[jdev] discovery services

[Justin Karneges]

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?

-Justin