If a value of Host URI is removed, regardless if it contains the default value (tcp://127.0.0.1:1883) or some other, then
<mqtt:host xsi:nil="true"/>
is written to the switchyard.xml. Such a configuration is not valid and cannot be deployed on the runtime. Another thing is that Host URI should not be market with an asterisk because it is optional; Camel sets tcp://127.0.0.1:1883 as a default value internally.
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