def begin_create_or_update_with_http_info(resource_group_name, resource_name, app, custom_headers:nil)
      begin_create_or_update_async(resource_group_name, resource_name, app, custom_headers:custom_headers).value!
    end
def begin_create_or_update_with_http_info(resource_group_name, resource_name, app, custom_headers:nil)
      begin_create_or_update_async(resource_group_name, resource_name, app, custom_headers:custom_headers).value!
    end
Create or update the metadata of an IoT Central application. The usual
 pattern to modify a property is to retrieve the IoT Central application
 metadata and security metadata, and then combine them with the modified
 values in a new body to update the IoT Central application.

 @param resource_group_name [String] The name of the resource group that
 contains the IoT Central application.
 @param resource_name [String] The ARM resource name of the IoT Central
 application.
 @param app [App] The IoT Central application metadata and security metadata.
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.

 @return [MsRestAzure::AzureOperationResponse] HTTP response information.