AWS IoT Construct Library

The APIs of higher level constructs in this module are experimental and under active development. They are subject to non-backward compatible changes or removal in any future version. These are not subject to the Semantic Versioning model and breaking changes will be announced in the release notes. This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

AWS IoT Core lets you connect billions of IoT devices and route trillions of messages to AWS services without managing infrastructure.

TopicRule

Create a topic rule that give your devices the ability to interact with AWS services. You can create a topic rule with an action that invoke the Lambda action as following:

const func = new lambda.Function(this, 'MyFunction', {
  runtime: lambda.Runtime.NODEJS_LATEST,
  handler: 'index.handler',
  code: lambda.Code.fromInline(`
    exports.handler = (event) => {
      console.log("It is test for lambda action of AWS IoT Rule.", event);
    };`
  ),
});

new iot.TopicRule(this, 'TopicRule', {
  topicRuleName: 'MyTopicRule', // optional
  description: 'invokes the lambda function', // optional
  sql: iot.IotSql.fromStringAsVer20160323("SELECT topic(2) as device_id, timestamp() as timestamp FROM 'device/+/data'"),
  actions: [new actions.LambdaFunctionAction(func)],
});

Or, you can add an action after constructing the TopicRule instance as following:

declare const func: lambda.Function;

const topicRule = new iot.TopicRule(this, 'TopicRule', {
  sql: iot.IotSql.fromStringAsVer20160323("SELECT topic(2) as device_id, timestamp() as timestamp FROM 'device/+/data'"),
});
topicRule.addAction(new actions.LambdaFunctionAction(func));

You can also supply errorAction as following, and the IoT Rule will trigger it if a rule's action is unable to perform:

import * as logs from 'aws-cdk-lib/aws-logs';

const logGroup = new logs.LogGroup(this, 'MyLogGroup');

new iot.TopicRule(this, 'TopicRule', {
  sql: iot.IotSql.fromStringAsVer20160323("SELECT topic(2) as device_id, timestamp() as timestamp FROM 'device/+/data'"),
  errorAction: new actions.CloudWatchLogsAction(logGroup),
});

If you wanna make the topic rule disable, add property enabled: false as following:

new iot.TopicRule(this, 'TopicRule', {
  sql: iot.IotSql.fromStringAsVer20160323("SELECT topic(2) as device_id, timestamp() as timestamp FROM 'device/+/data'"),
  enabled: false,
});

See also @aws-cdk/aws-iot-actions-alpha for other actions.

Logging

AWS IoT provides a logging feature that allows you to monitor and log AWS IoT activity.

You can enable IoT logging with the following code:

new iot.Logging(this, 'Logging', {
  logLevel: iot.LogLevel.INFO,
});

Note: All logs are forwarded to the AWSIotLogsV2 log group in CloudWatch.

Audit

An AWS IoT Device Defender audit looks at account- and device-related settings and policies to ensure security measures are in place. An audit can help you detect any drifts from security best practices or access policies.

Account Audit Configuration

The IoT audit includes various audit checks, and it is necessary to configure settings to enable those checks.

You can enable an account audit configuration with the following code:

// Audit notification are sent to the SNS topic
declare const targetTopic: sns.ITopic;

new iot.AccountAuditConfiguration(this, 'AuditConfiguration', {
  targetTopic,
});

By default, all audit checks are enabled, but it is also possible to enable only specific audit checks.

new iot.AccountAuditConfiguration(this, 'AuditConfiguration', {
  checkConfiguration: {
    // enabled
    authenticatedCognitoRoleOverlyPermissiveCheck: true,
    // enabled by default
    caCertificateExpiringCheck: undefined,
    // disabled
    caCertificateKeyQualityCheck: false,
    conflictingClientIdsCheck: false,
    deviceCertificateExpiringCheck: false,
    deviceCertificateKeyQualityCheck: false,
    deviceCertificateSharedCheck: false,
    intermediateCaRevokedForActiveDeviceCertificatesCheck: false,
    ioTPolicyPotentialMisConfigurationCheck: false,
    iotPolicyOverlyPermissiveCheck: false,
    iotRoleAliasAllowsAccessToUnusedServicesCheck: false,
    iotRoleAliasOverlyPermissiveCheck: false,
    loggingDisabledCheck: false,
    revokedCaCertificateStillActiveCheck: false,
    revokedDeviceCertificateStillActiveCheck: false,
    unauthenticatedCognitoRoleOverlyPermissiveCheck: false,
  },
});

Scheduled Audit

You can create a scheduled audit that is run at a specified time interval. Checks must be enabled for your account by creating AccountAuditConfiguration.

declare const config: iot.AccountAuditConfiguration;

// Daily audit
const dailyAudit = new iot.ScheduledAudit(this, 'DailyAudit', {
  accountAuditConfiguration: config,
  frequency: iot.Frequency.DAILY,
  auditChecks: [
    iot.AuditCheck.AUTHENTICATED_COGNITO_ROLE_OVERLY_PERMISSIVE_CHECK,
  ],
})

// Weekly audit
const weeklyAudit = new iot.ScheduledAudit(this, 'WeeklyAudit', {
  accountAuditConfiguration: config,
  frequency: iot.Frequency.WEEKLY,
  dayOfWeek: iot.DayOfWeek.SUNDAY,
  auditChecks: [
    iot.AuditCheck.CA_CERTIFICATE_EXPIRING_CHECK,
  ],
});

// Monthly audit
const monthlyAudit = new iot.ScheduledAudit(this, 'MonthlyAudit', {
  accountAuditConfiguration: config,
  frequency: iot.Frequency.MONTHLY,
  dayOfMonth: iot.DayOfMonth.of(1),
  auditChecks: [
    iot.AuditCheck.CA_CERTIFICATE_KEY_QUALITY_CHECK,
  ],
});