AWS IAM is integrated between AWS IoT and AWS Lambda. AWS IAM, which stands for ‘Amazon Identity and Access Management,’ enables me to securely control access to resources and services. In this case, I have granted AWS Lambda permission to access AWS IoT.

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In AWS Lambda, there is a Node.js code that allows data generated by the temperature sensor kit to be readable by Alexa, which will be used by a voice-controlled device like the Echo Dot. Users are able to ask for the current temperature at a specific venue.

Below is an example of part of the code deployed using AWS Lambda. The AWS SDK is required in the program. The AWS SDK is a library that allows the program to recognize AWS commands. For example, AWS.config.region is used to declare the AWS IoT region, which in this case is us-east-1, and the endpoint is the AWS IoT endpoint generated by the AWS IoT topic.

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  var AWS = require('aws-sdk'); AWS.config.region = config.IOT_BROKER_REGION; // Initializing client for IoT

  var iotData = new AWS.IotData({endpoint: config.IOT_BROKER_ENDPOINT});

 

There are three types of requests required in this case: LaunchRequest, IntentRequest, and SessionEndedRequest. LaunchRequest is where the Echo Dot greets the user: "Welcome to Singapore Polytechnic Graduates Guild, what can I help you with?" IntentRequest is a request made by the Alexa Skills Kit.

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  if (event.request.type === "LaunchRequest") {

     onLaunch(event.request,

     event.session,

     function callback(sessionAttributes, speechletResponse)  {

                context.succeed(buildResponse(sessionAttributes, speechletResponse));

      });

  }  else if (event.request.type === "IntentRequest") {

           onIntent(event.request, event.session,

           function callback(sessionAttributes, speechletResponse) {

                 context.succeed(buildResponse(sessionAttributes, speechletResponse)); });

  } else if (event.request.type === "SessionEndedRequest") {

            onSessionEnded(event.request, event.session);

             context.succeed();

  }

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