MQTT higher QoS on subscriber
问题 If I have a publisher sending a message to my MQTT broker with QoS 1 (at least once delivery) and a subscriber with QoS 2 (exactly once delivery), is it possible for the subscriber to still receive duplicate messages? My concern is that the publisher could send duplicate messages to the broker (since QoS 1 states that is possible) and then the broker would view them all as different messages and forward all of them on to the subscriber. Is this how MQTT brokers work? Or are they smart enough