How to use the node-opcua-service-discovery.FindServersOnNetworkRequest function in node-opcua-service-discovery

console.log("note: OPCUAClientBase#getEndpointsRequest is deprecated, use OPCUAClientBase#getEndpoints instead");
    return this.getEndpoints(options,callback);
};

/**
 *
 * send a FindServers request to a discovery server
 * @method findServers
 * @async
 * @param callback [Function}
 */

const discovery_service = require("node-opcua-service-discovery");
const FindServersRequest = discovery_service.FindServersRequest;
const FindServersResponse = discovery_service.FindServersResponse;
const FindServersOnNetworkRequest = discovery_service.FindServersOnNetworkRequest;
const FindServersOnNetworkResponse = discovery_service.FindServersOnNetworkResponse;

/**
 * @method findServers
 * @param options
 * @param [options.endpointUrl]
 * @param [options.localeIds] Array
 * @param [options.serverUris] Array
 * @param callback
 */
OPCUAClientBase.prototype.findServers = function (options, callback) {

    const self = this;

    if (!self._secureChannel) {
        setImmediate(function () {

const assert = require("node-opcua-assert").assert;
const path = require("path");
const fs = require("fs");
const url = require("url");

const OPCUABaseServer = require("node-opcua-server").OPCUABaseServer;
const OPCUAServerEndPoint = require("node-opcua-server").OPCUAServerEndPoint;

const StatusCodes = require("node-opcua-status-code").StatusCodes;

const discovery_service = require("node-opcua-service-discovery");
const RegisterServerRequest = discovery_service.RegisterServerRequest;
const RegisterServerResponse = discovery_service.RegisterServerResponse;
const RegisterServer2Request = discovery_service.RegisterServer2Request;
const RegisterServer2Response = discovery_service.RegisterServer2Response;
const FindServersOnNetworkRequest = discovery_service.FindServersOnNetworkRequest;
const FindServersOnNetworkResponse = discovery_service.FindServersOnNetworkResponse;

const endpoints_service = require("node-opcua-service-endpoints");
const ApplicationType = endpoints_service.ApplicationType;

const get_fully_qualified_domain_name = require("node-opcua-hostname").get_fully_qualified_domain_name;

const debugLog = require("node-opcua-debug").make_debugLog(__filename);
const doDebug = false;

const _announcedOnMulticastSubnet = require("node-opcua-service-discovery")._announcedOnMulticastSubnet;
const _stop_announcedOnMulticastSubnet = require("node-opcua-service-discovery")._stop_announcedOnMulticastSubnet;
const _announceServerOnMulticastSubnet = require("node-opcua-service-discovery")._announceServerOnMulticastSubnet;


function constructFilename(p) {