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

[David Waite]

David Waite wrote:

>
> As a counterpoint, however - a single-byte application-level ping/pong 
> is still going to take a minimum of 82 bytes of network traffic. It is 
> likely that for five million online users, the ~7MB/s traffic a 
> once-a-minute ping/pong would generate might not considered worth it.

Whoops, messed up my own numbers - it would be a minimum of 162, or ~14 MB/s