On 23 Mar 2005, at 18:33, Justin Karneges wrote:
On Wednesday 23 March 2005 02:07 pm, Julian Missig wrote:I don't mean to be presumptuous or rude, but I really don't think you've thought through DNS-SD and how peer-to-peer Jabber would work with it nearly enough...
Probably not. I was just trying to see how much of our own protocol we could
re-use. I had not yet considered "oob"erizing presence.
There's a local subnet. It has 50 users on it. How are you expecting that those 50 users will get one another's presence? DNS-SD means that we can treat the "service" as a presence packet (because really, it is advertising the availability of a service) and advertise our presence as a DNS-SD service. There's no need to open up 50 TCP connections and send <presence/> packets to all 50. It's all handled by Multicast DNS for us. There's no "Jabber connection" taking place until one user wants to send a message to another--then we're opening a TCP socket and sending a <message>.
Does this mean that <presence> is never delivered over a Jabber connection,
even if there is an existing connection due to some message exchanging? What
about directed presence?
Yes. If you really want directed presence, it could in theory be sent over the TCP connection. iChat doesn't support directed presence at all.
Julian
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