[jdev] discovery services
julian at jabber.org
Wed Mar 23 17:49:38 CST 2005
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
> 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.
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