MQTT producer failure

Hi,

I'm still struggling with camel-mqtt producer to get it working. This
is a previous thread:
http://camel.465427.n5.nabble.com/Dispatch-queue-mqtt-client-was-not-executing-error-from-camel-mqtt-producer-tp5753937.html

I made an example which runs a standalone camel route to verify
camel-mqtt works as expected:
https://github.com/igarashitm/camel/tree/mqtt-consumer-producer-failure
https://github.com/igarashitm/camel/commit/24bdf5c7f8bac5763f2485591561773bba4e337f

But it hits an another issue on producer side. A message is never
published to the output topic through the MQTT producer and it repeats
redeliveries without any error/warn message unless the testcase is
shut down.

Am I doing something wrong in the testcase? If not, I'll file a JIRA
with this example.

Thanks,
Tomo