public function setPort(int $port = 80) : CNabuDataObject
    {
        if ($port === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$port")
            );
        }
        $this->setValue('nb_server_host_port', $port);
        
        return $this;
    }