Get Thing Shadow of Aws iot thing in lambda function - node.js

Question

I was trying to get the thing shadow of a resource of aws iot in lambda function but the given code is giving null value on success instead of a data. Please let me know where is the problem and what changes should i do to make it work fine. Thanks in advance.
var AWS=require('aws-sdk');
var iotdata = new AWS.IotData({endpoint: 'XXXXXXXXX.iot.us-east-1.amazonaws.com'});
var params = {
thingName: 'thing_name' /* required */
};
exports.handler=function(event,context){
payload1=new Buffer(event.payload);
console.log(payload1);
iotdata.getThingShadow(params, function(err, data) {
if (err) console.log(err, err.stack); // an error occurred
else console.log(data); // successful response
context.succeed(data);
});
};

Answer 1

There are few places which need to be changed. Here is the new code:
getIotShadow: function (thingName) {
config.IOT_BROKER_ENDPOINT = "xxxxxxxxx.iot.us-east-1.amazonaws.com"; // also called the REST API endpoint
config.IOT_BROKER_REGION = "us-east-1"; // eu-west-1 corresponds to the Ireland Region. Use us-east-1 for the N. Virginia region
config.IOT_THING_NAME = thingName;
AWS.config.region = config.IOT_BROKER_REGION;
var iotData = new AWS.IotData({
endpoint: config.IOT_BROKER_ENDPOINT
});
var paramsGet = {
"thingName": config.IOT_THING_NAME /* required */
};
iotData.getThingShadow(paramsGet, function (err, data) {
if (err) {
console.log("Error : " + err, err.stack);
} else {
console.log(JSON.stringify(data));
}
});
}