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How Cloud IOT works

Manikandan Somuramasami

Connect things to the Device GatewayThe AWS IoT Device Gateway enables devices to securely and efficiently communicate with AWS IoT. Click here to learn more about the protocols supported by AWS IoT.Things can communicate with each other via the Device Gateway, even if they are using different protocols.The example at the left illustrates two things -- a connected light bulb, and a control unit -- both connected to the Device Gateway. The control unit can publish commands into the Device Gateway, and the light bulb can subscribe and listen for relevant commands.Try publishing a command from the control unit to see how that command is delivered via the Device Gateway.

Manikandan Somuramasami

Process and act on data with the Rules EngineThe rules engine can also route messages to cloud endpoints such as AWS Lambda functions, or a DynamoDB table. Click here to learn more about the actions you can execute via rules.The example at the left shows the addition of a second rule that:Evaluates commands published by the control unitDetermines whether the command is "R"If the command is "R", the rule delivers copies of the message to 3 endpoints -- a DynamoDB database table, a Lambda compute function, and Simple Notification Service (SNS) for push notifications to a mobile device.Try sending "R" "G" and "B" commands from the control unit to observe how the rules engine processes those messages. Try also enabling and disabling each of the rules.

Manikandan Somuramasami

Read and set device state with ShadowsAWS IoT includes Device Registry and Device Shadows, so you can register any thing you wish to represent in the cloud with a name, some attributes, and a persistent virtual 'shadow'.The example at the left shows that a thing has been created to represent the physical light bulb, with a virtual counterpart in the cloud.Try turning off the physical light bulb. You'll notice that the Device Shadow remembers the color of the physical light bulb.Next, try sending new "R" "G" and "B" commands from the control unit, with the physical light bulb still turned off.The shadow will persist the desired future state of the bulb. When you turn the physical bulb back on, AWS IoT will command the physical bulb to match its shadow.

Manikandan Somuramasami

Read and set device state with ShadowsAWS IoT makes it easy to build companion applications that interact with your connected things.The example at the left shows a mobile application that reflects the color of your light bulb. The mobile app never communicates directly to the light bulb. Rather, the mobile app uses a REST API to read and set the state of the bulb's Device Shadow.Try interacting with the bulb via this mobile app.

Manikandan Somuramasami

Get startedThis interactive tutorial has demonstrated the following features of AWS IoT:Connect things to the Device GatewayProcess and act on data with the Rules EngineRead and set device state with ShadowsYou can now get started by creating a thing of your own.You can learn more by reading the getting started guide or repeating this tutorial.

1. Smartphone Centric Architecture (with or without cloud)

In smartphone-centric architecture a light bulb is connected directly to a smartphone via Bluetooth. Thus the light bulb doesn’t have a direct link to the Internet and depends on the proximity of the smartphone.

2. Hub-centric Architecture (with or without cloud)The Hub in hub-centric architecture is working as an intermediary for connecting a bulb to the smartphone and to the Internet, since it usually connects to the home Wi-Fi or Ethernet network. A smart lightbulb is totally independent of a smartphone and could be smart on it’s own.

3.Cloud Centric Architecture (without hub)

We have a smart device that is directly connected to the home Wi-Fi network and doesn’t need any additional hub to work.

Smart Home Ecosystem Wars: Android Brillo + Weave vs HomeKit

vs Amazon EchoThere is a constant battle of ecosystem platforms designed to organize and connect our home appliances. Such a platform is a necessary and required step before we can invent and build more services on top of the connected smart home devices.

Google and Apple are moving towards the Hub centric architecture with OnHub and Apple TV respectively. They both also have their own infrastructure ecosystems (Brillo + Weave from Google and HomeKit from Apple) that are aiming to keep customers locked within their walled gardens. Such an approach will allow Google and Apple to have full control over your home, know everything about you and your family and provide added services to you for an additional cost. This will be a good scenario with a recurring business model for them.

Amazon is also trying to build the same ecosystem with Amazon Echo and a fleet of third party connected hardware appliance. Eventually the result will be the same locked ecosystem for the consumer in which she can use content and services and buy her household products from Amazon. Another great concept from Amazon, which is currently tested only with its Prime Members, is the Amazon Dash buttons that allow users to buy products with literally one click of a button that is attached to a wall in the kitchen or bathroom.

Amazon released the Lightning API for the Amazon Echo, which lets customers control lights and switches by speaking a command. If you are a smart light bulb developer you can benefit from such integration, which increases interoperability and gives a customer more options when using the device.