How to use the node-opcua-secure-channel.MessageSecurityMode.None function in node-opcua-secure-channel

securityMode: MessageSecurityMode,
      securityPolicy: SecurityPolicy,
      options?: EndpointDescriptionParams
    ) {
        if (!options) {
            options = { hostname: getFullyQualifiedDomainName() };
        }

        options.allowAnonymous = (options.allowAnonymous === undefined) ? true : options.allowAnonymous;

        // istanbul ignore next
        if (securityMode === MessageSecurityMode.None && securityPolicy !== SecurityPolicy.None) {
            throw new Error(" invalid security ");
        }
        // istanbul ignore next
        if (securityMode !== MessageSecurityMode.None && securityPolicy === SecurityPolicy.None) {
            throw new Error(" invalid security ");
        }
        //

        const port = this.port;

        // resource Path is a string added at the end of the url such as "/UA/Server"
        const resourcePath = (options.resourcePath || "").replace(/\\/g, "/");

        assert(resourcePath.length === 0 || resourcePath.charAt(0) === "/");

        const hostname = options.hostname || getFullyQualifiedDomainName();
        const endpointUrl = `opc.tcp://${hostname}:${port}${resourcePath}`;

        const endpoint_desc = this.getEndpointDescription(securityMode, securityPolicy, endpointUrl);

securityMode: MessageSecurityMode,
      securityPolicy: SecurityPolicy,
      options?: EndpointDescriptionParams
    ) {
        if (!options) {
            options = { hostname: getFullyQualifiedDomainName() };
        }

        options.allowAnonymous = (options.allowAnonymous === undefined) ? true : options.allowAnonymous;

        // istanbul ignore next
        if (securityMode === MessageSecurityMode.None && securityPolicy !== SecurityPolicy.None) {
            throw new Error(" invalid security ");
        }
        // istanbul ignore next
        if (securityMode !== MessageSecurityMode.None && securityPolicy === SecurityPolicy.None) {
            throw new Error(" invalid security ");
        }
        //

        const port = this.port;

        // resource Path is a string added at the end of the url such as "/UA/Server"
        const resourcePath = (options.resourcePath || "").replace(/\\/g, "/");

        assert(resourcePath.length === 0 || resourcePath.charAt(0) === "/", "resourcePath should start with /");

        const hostname = options.hostname || getFullyQualifiedDomainName();
        const endpointUrl = `opc.tcp://${hostname}:${port}${resourcePath}`;

        const endpoint_desc = this.getEndpointDescription(securityMode, securityPolicy, endpointUrl);

public addEndpointDescription(
      securityMode: MessageSecurityMode,
      securityPolicy: SecurityPolicy,
      options?: EndpointDescriptionParams
    ) {
        if (!options) {
            options = { hostname: getFullyQualifiedDomainName() };
        }

        options.allowAnonymous = (options.allowAnonymous === undefined) ? true : options.allowAnonymous;

        // istanbul ignore next
        if (securityMode === MessageSecurityMode.None && securityPolicy !== SecurityPolicy.None) {
            throw new Error(" invalid security ");
        }
        // istanbul ignore next
        if (securityMode !== MessageSecurityMode.None && securityPolicy === SecurityPolicy.None) {
            throw new Error(" invalid security ");
        }
        //

        const port = this.port;

        // resource Path is a string added at the end of the url such as "/UA/Server"
        const resourcePath = (options.resourcePath || "").replace(/\\/g, "/");

        assert(resourcePath.length === 0 || resourcePath.charAt(0) === "/", "resourcePath should start with /");

        const hostname = options.hostname || getFullyQualifiedDomainName();

public addEndpointDescription(
      securityMode: MessageSecurityMode,
      securityPolicy: SecurityPolicy,
      options?: EndpointDescriptionParams
    ) {
        if (!options) {
            options = { hostname: getFullyQualifiedDomainName() };
        }

        options.allowAnonymous = (options.allowAnonymous === undefined) ? true : options.allowAnonymous;

        // istanbul ignore next
        if (securityMode === MessageSecurityMode.None && securityPolicy !== SecurityPolicy.None) {
            throw new Error(" invalid security ");
        }
        // istanbul ignore next
        if (securityMode !== MessageSecurityMode.None && securityPolicy === SecurityPolicy.None) {
            throw new Error(" invalid security ");
        }
        //

        const port = this.port;

        // resource Path is a string added at the end of the url such as "/UA/Server"
        const resourcePath = (options.resourcePath || "").replace(/\\/g, "/");

        assert(resourcePath.length === 0 || resourcePath.charAt(0) === "/");

        const hostname = options.hostname || getFullyQualifiedDomainName();

securityMode: MessageSecurityMode,
  securityPolicy: SecurityPolicy,
  endpointUrl: string | undefined,
  endpoint: EndpointDescription
): boolean {

    assert(endpoint instanceof EndpointDescription);
    const endpoint_securityPolicy = fromURI(endpoint.securityPolicyUri);
    if (endpointUrl && endpoint.endpointUrl! !== endpointUrl) {
        return false;
    }
    return (endpoint.securityMode === securityMode && endpoint_securityPolicy === securityPolicy);
}

const defaultSecurityModes = [
    MessageSecurityMode.None,
    MessageSecurityMode.Sign,
    MessageSecurityMode.SignAndEncrypt
];
const defaultSecurityPolicies = [
    SecurityPolicy.Basic128Rsa15,
    SecurityPolicy.Basic256,
// xx UNUSED!!    SecurityPolicy.Basic256Rsa15,
    SecurityPolicy.Basic256Sha256
];

public addRestrictedEndpointDescription(options: EndpointDescriptionParams) {
        options = _.clone(options);
        options.restricted = true;
        return this.addEndpointDescription(MessageSecurityMode.None, SecurityPolicy.None, options);
    }

endpoints = endpoints.filter((e: EndpointDescription) => {
            return e.securityMode === MessageSecurityMode.None;
        });
    }

public addRestrictedEndpointDescription(options: EndpointDescriptionParams) {
        options = _.clone(options);
        options.restricted = true;
        return this.addEndpointDescription(MessageSecurityMode.None, SecurityPolicy.None, options);
    }

let hostnames: string[] = [ defaultHostname ];

        options.alternateHostname =  options.alternateHostname || [];
        if (typeof options.alternateHostname === "string") {
            options.alternateHostname = [ options.alternateHostname];
        }
        hostnames = _.uniq(hostnames.concat(options.alternateHostname as string[]));


        for (const alternateHostname of hostnames ) {

            const optionsE = options as EndpointDescriptionParams;
            optionsE.hostname = alternateHostname;

            if (options.securityModes.indexOf(MessageSecurityMode.None) >= 0) {
                this.addEndpointDescription(MessageSecurityMode.None, SecurityPolicy.None, optionsE);
            } else {
                if (!options.disableDiscovery) {
                    this.addRestrictedEndpointDescription(optionsE);
                }
            }
            for (const securityMode  of  options.securityModes) {
                if (securityMode === MessageSecurityMode.None) {
                    continue;
                }
                for (const securityPolicy of options.securityPolicies) {
                    if (securityPolicy === SecurityPolicy.None) {
                        continue;
                    }
                    this.addEndpointDescription(securityMode, securityPolicy, optionsE);
                }
            }

const defaultHostname = options.hostname || getFullyQualifiedDomainName();

        let hostnames: string[] = [ defaultHostname ];

        options.alternateHostname =  options.alternateHostname || [];
        if (typeof options.alternateHostname === "string") {
            options.alternateHostname = [ options.alternateHostname];
        }
        hostnames = _.uniq(hostnames.concat(options.alternateHostname as string[]));

        for (const alternateHostname of hostnames ) {

            const optionsE = options as EndpointDescriptionParams;
            optionsE.hostname = alternateHostname;

            if (options.securityModes.indexOf(MessageSecurityMode.None) >= 0) {
                this.addEndpointDescription(MessageSecurityMode.None, SecurityPolicy.None, optionsE);
            } else {
                if (!options.disableDiscovery) {
                    this.addRestrictedEndpointDescription(optionsE);
                }
            }
            for (const securityMode  of  options.securityModes) {
                if (securityMode === MessageSecurityMode.None) {
                    continue;
                }
                for (const securityPolicy of options.securityPolicies) {
                    if (securityPolicy === SecurityPolicy.None) {
                        continue;
                    }
                    this.addEndpointDescription(securityMode, securityPolicy, optionsE);
                }