OK, you want XMPP. But without the many XEPs, something with a monolithic specification. And you like to use the latest trendy hipster stuff, like JSON over HTTP instead of XML. Then you get:

Monolithic, Awefully Trendy Re-Implementation of XMPP (M.A.T.R.I.X.)

Which is also a dedication to XMPP, which has been invented in 1999, the year of the Matrix film.