AWS CloudFormation
User Guide (Version )

AWS::Greengrass::SubscriptionDefinition

The AWS::Greengrass::SubscriptionDefinition resource represents a subscription definition for AWS IoT Greengrass. Subscription definitions are used to organize your subscription definition versions.

Subscription definitions can reference multiple subscription definition versions. All subscription definition versions must be associated with a subscription definition. Each subscription definition version can contain one or more subscriptions.

Note

When you create a subscription definition, you can optionally include an initial subscription definition version. To associate a subscription definition version later, create an AWS::Greengrass::SubscriptionDefinitionVersion resource and specify the ID of this subscription definition.

After you create the subscription definition version that contains the subscriptions you want to deploy, you must add it to your group version. For more information, see AWS::Greengrass::Group.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{ "Type" : "AWS::Greengrass::SubscriptionDefinition", "Properties" : { "InitialVersion" : SubscriptionDefinitionVersion, "Name" : String } }

YAML

Type: AWS::Greengrass::SubscriptionDefinition Properties: InitialVersion: SubscriptionDefinitionVersion Name: String

Properties

InitialVersion

The subscription definition version to include when the subscription definition is created. A subscription definition version contains a list of subscription property types.

Note

To associate a subscription definition version after the subscription definition is created, create an AWS::Greengrass::SubscriptionDefinitionVersion resource and specify the ID of this subscription definition.

Required: No

Type: SubscriptionDefinitionVersion

Update requires: Replacement

Name

The name of the subscription definition.

Required: Yes

Type: String

Update requires: No interruption

Return Values

Ref

When you pass the logical ID of this resource to the intrinsic Ref function, Ref returns the ID of the subscription definition, such as 1234a5b6-78cd-901e-2fgh-3i45j6k178l9.

For more information about using the Ref function, see Ref.

Fn::GetAtt

The Fn::GetAtt intrinsic function returns a value for a specified attribute of this type. The following are the available attributes and sample return values.

For more information about using the Fn::GetAtt intrinsic function, see Fn::GetAtt.

Arn

The Amazon Resource Name (ARN) of the SubscriptionDefinition, such as arn:aws:greengrass:us-east-1:123456789012:/greengrass/definition/subscriptions/1234a5b6-78cd-901e-2fgh-3i45j6k178l9.

Id

The ID of the SubscriptionDefinition, such as 1234a5b6-78cd-901e-2fgh-3i45j6k178l9.

LatestVersionArn

The ARN of the last SubscriptionDefinitionVersion that was added to the SubscriptionDefinition, such as arn:aws:greengrass:us-east-1:123456789012:/greengrass/definition/subscriptions/1234a5b6-78cd-901e-2fgh-3i45j6k178l9/versions/9876ac30-4bdb-4f9d-95af-b5fdb66be1a2.

Name

The name of the SubscriptionDefinition, such as MySubscriptionDefinition.

Examples

Subscription Definition Snippet

The following snippet defines a subscription definition subscription with an initial version that contains a subscription. In this example, the subscription source is an existing device in the group. The target is a function in the group that was created in another stack and is referenced using the ImportValue function.

For an example of a complete template, see the AWS::Greengrass::Group subscription.

JSON

"TestSubscriptionDefinition": { "Type": "AWS::Greengrass::SubscriptionDefinition", "Properties": { "Name": "DemoTestSubscriptionDefinition", "InitialVersion": { "Subscriptions": [ { "Id": "TestSubscription1", "Source": { "Fn::Join": [ ":", [ "arn:aws:iot", { "Ref": "AWS::Region" }, { "Ref": "AWS::AccountId" }, "thing/TestDevice1" ] ] }, "Subject": "some/topic", "Target": { "Fn::ImportValue": "TestCanaryLambdaVersionArn" } } ] } } }

YAML

TestSubscriptionDefinition: Type: 'AWS::Greengrass::SubscriptionDefinition' Properties: Name: DemoTestSubscriptionDefinition InitialVersion: Subscriptions: - Id: TestSubscription1 Source: !Join - ':' - - 'arn:aws:iot' - !Ref 'AWS::Region' - !Ref 'AWS::AccountId' - thing/TestDevice1 Subject: some/topic Target: !ImportValue TestCanaryLambdaVersionArn

See Also