This command gives the ability to update an existing subscription without removing its components.
1) To add a new subscription of an existing abstract, add its definition according to hub.cloud.subscription.create rules. It should add a new item in an existing device of an ‘abstract’ category with the schema defined.
2) To modify the existing item’s structure, do the same, but change the item’s schema. It should modify an existing item without changing its identifier.
3) To remove a capability/variable, just add fields and WITHOUT all other fields.