I've been looking for a way to tell clients about expired objects and AppEngine's XMPP implementation seems really interesting because it's scalable, should be reliable and can contain up to 100kb of data.
But as I understand it, before a client can listen to messages, he should have a gmail account. That's very impractical.
Is there maybe a way to make temporary readonly XMPP accounts to use with this?
Unless you are talking about the need for a GMAIL account to create an AppEngine robot... in which case YES you need to have a Google account.
In that situation, I would perform ajax calls every 5 minutes in example to check it.
It's easy to implement and the data exchanged can be reduced to the max (taking advantage of "fast query/response" bonifications of google-app).
Regards.
jldupont has it right for the first point : any JID should work :)
For the 2nd point, the only option is probably to set up your own server and allow anonymous access + temporary accounts.
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