# AWS IoT
> IoT (Internet Of Things) services for industrial, consumer, and commercial solutions
* AWS IoT provides broad and deep functionality, spanning the edge to the cloud, so you can build IoT solutions for virtually any use case across a wide range of devices
* Since AWS IoT integrates with **AI services**, you can make devices smarter, even without Internet connectivity
* AWS IoT can easily scale as your device fleet grows and your business requirements evolve
* AWS IoT also offers the most comprehensive security features so you can create **preventative security policies** and **respond immediately to potential security issues**
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### What AWS IoT offers
> AWS IoT provides device software, control services, and data services
* **Device software**
: enables you to securely connect devices, gather data, and take intelligent actions locally, even when Internet connectivity is not available.
* **Connectivity & Control**
: services allow you to control, manage, and secure large and diverse device fleets
* **Analytics**
: services help you extract value from IoT data.
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## AWS IoT Services
### 1. Device Software
> Connect your devices & operate them at the edge
#### 1-1. FreeRTOS
* FreeRTOS is an **open source**, **real-time operating system** for `microcontrollers` that makes small, low-power edge devices easy to program, deploy, secure, connect, and manage.
* Distributed freely under the MIT open source license, FreeRTOS includes a kernel and a growing set of software libraries suitable for use across industry sectors and applications
* This includes securely connecting your small, low-power devices to AWS cloud services like AWS IoT Core or to more powerful edge devices running `AWS IoT Greengrass`
* FreeRTOS is built with an emphasis on reliability and ease of use.
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#### 1-2. AWS IoT Greengrass
* AWS IoT Greengrass seamlessly extends AWS to edge devices so they can act locally on the data they generate, while still using the cloud for management, analytics, and durable storage
* With AWS IoT Greengrass, connected devices can run [AWS Lambda](https://aws.amazon.com/lambda/) functions, Docker containers, or both, execute predictions based on machine learning models, keep device data in sync, and communicate with other devices securely – even when not connected to the Internet
* With AWS IoT Greengrass, you can use familiar languages and programming models to create and test your device software in the cloud, and then deploy it to your devices
* AWS IoT Greengrass can be programmed to filter device data, manage the life-cycle of that data on the device, and only transmit necessary information back to AWS
* You can also connect to third-party applications, on-premises software, and AWS services out-of-the-box with AWS IoT Greengrass Connectors
* Connectors also jumpstart device onboarding with pre-built protocol adapter integrations and allow you to streamline authentication via integration with [AWS Secrets Manager](https://aws.amazon.com/secrets-manager/).
**How AWS IoT Greengrass works**
* AWS IoT Greengrass Core devices, AWS IoT Device SDK-enabled devices, and FreeRTOS devices can be configured to communicate with one another in an AWS IoT Greengrass group
* If the AWS IoT Greengrass Core device loses connectivity to the cloud, devices in the AWS IoT Greengrass group can continue to communicate with each other over the local network
* An AWS IoT Greengrass group may represent one floor of a building, one truck, or an entire mining site.
* AWS IoT Greengrass provides pre-built connectors so you can easily extend edge device functionality without writing code
* AWS IoT Greengrass Connectors enable you to quickly connect to third-party applications, on-premises software, and AWS services at the edge.
* AWS IoT Greengrass provides hardware root of trust private key storage for edge devices
* You can use AWS IoT Greengrass capabilities alongside hardware-secured message encryption.
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### 2. Connectivity & Control Services
> Secure, control, and manage your devices from the cloud
#### 2-1. AWS IoT Core
* AWS IoT Core lets connected devices easily and securely interact with cloud applications and other devices
* AWS IoT Core can support billions of devices and trillions of messages, and can process and route those messages to AWS endpoints and to other devices reliably and securely
* With AWS IoT Core, your applications can keep track of and communicate with all your devices, all the time, even when they aren't connected
* AWS IoT Core also makes it easy to use AWS and Amazon services like `AWS Lambda`, `Amazon Kinesis`, `Amazon S3`, `Amazon SageMaker`, `Amazon DynamoDB,` `Amazon CloudWatch`, `AWS CloudTrail`, `Amazon QuickSight`, and `Alexa Voice Service` to build IoT applications that gather, process, analyze and act on data generated by connected devices, without having to manage any infrastructure
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#### 2-2. AWS IoT Device Defender
* AWS IoT Device Defender is a **fully managed service** that helps you secure your fleet of IoT devices
* AWS IoT Device Defender **continuously audits your IoT configurations** to make sure that they aren't deviating from security best practices
* AWS IoT Device Defender also lets you continuously **monitor security metrics** from devices and AWS IoT Core for deviations from what you have defined as appropriate behavior for each device
* AWS IoT Device Defender can **send alerts** to the AWS IoT Console, Amazon CloudWatch, and Amazon SNS
* If you determine that you need to take an action based on an alert, you can use [AWS IoT Device Management](https://aws.amazon.com/iot-device-management/) to take mitigating actions such as pushing security fixes
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#### 2-3. AWS IoT Device Management
* AWS IoT Device Management makes it easy to securely register, organize, monitor, and remotely manage IoT devices at scale
* With AWS IoT Device Management, you can register your connected devices individually or in bulk, and easily manage permissions so that devices remain secure
* You can also organize your devices, monitor and troubleshoot device functionality, query the state of any IoT device in your fleet, and send firmware updates `over-the-air (OTA)`
* AWS IoT Device Management is agnostic to device type and OS, so you can manage devices from constrained microcontrollers to connected cars all with the same service
* AWS IoT Device Management allows you to **scale your fleets** and **reduce the cost and effort** of managing large and diverse IoT device deployments.
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### 3. Analytics Services
> Work with IoT data faster to extract value from your IoT data
#### 3-1. AWS IoT Analytics
: AWS IoT Analytics makes it easy to run sophisticated analytics on massive volumes of IoT data.
#### 3-2. AWS IoT SiteWise
: AWS IoT SiteWise makes it easy to collect, organize and analyze industrial data at scale.
#### 3-3. AWS IoT Events
: AWS IoT Events makes it easy to detect and respond to events from large numbers of IoT sensors and applications.
#### 3-4. AWS IoT Things Graph
: AWS IoT Things Graph makes it easy to connect different devices and cloud services to build IoT applications.
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#### Summary
1. AWS IoT provides broad and deep functionality, spanning the edge to the cloud, so you can build IoT solutions for virtually any use case across a wide range of devices
2. AWS IoT provides device software, control services, and data services
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