Get ready, MQTT 5 is coming!
summary
Protocol adds one new packet — AUTH challenge/response — and a uniform properties model so every packet can carry reason codes, diagnostic strings, content type, max packet size and session expiry. Servers can advertise supported features so clients avoid unsupported behavior. 3.1.1 remains usable while v5 adds clearer error reporting and scalable session lifetimes. Public review draft appears in August, next 30‑day review is due soon with a target for publication around Q1 2018, and there is an Eclipse/Paho test broker and conformance suite.
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