@descartes 10 MQTT connections per application is a lot, I agree with you on that. But 50 MQTT connections per IP is in some cases easily reached. We, for example, have a rather large installation with a lot of different sensors. Each sensor has its own application. A Telegraf client (TICK stack) is used to connect to all of these applications, one MQTT connection per app. It’s the same server, so we are currently at around 40 apps ( = 40 MQTT connections) for this IP.
(…yes, that’s a lot for a free shared community project to handle. We know that. We are deep into switching to v3 (and non community instances), but this takes some time for us))