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Re: Serial bridge availability
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I think the definition of serial bridge here is a serial based (RS232 or
RS485) device that participates in a 'conventional' UDP broadcast/ethernet
xAP network.
Typically this is achieved either using either a PC - and passing xAP
messages from the IP network to serial port and vice versa, or using an
embedded device such as the lantronix IP to serial converters. I have
implemented both at various points... it's useful for integrating really
low
end/low power devices such as temperature or movement sensors into the xAP
world whilst minimising the overall number of moving parts/improving
reliability over alternative approaches.
HTH
Patrick
2010/1/6 brett england <brett@xxxxxxx>
>
>
> As in IP ->> Serial link ->> IP
>
>
>
> Well I guess you could implement PPP on the serial link and the packet
> would just broadcast as per usual, if is on the same subnet.
>
> Failing that writing a bridge wouldn't be too difficult.
>
> What are you trying to do?
>
> Brett
>
>
>
> *From:* xAP_developer@xxxxxxx [mailto:
> xAP_developer@xxxxxxx] *On Behalf Of *Neil Wrightson
> *Sent:* 06 January 2010 10:51
> *To:* xAP_developer@xxxxxxx
> *Subject:* [xAP_developer] Serial bridge availability
>
>
>
>
>
> Hi All,
>
>
>
> Does a serial bridge exist for xAP?
>
>
>
> I.e.
> Bridging
>
> xAP is, so far is as practicable, network agnostic. Where two networks
are
> to be joined, so that xAP messages can be passed between then, a
software
> bridge is used. The bridge understands the implementation details of
the xAP
> protocol on each physical network, and performs the necessary protocol
> conversions to pass the message from one network to another.
>
> In some cases, the bridge may provide a configuration interface to
allow
> traffic in one or both directions to be restricted.
>
> A proposal has been made to permit messages to be flagged
"non-routable" in
> the xAP-Header, and for bridges to never pass these messages.
Currently this
> item is still open.
>
> Messages passed over the bridge always have the xAP-header hop count
> increased. A bridge may be configured to discard messages with
hop-count > n
> to prevent looping/broadcast storms.
>
>
>
> Regards,
>
> *Neil Wrightson.*
>
>
>
>
>
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I think the definition of serial bridge here is a serial based (RS232 or
RS=
485) device that participates in a 'conventional' UDP
broadcast/eth=
ernet xAP network.<br><br>Typically this is achieved either
using either a =
PC - and passing xAP messages from the IP network to serial port and vice
v=
ersa, or using an embedded device such as the lantronix IP to serial
conver=
ters. I have implemented both at various points... it's useful for
inte=
grating really low end/low power devices such as temperature or movement
se=
nsors into the xAP world whilst minimising the overall number of moving
par=
ts/improving reliability over alternative approaches.<br>
<br>HTH<br>Patrick<br><br><div
class=3D"gmail_quote">2010/1/6 brett england=
<span dir=3D"ltr"><<a href=3D"mailto:brett@xxxxxxx";>brett@xxxxxxx</=
a>></span><br><blockquote
class=3D"gmail_quote" style=3D"border-left: 1p=
x solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left:
1ex;">
=20=20=20=20=20=20=20=20
<div bgcolor=3D"white" link=3D"#1E66AE"
vlink=3D"#1E66AE" lang=3D"EN-GB">
<br><br>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:
11pt; color: rgb(31, 73, 1=
25);">As in IP ->> Serial link ->> IP
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:
11pt; color: rgb(31, 73, 1=
25);">=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:
11pt; color: rgb(31, 73, 1=
25);">Well I guess you could implement PPP on the serial link and
the
packet would just broadcast as per usual, if is on the same
subnet.</span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:
11pt; color: rgb(31, 73, 1=
25);">Failing that writing a bridge wouldn't be too
difficult.</span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:
11pt; color: rgb(31, 73, 1=
25);">What are you trying to do?</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:
11pt; color: rgb(31, 73, 1=
25);">Brett</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:
11pt; color: rgb(31, 73, 1=
25);">=A0</span></p>
<div>
<div style=3D"border-style: solid none none; border-color: rgb(181,
196, 22=
3) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium
medium=
; padding: 3pt 0cm 0cm;">
<p class=3D"MsoNormal"><b><span
style=3D"font-size: 10pt;" lang=3D"EN-US">F=
rom:</span></b><span style=3D"font-size: 10pt;"
lang=3D"EN-US"> <a href=3D"=
mailto:xAP_developer@xxxxxxx";
target=3D"_blank">xAP_developer@yahoo=
groups.com</a>
[mailto:<a href=3D"mailto:xAP_developer@xxxxxxx";
target=3D"_blank">=
xAP_developer@xxxxxxx</a>] <b>On Behalf Of </b>Neil
Wrightson<br>
<b>Sent:</b> 06 January 2010 10:51<br>
<b>To:</b> <a href=3D"mailto:xAP_developer@xxxxxxx";
target=3D"_blan=
k">xAP_developer@xxxxxxx</a><br>
<b>Subject:</b> [xAP_developer] Serial bridge
availability</span></p>
</div>
</div><div><div></div><div
class=3D"h5">
<p class=3D"MsoNormal">=A0</p>
<p class=3D"MsoNormal">=A0 </p>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:
10pt;">Hi
All,</span></p>
</div>
<div>
<p class=3D"MsoNormal">=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:
10pt;">Does
a serial=A0bridge exist for xAP?</span></p>
</div>
<div>
<p class=3D"MsoNormal">=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:
10pt;">I.e.</span></p>
</div>
<div>
<h2><span>Bridging</span></h2>
<p><span style=3D"font-size: 10pt;">xAP is, so
far is as practicable, network agnostic. Where two networks are to be
joine=
d,
so that xAP messages can be passed between then, a software bridge is
used.=
The
bridge understands the implementation details of the xAP protocol on each
physical network, and performs the necessary protocol conversions to pass
t=
he
message from one network to another. </span></p>
<p><span style=3D"font-size: 10pt;">In some
cases, the bridge may provide a configuration interface to allow traffic
in=
one
or both directions to be restricted. </span></p>
<p><span style=3D"font-size: 10pt;">A proposal
has been made to permit messages to be flagged
"non-routable" in =
the
xAP-Header, and for bridges to never pass these messages. Currently this
it=
em
is still open. </span></p>
<p><span style=3D"font-size: 10pt;">Messages
passed over the bridge always have the xAP-header hop count increased. A
br=
idge
may be configured to discard messages with hop-count > n to prevent
looping/broadcast storms. </span></p>
</div>
<div>
<p class=3D"MsoNormal">=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:
10pt;">Regards,</span>
</p>
</div>
<div>
<p><b><span style=3D"font-size: 13.5pt;">Neil
Wrightson.</span></b> </p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:
white;"></span></p>
</div>
</div>
<br>
=20=20=20=20
=20=20=20=20
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iv>
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