In this section, you first create a Lambda function that queries a data stream and returns the sketches detected by AWS DeepLens to Alexa. Then, you create a custom Alexa skill to start playing the game.

Creating a custom skill with Lambda

To create your custom skill in Lambda, complete the following steps:

On the Lambda console, create a new function.

The easiest way to create an Alexa skill is to create the function from the existing blueprints or serverless app repository provided by Lambda and overwrite the code with your own.

For Create function, choose Browse serverless app repository.

For Public repositories, search for and choose alexa-skills-kit-color-expert-python.

Under Application settings, enter an application name and TopicNameParameter.

Choose Deploy.

When the application has been deployed, open the Python file.

Download the file onto your computer.

Copy the Python code from the file and replace the sample code in the file in the Function code section.

This function includes the entire game logic, reads data from the data stream, and returns the result to Alexa. Be sure to change the Region from the default (us-east-1) if you’re in a different Region. See the following code:

kinesis = boto3.client(‘kinesis’, region_name=’us-east-1′

Set the Timeout value to 20 seconds.

You now need to give your Lambda function IAM permissions to read data from the data stream.In your Lambda function editor, choose Permissions.

Choose the Role name under the Execution role. You’re directed to the IAM role editor.

In the editor, choose Attach policies.

Enter Kinesis and choose AmazonKinesisFullAccess.

Choose Attach policy.

Creating a custom skill to play the game

To create your second custom skill to start playing the game, complete the following steps:

Log in to the Alexa Developer Console.

Create a new custom Alexa skill.

On the Create a new skill page, for Skill name, enter a skill name

For Choose a model to add to your skill, choose Custom.

For Choose a method to host your skill’s backend resources, choose Provision your own.

Choose Create skill.

On the next page, choose the default template to add your skill.

Choose Continue with template. After about 1–2 minutes, your skill appears on the console.

In the Endpoint section, enter the Amazon Resource Name (ARN) of the Lambda function created for the Alexa skill in the previous step

Download alexa-skill-json-code.txt onto your computer.

Copy the code from the file and paste in the Alexa skill JSON editor to automatically configure intents and sample utterances for the custom skill.

In the Alexa architecture, intents can be thought of as distinct functions that a skill can perform. Intents can take arguments that are known here as slots.

Choose Save Model to apply the changes.

Choose Build Model.

On the Lambda console, open the Lambda function for the Alexa skill you created earlier.

You need to enable the skill by adding a trigger to the Lambda function.

Choose Add trigger.

Choose Alexa Skills Kit.

For Skill ID, enter the ID for the Alexa skill you created.

Choose Add.

Testing the skill

Your Alexa skill is now ready to tell you the drawings detected by AWS DeepLens. To test with an Alexa-enabled device (such as an Amazon Echo), register the device with the same email address you used to sign up for your developer account on the Amazon Developer Portal. You can invoke your skill with the wake word and your invocation name: “Alexa, Play Guess My Drawing with DeepLens.”

The language in your Alexa companion app should match with the language chosen in your developer account. Alexa considers English US and English UK to be separate languages.

Alternatively, the Test page includes a simulator that lets you test your skill without a device. For Skill testing is enabled in, choose Development. You can test your skill with the phrase, “Alexa, Play Guess My Drawing with DeepLens.”

Windows 10 users can download the free Alexa app from the Microsoft Store and interact with it from their PC.

For more information on testing your Alexa skill, see Test Your Skill. For information on viewing the logs, check Amazon CloudWatch logs for AWS Lambda.

The following diagram shows the user interaction flow of our game.