1. Stream data from our IoT client to a DynamoDB table. We will use the AWS IoT rules to stream data directly
into DynamoDB, this is a great and easy way to get data into an extremely fast lookup store for later
processing.
We need to create a DynamoDB table.
Open the DynamoDB dashboard
Let's call this iotddb
Our partition key can just be "SeqNumber" type String
Add a sort key, a requirement for AWS IoT integration
The sort key can be "SeqSort" type String
Keep all other defaults
Lab 8 - Streaming data to DynamoDB
Step 1

2. One of the great things with a NoSQL datastore is that we don't have to define our anything else for our
schema. Once it has finished being created move to step 2.
We are going to create a new rule for DynamoDB.
Open the AWS IoT dashboard
Click Create Resource and pick Create Rule
We can call this rule iotDynamoDB
Our Attribute will be the usual *
Our From will be ddb
Choose the DynamoDB Action
Tablename is iotddb
Hashkey and Rangekey should populate as SeqNumber + SeqSort
The hash value will be ${SeqNumber}
The range value will be ${SeqSort}
Step 2

3. Select your role.
Make sure your role has DynamoDB Permissions!
As with the other labs we'll want to modify our thingtest.js script to use our new topic but to also specify our
Hash and Range keys.
Your thingtest.js should look like the following:
Step 3

4. // Lab 8 - DynamoDB
var awsIot = require('aws-iot-device-sdk');
var device = awsIot.device({
"host": "data.iot.us-west-2.amazonaws.com",
"port": 8883,
"clientId": "1234",
"thingName": "thingtest",
"caPath": "./root-CA.cer",
"certPath": "./certificate.pem.crt",
"keyPath": "./private.pem.key",
"region": "us-west-2"
});
var message = {
val1: "Value 1",
val2: "Value 2",
val3: "Value 3",
message: "Test Message",
SeqNumber: "",
SeqSort: "1"
};
device.on('connect', function() {
console.log('Connected!');
setTimeout(function() {
for(x=0;x<100;x++) {
message.val1 = "Value 1-" + x;
message.val2 = "Value 1-" + x;
message.val3 = "Value 1-" + x;
message.message = "Test Message " + x;
message.SeqNumber = x;
device.publish('ddb', JSON.stringify(message));
console.log("Published message " + x + " Data: " + JSON.stringify(message));
}
}, 2500);
console.log('Sending to DynamoDB ...');
});
You can now run
JavaScript

5. node thingtest.js
You should see 100 messages sent directly to DynamoDB. You can now open the DynamoDB console and
click your items tab on your table to verify your data arrived.
Bash