It’s fully open source see the github links above
I would say I’ve done some initial early work on this linked by Glyn above, learning about the mosquitto auth plugin and access lists and putting together a basic MQTT broker example, looks possible in principle. Early days, perhaps a topic for another thread… Are you building the same thing @pb66 or where you referring more to the requirements from emonhub’s perspective?
Excellent 
Up to 46x speed improvement compared to where we were this time yesterday. Not often you find those sorts of gains!
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