Syntax Properties Return values Examples See also

AWS::Greengrass::SubscriptionDefinition

The AWS::Greengrass::SubscriptionDefinition resource represents a subscription definition for Amazon 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 Amazon CloudFormation template, use the following syntax:

JSON


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

YAML


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

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

Tags

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


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

Required: No

Type: Array of Tag

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