to loop every 30 minutes

Well I can't run your code because I'm on Linux, but looking at the PerlTray online docs, it says

SetTimer(ELAPSE, CALLBACK)

The SetTimer() function starts an asynchronous timer, which invokes th
+e CALLBACK every time ELAPSE milliseconds have expired. Calling SetTi
+mer() with ELAPSE set to 0 stops the timer for this specific CALLBACK
+. If CALLBACK is omitted, it will default to Timer().

The ELAPSE parameter can also be specified in "hh:mm:ss.xxxx" format. 
+Examples are:

  :15       => 15 seconds
  1:30      => 1 hour, 30 minutes
  4:30:15   => 4 hours, 30 minutes, 15 seconds
  2.500     => 2 seconds, 500 milliseconds
[download]

So you need a line of code something like:

 SetTimer ( 1800000, \&ip )  # 1800 seconds x 1000 for millisecs
 #or possibly 
 SetTimer ( 0:30, \&ip);
[download]

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