huber-and commented on PR #29421:
URL: https://github.com/apache/camel/pull/29421#issuecomment-6724362717

   Thanks a lot @davsclaus and @etzel-mes for the thorough reviews. Serdar, 
seeing each point reproduced against EMQX helped a lot.
   
   All points are addressed in the last two commits, the additional ones from 
gnodet-bot included, mostly as suggested. Where Serdar proposed a different 
route I followed it: a Vert.x worker of one thread for the consumer, 
pause/drain/disconnect on stop with `ShutdownAware`, an unconditional 
`disconnect()` on stop, and the paho5 rules for failed manual acks (redeliver 
only for QoS 1 with a kept session, acknowledge otherwise).
   
   A few things worth noting:
   
   - Every fix has a test, and each test fails without its fix. The exception 
is the publish reordering under MQTT 5: the whole publish now runs on the 
connection's context, but I could not reproduce the reordering with the 
in-process test broker (no topic aliases), so there is no test for it. Serdar, 
a run against EMQX would confirm it.
   - Incoming and outgoing headers are separate now: the producer reads 
`CamelVertxMqttOverrideQos` and `CamelVertxMqttOverrideRetained`.
   - `CamelVertxMqttUserProperties` is a list of entries now, keeping order and 
repeated keys.
   - The release of waiting exchanges after a reconnect, the keep alive 
behaviour, QoS 2 across a reconnect and the tech preview status are documented 
rather than changed.
   
   On the vertx-mqtt side I'll open issues for the PUBREL handling after a 
reconnect, for the in-flight state a client keeps across a lost connection, and 
for the keep alive gap that vert-x3/vertx-mqtt#123 left open (no PINGREQ while 
the client keeps writing).
   


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