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Description
Problem or use case
It appears the intention of MqttUtf8String.toString() is to return the decoded String (see also implementation). However, this is currently not documented; toString() is not overridden and its documentation is not adjusted. It is therefore not obvious how a user can easily get a String from a MqttUtf8String.
Preferred solution or suggestions
If MqttUtf8String.toString() is guaranteed to return the decoded String, then MqttUtf8String should override toString() and add a Javadoc comment to it describing its behavior.