AWS 使用 websocket 将数据从 dynamo DB 发送到客户端

Question

Hi i am new to AWS and IOT in general , is there a way to let AWS console send data stored in Dynamo DB on update to client side using web-socket ?

ESP32-->DynamoDB ----OnUpdate()--->send json to client using web-socket

Answer 1

You'll likely need to use a combination of AWS products to do this, but yes, it's possible. Here's how you might set it up to work in a pretty serverless way, that scales to whatever traffic you want at a linear cost per operation:

• ESP32 -> DynamoDB - You're doing a PutItem or UpdateItem operation here, note that and make sure there's a way to filter the operations you want to send updates for.

• Activate DynamoDB Streams - this is a system that will do something you want for each change in the DynamoDB table. You'll have the option of choosing which data to include in the stream events, depending on what you need access to, you can make a choice.

• Set up a Lambda function in whatever language you want and configure it to be called in response to the stream . This gives you a fast and consistent way to process each event on the stream. Write your logic in the Lambda to check whether this update needs to be broadcast or not, and which topic it should be sent under.

• Set up IoT Core for access from the browser, probably using MQTT over Websockets, and send the message into the topic you want from the Lambda.

This should do what you want.