How to use the openpyn.systemd function in openpyn

for port_number in internally_allowed:
                open_ports += " " + port_number
            openpyn_options += " --allow" + open_ports
        if skip_dns_patch:
            openpyn_options += " --skip-dns-patch"
        if nvram:
            openpyn_options += " --nvram " + str(nvram)
        if openvpn_options:
            openpyn_options += " --openvpn-options '" + openvpn_options + "'"
        # logger.debug(openpyn_options)
        if subprocess.check_output(["/bin/uname", "-o"]).decode(sys.stdout.encoding).strip() == "ASUSWRT-Merlin":
            initd.update_service(openpyn_options, run=True)
        elif os.path.exists("/etc/openwrt_release"):
            initd.update_service(openpyn_options, run=True)
        else:
            systemd.update_service(openpyn_options, run=True)
        return 0

    elif kill:
        logger.warning("Killing the running processes")
        kill_management_client()
        kill_vpn_processes()  # don't touch iptable rules
        kill_openpyn_process()

    elif kill_flush:
        firewall.clear_fw_rules()      # also clear iptable rules
        # if --allow present, allow those ports internally
        logger.info("Re-enabling ipv6")
        firewall.manage_ipv6(disable=False)
        if internally_allowed:
            network_interfaces = get_network_interfaces()
            firewall.internally_allow_ports(network_interfaces, internally_allowed)

def initialise(log_folder: str) -> bool:
    credentials.save_credentials()
    update_config_files()
    if not os.path.exists(log_folder):
        os.mkdir(log_folder)
        os.chmod(log_folder, mode=0o777)
        open(log_folder + "/openpyn.log", "a").close()      # touch the log file
        os.chmod(log_folder + "/openpyn.log", mode=0o777)
    if sys.platform == "linux":
        if subprocess.check_output(["/bin/uname", "-o"]).decode(sys.stdout.encoding).strip() == "ASUSWRT-Merlin":
            return initd.install_service()
        elif os.path.exists("/etc/openwrt_release"):
            return initd.install_service()
        elif subprocess.check_output(["cat", "/proc/1/comm"]).decode(sys.stdout.encoding).strip() == "systemd":
            return systemd.install_service()
        logger.warning("systemd not found, skipping systemd integration")
        return 1