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Azure IoT Development Cookbook
Azure IoT Development Cookbook

Azure IoT Development Cookbook: Develop and manage robust IoT solutions

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Azure IoT Development Cookbook

Introducing Device Management

In this chapter, you will learn the following recipes:

  • Device registry operations
  • Device twins
  • Device direct methods
  • Device jobs
  • IoT Hub query explorer

Introduction

Azure IoT Hub has capabilities that can be used by a developer to build robust device management. There could be different use cases or scenarios across multiple industries, but these device management capabilities, their patterns, and the SDK code remains the same, saving significant time in developing and managing, along with maintaining millions of devices.

Device management will be the central part of any IoT solution. The IoT solution helps users to manage devices remotely, take actions from cloud-based applications such as disable, update data, run any command, and firmware updates.

In this chapter, we are going to perform all these tasks for device management, and we will start with creating the device.

Understanding IoT Hub endpoints

...

Device registry operations

This sample application is focused on device registry operations and how they work. We will create a console application as our first IoT solution and look at the various device management techniques.

Getting ready

Let's create a console application to start with IoT:

  1. Create a new project in Visual Studio:
Create a console application
  1. Add the IoT Hub connectivity extension in Visual Studio:
Add the extension for IoT Hub connectivity
  1. Now, right-click on the Solution in Visual Studio, navigate to Add, and select Connected Services.
  2. Select Azure IoT Hub and click on Add.
  3. Now, select the Azure subscription from the dropdown, followed by which you will get a list of the IoT Hub service parts...

Device twins

Firstly, we need to understand what a device twin is. We will be following some steps to use a device twin to understand their purpose and where we can use the device twin in any IoT solution. The device twin is a JSON formatted document that describes the metadata, properties of any device created within IoT Hub. It describes the individual device specific information.

The device twin is made up of: tags, desired properties, and reported properties. The operations that can be done on an IoT device is to update the data or query for any IoT device. this feature can be built into the IoT Solution from where a Administrator user can initiate these.

Tags hold the device metadata that can be accessed from an IoT solution only. The desired properties are set from the IoT solution and can be accessed on the device. Whereas the reported properties are set on the device and...

Device direct methods

Azure IoT Hub provides fully managed bidirectional communication between the IoT solution on the backend and the IoT devices in the fields. We will be considering detailed message communication in Chapter 3, IoT Hub Messaging and Commands.

When there is a need for an immediate communication result, a direct method best suits these scenarios. Let's take an example of a home automation system. One needs to control the AC temperature or turn the faucet showers on/off. It uses the HTTP protocol for method invocation.

How to do it...

The following steps will be taken to perform a direct method with an IoT device connected with IoT Hub:

  1. Invoke this method from the application:
public async Task<CloudToDeviceMethodResult...

Device jobs

In a typical scenario, the device administrator or operators are required to manage devices in bulk. In the earlier sections, we looked at the device twin, which maintains properties and tags. Conceptually, the job is nothing but a wrapper on the possible actions, which can be done in bulk.

Suppose we have a scenario in which we need to update the properties for multiple devices; in such a case, one can schedule the job and track the progress of the job. I would like to set the frequency to send the data every 1 hour instead of every 30 minutes for 1000 IoT devices. Another example could be to reboot multiple devices at the same time.

Device administrators can perform device registrations in bulk using the export and import methods.

How to do it...

...

IoT Hub query explorer

IoT Hub supports a SQL-like language to retrieve information regarding device twins, jobs, and message routing. Basically, you can write a basic SQL command and that will be executed against the device registry.

Each query follows the syntax like SQL; it has the standard SELECT, FROM, and WHERE keywords used to retrieve the result set in the result window.

How to do it...

In this section, we will follow the steps to use the query explorer and retrieve the device information in the results window:

  1. we will select the IoT Hub IoTHubCookBook service from the Azure portal.
  2. Select Query Explorer:
  1. Using the execution windows, type the query you want to execute:
  1. The output will be shown in the result...
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Key benefits

  • •Build secure and scalable IoT solutions with Azure IoT platform
  • •Learn techniques to build end to end IoT solutions leveraging the Azure IoT platform
  • •Filled with practical recipes to help you increase connectivity and automation across IoT devices

Description

Microsoft’s end-to-end IoT platform is the most complete IoT offering, empowering enterprises to build and realize value from IoT solutions efficiently. It is important to develop robust and reliable solutions for your organization to leverage IoT services. This book focuses on how to start building custom solutions using the IoT hub or the preconfigured solution of Azure IoT suite. As a developer, you will be taught how to connect multiple devices to the Azure IoT hub, develop, manage the IoT hub service and integrate the hub with cloud. We will be covering REST APIs along with HTTP, MQTT and AMQP protocols. It also helps you learn Pre-Configured IoT Suite solution. Moving ahead we will be covering topics like:-Process device-to-cloud messages and cloud-to-device messages using .Net-Direct methods and device management-Query Language, Azure IoT SDK for .Net-Creating and managing, Securing IoT hub, IoT Suite and many more. We will be using windows 10 IoT core, Visual Studio, universal Windows platform. At the end, we will take you through IoT analytics and provide a demo of connecting real device with Azure IoT.

Who is this book for?

If you are an application developer and want to build robust and secure IoT solution for your organization using Azure IoT, then this book is for you.

What you will learn

  • • Build IoT Solutions using Azure IoT & Services
  • • Learn device configuration and communication protocols
  • • Understand IoT Suite and Pre-configured solutions
  • • Manage Secure Device communications
  • • Understand Device management, alerts
  • • Introduction with IoT Analytics, reference IoT Architectures
  • • Reference Architectures from Industry
  • • Pre-Configured IoT Suite solutions
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Aug 11, 2017
Length: 254 pages
Edition : 1st
Language : English
ISBN-13 : 9781787283008
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ISBN-13 : 9781787283008
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Microsoft
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Tools :

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Table of Contents

9 Chapters
Getting Started with the Azure IoT Platform Chevron down icon Chevron up icon
Introducing Device Management Chevron down icon Chevron up icon
IoT Hub Messaging and Commands Chevron down icon Chevron up icon
Azure IoT Communication Protocols Chevron down icon Chevron up icon
Azure IoT Hub Security and Best Practices Chevron down icon Chevron up icon
IoT Suite and Pre-Configured Solutions Chevron down icon Chevron up icon
Azure IoT Analytics Chevron down icon Chevron up icon
Using Real Devices to Connect and Implement Azure IoT Hub Chevron down icon Chevron up icon
Managing the Azure IoT Hub Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
(3 Ratings)
5 star 66.7%
4 star 0%
3 star 0%
2 star 33.3%
1 star 0%
Rahul Deshmukh Apr 03, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Very good book
Amazon Verified review Amazon
Rakesh Oct 06, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book really looks awesome. The content is well structured with crisp content. Has a lot of practical content rather than just theory. I definitely recommend this book for novice to advanced users. Kudos.
Amazon Verified review Amazon
Brian E. Adams Apr 21, 2018
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
I bought this thinking it would help with getting started in IoT vis-á-vis Azure, which is not the case...In short, it is simply a collection of randomly-organized and unexplained code snippets and screenshots of cloud components, with no useful overviews or underlying structure.Starting with meaningful articulation and even summarized architecture of the services might have made the otherwise immediate dive into vague code samples more meaningful and useful.If you’re looking for snippets, fire up a browser and search. If you’re looking for how to get started in IoT in Azure, find another source for the information.It’s not a bad read, it just has a lot of words and doesn’t really say anything...
Amazon Verified review Amazon
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