Re: Re: xPL Monitor: triple msgs

[Tom Van den Panhuyzen <tomvdp@xxxxxxxxx>]

Hi John,

I changed my setup so that I can test/modify the xPL Hub code.  Both
VMWare virtual network adapters are enabled and everything runs
smoothly.
There is only a minor update necessary to make the socket bind to a
specific ip-address.  The ip-address to bind to should be a
configuration parameter IMHO.  In a pc with more than 1 network card
the xPL Hub listens to all cards, no ?  In a real world scenario you
probably don't want this.
(In fact, I think I saw a few other possible improvements, but I
better shut up being a newbie on the list ;-)

Regards,
Tom





On Sun, 7 Nov 2004 16:30:45, John B <home-automation@xxxxxxx> wrote:
> Hi Tom,
>
> > Aha!  I don't have any of that fancy stuff you mention, but I do
have
> > VMWare...
> > Disabling the VMWare Network Adapters solved the issue!
>
> Cool.
>
> > Any workarounds for this ?  What is actually happening ?  Are
these
> > messages "phantom messages" as you describe them, or is
a command
> > really picked up 3 times by the X10 device ?  I think it is the
> > latter.
> > I guess that I could examine the source code of xPL Hub V2.5 to
see
> > how it all works.  This is the same code that is included in xPL
Hal,
> > is it not ?
>
> Yes, it's pretty much the same code.
>
> What happens is this:
>
> The hub binds to all local IP interfaces on the IANA-assigned xPL port
3865
> UDP.
>
> When xPL apps transmit, by default they use the broadcast address
> 255.255.255.255, so Windows routes the UDP packet to each of the
listening
> IP interfaces, so the hub sees one message for each interface that it
is
> bound to.
>
> One way round this is to allow a mechanism for the user to specify
which
> interface the hub should bind to - this should aboid the problem of
> duplicate messages.
>
> Regards,
>
> John
>
>
>
>
>
> xPL Links: http://www.xplproject.org.uk http://www.xplhal.com
> http://www.xpl.myby.co.uk
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