Currently there are some cases that are not handled well.
For example
CONFIG
with no parameters results in an error SYNTAX: JVMRoute can't be empty
CONFIG
with a single parameter jvmroute=
results in an error SYNTAX: Can't parse MCMP message. It might have contained illegal symbols or unknown elements.
That doesn't look very intuitive.
(Note: version 1.3.x handled both cases with the later message.)