Had a question about Google's support for XMPP. I want to build a mobile chat client on top of google chat that can interoperate with google chat run from within Gmail or any other service. Would this application be possible to build since has announced that it will drop support for XMPP for their new Hangouts product? Are there any alternative techniques to allow interoperable chat with Google accounts?
Actually, they removed server to server (s2s) federation. Third-party software works as client to server (c2s) is still enabled, even if we don't know for how long.
As Google says
Note: We announced a new communications product, Hangouts, in May 2013. Hangouts will > replace Google Talk and does not support XMPP. The information in this Developer's > Guide pertains only to Google Talk.
More info: