in reply to Server sends knock-knock, client does something.
Consider looking into snmp. It's for this purpose.
s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e
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In Section
Seekers of Perl Wisdom