WebSocket - API Gateway

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In this section, we create a WebSocket server using API Gateway's endpoint and lambda as backend to create a persistent medium of low-latency communication between the Alexa skill lambda and GCS

• Create a new lambda function with Node.js 16.x, paste this in index.js of new lambda

• Create a new DynamoDB table SOME_TABLE for storing connection ids of active clients connected to WebSocket

• Add TABLE: SOME_TABLE to environment variables of lambda function

• Create a new WebSocket API in AWS API Gateway, configure it according to below images

👇Images

• Set route selection expression to $request.body.action

• After creating and deploying WebSocket API, navigate to Stages and select a stage, copy the WebSocket URL

• Paste the url as ENDPOINT variable in index.js of WebSocket Lambda, paste it in main.py of GCS and also in wsSend function of Alexa's Lambda

• Deploy the lambda function

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Known issues

None