Github user mtaylor commented on the issue:
https://github.com/apache/activemq-artemis/pull/1389
@clebertsuconic For QoS1 and QoS2 **every message** must be ack'd. There
is no optimisation like we have in CORE to do batching of acks. This includes
duplicate messages, note: It is possible for clients to have overlapping
subscriptions and receive duplicates:
> "When Clients make subscriptions with Topic Filters that include
wildcards, it is possible for a Clientâs subscriptions to overlap so that a
published message might match multiple filters. In this case the Server MUST
deliver the message to the Client respecting the maximum QoS of all the
matching subscriptions [MQTT-3.3.5-1]. In addition, the Server MAY deliver
further copies of the message, one for each additional matching subscription
and respecting the subscriptionâs QoS in each case. "
>
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