[JDEV] Presence probe requests

[Marc Blank]

>You're right, there is no server ack (like HTTP 200) in Jabber
anywhere.
>It's definitely something we could add to JEP 22, but I don't like how
>many packets it would add, servers are not currently set up to do this
>stuff (JEP 22 is just for client to client other than the offline stuff
>but I don't know if that is supported), and this would be something
that
>you might want to negotiate for an entire session (or do you want to do
>this on a per-message basis?).

>Just a few questions. :)

>Peter

Hi, Peter.

Yes, I would want it to be per-message (the requesting client wouldn't
want to generate more traffic than necessary either)!  In that way, a
client to ensure that a high-priority message was received.

- Marc