On Fri, Mar 20, 2009 at 1:22 AM, Fabio Forno <fabio.fo...@gmail.com> wrote:
>> Of course, I still question the need for 'u' at all if we're doing it like >> this. > > Now I remember: for limiting latency it's better to allow a window of > unacked stanzas (on slow mobile connections each roundtrip can be 2-3 > seconds) Sleep is always beneficial. No need of a sequence number also for multiple unacked stanzas. Example: ---- start session, both client and server reset their counter --- C,u=1: <message/> C,u=2: <message/> C,u=3: <message/> S: <a h="3"/> <--- messages arrived too fast, the server has sent a single ack for all C,u=4: <message/> ==== first case ==== ---- broken link, the server has received u=4 and processed it, but it didn't succeed in sending back the ack ---- ---- resume session: client sends u=4, server h=4, no need to resend u=4 ---- ---- new conversation follows ---- ==== second case ==== ---- broken link, the server hasn't received u=4 and processed it ---- ---- resume session: client sends u=4, server h=3, client resends u=4 ---- C,u=4: <message/> ---- new conversation follows ---- -- Fabio Forno, Ph.D. Bluendo srl http://www.bluendo.com jabber id: f...@jabber.bluendo.com
