'fail jenkins ssh script in case a port is unreachable

I am trying to make a final check on my jenkins script, in case a port is available I want the script (build) to be a success, and in case its not available to mark it as failure. How can I achieve this easily?

this is the final check

$ nc -zv 10.10.10.24 3306
Connection to localhost 3306 port [tcp/mysql] succeeded!
bashjenkinsssh


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