Two things occur to me:
  1. You might be suffering from buffering - did you try to do select CLIENT; $|=1;?
  2. I always feel nervous writing to pipes with print - my C background insists that one should write to pipes with the closest-to-the-metal functions available, so I always used syswrite, as in: 
    $msg="+OK\n"; syswrite(CLIENT,$msg);

    [download]
    In addition, syswrite will return the number of bytes actually written, which should help you with your debugging.

In reply to Re: `print CLIENT` seems to send nothing with `use Socket` by matija
in thread `print CLIENT` seems to send nothing with `use Socket` by muba

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