> The impossibility of "exactly once" is a theorem, not an opinion. It's quite likely that your definition of what "exactly once" means differs from the one fo

> The impossibility of "exactly once" is a theorem, not an opinion. It's quite likely that your definition of what "exactly once" means differs from the one followed by MQTT. As this issue was documented years ago, I doubt this is a relevant argument to have, unless we want to feel smart by criticising others. https://www.eejournal.com/2015/05/28/is-exactly-once-delivery-possible-with-mqtt/ https://www.eejournal.com/2015/05/28/is-exactly-once-deliver...