This is a feature of a lot of open source MQTT brokers (Mosca, Mosquitto). We used Mosquitto for our app (http://www.clementine.io http://www.clementine.io), a

This is a feature of a lot of open source MQTT brokers (Mosca, Mosquitto). We used Mosquitto for our app (http://www.clementine.io http://www.clementine.io), and added dynamic auth for SUBSCRIBE and PUBLISH.