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RE: Nuts and Bolts of a hub-app protocol
- Subject: RE: Nuts and Bolts of a hub-app protocol
- From: "Patrick Lidstone \(Personal e-mail\)" <patrick@xxxxxxxxxxxx>
- Date: Sun, 10 Oct 2004 13:56:37 +0100
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Michael,
Who's hub are you using, and which version? There are some subtle
differences between the flavours...
What you have described is basically correct: at startup, a connecting
app should send a heartbeat to the hub on port 3639, indicating which
port it is using for incoming messages. The port the application chooses
should be an unused (udp) port in the ephemeral port range (although
some early xap apps just allocated sequentially from 3639 onwards). Once
the heartbeat has been received, the hub should broadcast on
127.0.0.1:<allocated_port>. Early versions of some hubs incorrectly
used
the real ip address instead, although the principle was the same.
Rebroadcast on the allocated port by the hub will continue until at
least twice the hearbeat timeout interval, specified in the original
heartbeat message from the app to the hub, has expired.
HTH
Patrick
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<DIV><SPAN class=152183011-10102004><FONT face=Arial
color=#0000ff
size=2>Michael,</FONT></SPAN></DIV>
<DIV><SPAN class=152183011-10102004><FONT face=Arial
color=#0000ff size=2>Who's
hub are you using, and which version? There are some subtle differences
between
the flavours...</FONT></SPAN></DIV>
<DIV><SPAN class=152183011-10102004><FONT face=Arial
color=#0000ff size=2>What
you have described is basically correct: at startup, a connecting app
should
send a heartbeat to the hub on port 3639, indicating which port it is using
for
incoming messages. The port the application chooses should be an
unused
(udp) port in the ephemeral port range (although some early xap
apps just
allocated sequentially from 3639 onwards). Once the heartbeat has
been
received, the hub <EM>should</EM> broadcast on
127.0.0.1:<allocated_port>.
Early versions of some hubs incorrectly used the real ip address instead,
although the principle was the same. Rebroadcast on the allocated port by
the
hub will continue until at least twice the hearbeat timeout interval,
specified
in the original heartbeat message from the app to the hub, has
expired.</FONT></SPAN></DIV>
<DIV><SPAN class=152183011-10102004><FONT face=Arial
color=#0000ff
size=2>HTH</FONT></SPAN></DIV>
<DIV><SPAN class=152183011-10102004><FONT face=Arial
color=#0000ff
size=2>Patrick</FONT></SPAN></DIV><!-- **end egp
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