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Logout from the connected fritz.box in order to free up any resources. You 
can still use any other method on this object, in which case it is 
logs in again (which eats up some performance, of course)

=cut

sub logout {
    my $self = shift;
    return unless $self->{sid};

    # Send a post request as defined in 
    # http://www.avm.de/de/Extern/files/session_id/AVM_Technical_Note_-_Session_ID.pdf
    my $req = HTTP::Request->new(POST => $self->{login_url});
    $req->content_type("application/x-www-form-urlencoded");
    my $login = "sid=".$self->{sid}."&security:command/logout=fcn";
    $req->content($login);
    my $resp = $self->{ua}->request($req);
    die "Cannot logout SID ",$self->{sid},": ",$resp->status_line unless $resp->is_success;
    print "--- Logout ",$self->{sid} if $DEBUG;
    delete $self->{sid};
}