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.
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But as I understand it, before a client can listen to messages, he should have a gmail account. That’s very impractical.
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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.