I'm not a big POE expert, but my quick read of the documentation suggests this:

  POE::Session->create(
    inline_states => {
      _start => sub {
        $_[KERNEL]->alarm( my_method => time() + 5, 0 );
      },
      my_method => sub {
        $self->method();
        $_[KERNEL]->alarm( my_method => time() + 5, $_[ARG0] + 1 );
      },
    }
  );
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This would call $self->method() every five seconds ($self has to be in scope when you create the POE::Session). If this isn't what you meant, then maybe I don't understand your requirements.