to listen, and drive
several serial devices. In the end, I decided that, in practice, it meant
one listener program per PC (but that could, of course, drive multiple
serial devices with different config.)



The complexity comes when control apps start to listen (in order to take
action) rather than just broadcast. This means one app per PC at the
moment... but I'm working on it ;-)

M.



-----Original Message-----
From: Tony T [mailto:tonyt@xxxxxxx]
Sent: 15 August 2002 19:30
To: ukha_d@xxxxxxx
Subject: [ukha_d] [xAP] PC Port Question


Hi All,

I've been reading back thru the xAP posts, and I think the
concept/protocol
is great.

Just wondered if anyone can shed light on a point about pc ports for
me?
Is it possible to have 2 (or more) applications on a single pc
listening/sending on the same port?
I only ask, because I assume those who are using a pc will want it to act
as
more than 1 device/plug-in?

I've been thinking for sometime about breaking up my ha software into a
series of plug-ins (rather than being one app). Being able to use xAP
to
communicate between the core and the plugins would be cool. Plug-in's
would
then be open to use with any system and vice versa.
But if the pc has a listener app running, no other apps could
broadcast?

Many thanks
Tony T




For more information: http://www.automatedhome.co.uk
Post message: ukha_d@xxxxxxx 
Subscribe:  ukha_d-subscribe@xxxxxxx 
Unsubscribe:  ukha_d-unsubscribe@xxxxxxx 
List owner:  ukha_d-owner@xxxxxxx 

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/



________________________________________________________________________
This email has been scanned for all viruses by the MessageLabs SkyScan
service. For more information on a proactive anti-virus service working
around the clock, around the globe, visit http://www.messagelabs.com
________________________________________________________________________

Yahoo! Groups Sponsor

ADVERTISEMENT

For more information: http://www.automatedhome.co.uk
Post message: ukha_d@xxxxxxx 
Subscribe:  ukha_d-subscribe@xxxxxxx 
Unsubscribe:  ukha_d-unsubscribe@xxxxxxx 
List owner:  ukha_d-owner@xxxxxxx

Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.