AWS::Greengrass::SubscriptionDefinition - AWS CloudFormation


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.


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.


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


{ "Type" : "AWS::Greengrass::SubscriptionDefinition", "Properties" : { "InitialVersion" : SubscriptionDefinitionVersion, "Name" : String, "Tags" : [ Tag, ... ] } }


Type: AWS::Greengrass::SubscriptionDefinition Properties: InitialVersion: SubscriptionDefinitionVersion Name: String Tags: - Tag



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


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


The name of the subscription definition.

Required: Yes

Type: String

Update requires: No interruption


Application-specific metadata to attach to the subscription definition. You can use tags in IAM policies to control access to AWS IoT Greengrass resources. You can also use tags to categorize your resources. For more information, see Tagging Your AWS IoT Greengrass Resources in the AWS IoT Greengrass Version 1 Developer Guide .

This Json property type is processed as a map of key-value pairs. It uses the following format, which is different from most Tags implementations in AWS CloudFormation templates.

"Tags": { "KeyName0": "value", "KeyName1": "value", "KeyName2": "value" }

Required: No

Type: Array of Tag

Update requires: No interruption

Return values


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.


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.


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.


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


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.


The name of the SubscriptionDefinition, such as MySubscriptionDefinition.


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.


"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" } } ] } } }


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