public function setUseSSL(string $use_ssl = "F") : CNabuDataObject
    {
        if ($use_ssl === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$use_ssl")
            );
        }
        $this->setValue('nb_cluster_group_service_use_ssl', $use_ssl);
        
        return $this;
    }