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PortMonitor
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.. py:function:: PortMonitor.__init__ (host="127.0.0.1",freq=10.0, ports=[80,22])
    Create a port monitor for a specified host with a specified list of ports to scan and a specified frequency to check
.. py:function:: PortMonitor.check()
    Run a check for the monitor once
.. py:function:: PortMonitor.start()
    Async run a check for the monitor every freq seconds