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I am trying to use Google’s libjingle framework and need to broadcast a query from a client to other signed-in clients.
Is the correct way to do this with the IQ protocol (http://xmpp.org/extensions/xep-0099.html), the presence protocol (http://xmpp.org/rfcs/rfc3921.html) or just by looping through the relevant clients and sending a direct message?
Firstly XEP-0099 is deferred since 2003 (as per the red text at the top), I know no implementations of it, I really don’t think it’s what you are looking for.
Secondly, for
<iq/>stanzas in general, you cannot broadcast them. They are a one-to-one request-and-response mechanism. One request returns exactly one response (or error), and broadcasting would break that rule. To broadcast some information use a<message/>or perhaps even<presence/>. If you need to request information from a series of JIDs,<iq type="get">probably is indeed the way to do it.