async function getBrowseName(session: ClientSession, nodeId: NodeId): Promise<string> {
    const dataValue = await session.read({
        attributeId: AttributeIds.BrowseName,
        nodeId
    });
    const browseName = dataValue.value.value.name!;
    return browseName;
}

async function _getAllEventTypes(session: ClientSession, baseNodeId: NodeId, tree: any) {

    const browseDesc1 = {
        nodeId: baseNodeId,
        referenceTypeId: resolveNodeId("HasSubtype"),

        browseDirection: BrowseDirection.Forward,
        includeSubtypes: true,
        nodeClassMask: NodeClassMask.ObjectType, // Objects
        resultMask: 63
    };
    const browseResult = await session.browse(browseDesc1);
    // to do continuation points
    for (const reference of  browseResult.references!) {
        const subtree = { nodeId: reference.nodeId.toString() };
        tree[reference.browseName.toString()] = subtree;
        await _getAllEventTypes(session, reference.nodeId, subtree);
    }
}

        async function worker(element: any) {

            const nodeToBrowse = {
                nodeId: element.nodeId,
                referenceTypeId: resolveNodeId("HierarchicalReferences"),

                browseDirection: BrowseDirection.Forward,
                includeSubtypes: true,
                nodeClassMask: 0x1, // Objects
                resultMask: 63
            };

            const browseResult = await session1.browse(nodeToBrowse);

            for (const ref of browseResult.references!) {
                if (isConditionEventType(ref.typeDefinition)) {
                    //
                    const alarm = {
                        parent: element.nodeId,

                        alarmNodeId: ref.nodeId,
                        browseName: ref.browseName,
                        typeDefinition: ref.typeDefinition,
                        typeDefinitionName: conditions[ref.typeDefinition.toString()]
                    };
                    found.push(alarm);

                } else {
                    await worker(ref.nodeId);
                }
            }
        }

 setTimeout(async () => {
     console.log("time out => shutting down ");
     if (!the_subscription) {
         return resolve();
     }
     if (the_subscription) {
         const s = the_subscription;
         the_subscription = null;
         await s.terminate();
         await the_session.close();
         await client.disconnect();
         console.log(" Done ");
         process.exit(0);
     }
 }, timeout);

    async function findAllNodeOfType(
      tree1: any,
      typeNodeId1: NodeId,
      browseName: string) {

        const browseDesc1 = {
            nodeId: typeNodeId1,
            referenceTypeId: resolveNodeId("HasSubtype"),

            browseDirection: BrowseDirection.Forward,
            includeSubtypes: true,
            resultMask: 63

        };
        const browseDesc2 = {
            nodeId: typeNodeId1,
            referenceTypeId: resolveNodeId("HasTypeDefinition"),

            browseDirection: BrowseDirection.Inverse,
            includeSubtypes: true,
            resultMask: 63

        };
        const browseDesc3 = {
            nodeId: typeNodeId1,
            referenceTypeId: resolveNodeId("HasTypeDefinition"),

            browseDirection: BrowseDirection.Forward,
            includeSubtypes: true,
            resultMask: 63

        };

        const nodesToBrowse = [
            browseDesc1,
            browseDesc2,
            browseDesc3
        ];
        const browseResults = await session.browse(nodesToBrowse);

        tree1[browseName] = {};
        browseResults[0].references = browseResults[0].references || [];
        for (const reference of browseResults[0].references) {
            conditionEventTypes[reference.nodeId.toString()] = reference.browseName.toString();
            await findAllNodeOfType(tree1[browseName], reference.nodeId, reference.browseName.toString());
        }
    }

process.on("SIGINT", async () => {

    console.log(" user interruption ...");

    user_interruption_count += 1;
    if (user_interruption_count >= 3) {
        process.exit(1);
    }
    if (the_subscription) {
        console.log(chalk.red.bold(" Received client interruption from user "));
        console.log(chalk.red.bold(" shutting down ..."));
        const subscription = the_subscription;
        the_subscription = null;;
        await subscription.terminate();
        await the_session.close();
        await client.disconnect();
        process.exit(0);
    }
});

async function main() {

    const optionsInitial = {
        endpoint_must_exist: false,
        keepSessionAlive: true,

        connectionStrategy: {
            initialDelay: 2000,
            maxDelay: 10 * 1000,
            maxRetry: 10
        }
    };

    client = OPCUAClient.create(optionsInitial);

    client.on("backoff", (retry: number, delay: number) => {
        console.log(chalk.bgWhite.yellow("backoff  attempt #"), retry, " retrying in ", delay / 1000.0, " seconds");
    });

    console.log(" connecting to ", chalk.cyan.bold(endpointUrl));
    console.log("    strategy", client.connectionStrategy);

    await client.connect(endpointUrl);

    const endpoints = await client.getEndpoints();

    if (argv.debug) {
        fs.writeFileSync("tmp/endpoints.log", JSON.stringify(endpoints, null, " "));
        console.log(treeify.asTree(endpoints, true));
    }

    const table = new Table();

    let serverCertificate: Certificate;

    let i = 0;
    for (const endpoint of endpoints) {
        table.cell("endpoint", endpoint.endpointUrl + "");
        table.cell("Application URI", endpoint.server.applicationUri);
        table.cell("Product URI", endpoint.server.productUri);
        table.cell("Application Name", endpoint.server.applicationName.text);
        table.cell("Security Mode", endpoint.securityMode.toString());
        table.cell("securityPolicyUri", endpoint.securityPolicyUri);
        table.cell("Type", ApplicationType[endpoint.server.applicationType]);
        table.cell("certificate", "..." /*endpoint.serverCertificate*/);
        endpoint.server.discoveryUrls = endpoint.server.discoveryUrls || [];
        table.cell("discoveryUrls", endpoint.server.discoveryUrls.join(" - "));

        serverCertificate = endpoint.serverCertificate;

        const certificate_filename = path.join(__dirname, "../certificates/PKI/server_certificate" + i + ".pem");

        if (serverCertificate) {
            fs.writeFile(certificate_filename, toPem(serverCertificate, "CERTIFICATE"), () => {/**/
            });
        }
        table.newRow();
        i++;
    }
    console.log(table.toString());

    for (const endpoint of endpoints) {
        console.log("Identify Token for : Security Mode=", endpoint.securityMode.toString(), " Policy=", endpoint.securityPolicyUri);
        const table2 = new Table();
        for (const token of endpoint.userIdentityTokens!) {
            table2.cell("policyId", token.policyId);
            table2.cell("tokenType", token.tokenType.toString());
            table2.cell("issuedTokenType", token.issuedTokenType);
            table2.cell("issuerEndpointUrl", token.issuerEndpointUrl);
            table2.cell("securityPolicyUri", token.securityPolicyUri);
            table2.newRow();
        }
        console.log(table2.toString());
    }
    await client.disconnect();

    // reconnect using the correct end point URL now
    console.log(chalk.cyan("Server Certificate :"));
    console.log(chalk.yellow(hexDump(serverCertificate!)));

    const options = {
        securityMode,
        securityPolicy,
        serverCertificate,

        defaultSecureTokenLifetime: 40000,

        endpoint_must_exist: false,

        connectionStrategy: {
            initialDelay: 2000,
            maxDelay: 10 * 1000,
            maxRetry: 10
        }
    };
    console.log("Options = ", options.securityMode.toString(), options.securityPolicy.toString());

    client = OPCUAClient.create(options);

    console.log(" reconnecting to ", chalk.cyan.bold(endpointUrl));
//.........这里部分代码省略.........