iot-lambda.js

var AWS = require('aws-sdk');

exports.handler = (event, context, callback) => {

    var iotdata = new AWS.IotData({endpoint: 'ASDFASDF.iot.us-west-2.amazonaws.com'});
    var params = {
        topic: 'esp8266_RANDOMID/hellofromamzn',
        payload: 'This is from Lambda',
        qos: 0
    };


    iotdata.publish(params, function(err, data) {
        if (err) console.log(err, err.stack); // an error occurred
        else{
            console.log("message sent");           // successful response
            context.succeed();  // Echo back the first key value
        }     
    });
    
    
};