[JDEV] Heartbeat patch for dialup and laptop users and faulty presence info

[Nathan Sharp]

As talked about earlier in this mailing list, I've created a patch to 
the 1.4.2 server which makes the server send blank packets to all 
connected clients once per time period if no other client activity has 
happened.  This allows the server to notice bum connections much faster. 
 I've tested this patch with a number of clients, but certainly not them 
all.  Exodus 0.6.0.0 will stop working if you use this feature, but 
there is a fix in CVS for this (so look out for the next release).  

I'm still not 100% satisfied w/ this solution.  In my testing it can 
still take 10-20 minutes for the server to notice laptop users who pull 
the network cable while connected.  The problem is that the network 
tries to deliver the packets for a long time before giving up.  I'd like 
to eventually add something to handle this, but that will be more work, 
and probably a JEP because it'd require protocol changes.  If anyone has 
ideas or thoughts, I'd be happy to discuss this.

  Nathan

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