To get the most out of this book

The examples are written in modern C++ by using ESP-IDF (the major development framework for ESP32, maintained by Espressif Systems). Therefore, a basic understanding of modem C++ concepts would be beneficial to get a better grasp of the subjects discussed in the book. Although not required, some familiarity with using command-line tools in a terminal window could also help to follow the examples.

I tried to explain all the subjects in the scope of the book in as much detail as possible. Nevertheless, IoT is a vast field to talk about in a single book, so I appended a Further reading section at the end of most of the chapters in case you need some background information. If you find it difficult to follow any of the underlying subjects in a chapter, reading the reference books listed in the Further reading sections will support you in understanding the examples of that specific chapter better.

Download the example code files

The code bundle for the book is hosted on GitHub at https://github.com/PacktPublishing/Developing-IoT-Projects-with-ESP32-2nd-edition. We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Download the color images

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://packt.link/gbp/9781803237688.

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. For example: “Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system.”

A block of code is set as follows:

[default]
exten => s,1,Dial(Zap/1|30)
exten => s,2,Voicemail(u100)
exten => s,102,Voicemail(b100)
exten => i,1,Voicemail(s0)

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

[default]
exten => s,1,Dial(Zap/1|30)
exten => s,2,Voicemail(u100)
exten => s,102,Voicemail(b100)
exten => i,1,Voicemail(s0)

Any command-line input or output is written as follows:

# cp /usr/src/asterisk-addons/configs/cdr_mysql.conf.sample
     /etc/asterisk/cdr_mysql.conf

Bold: Indicates a new term, an important word, or words that you see on the screen. For instance, words in menus or dialog boxes appear in the text like this. For example: “Select System info from the Administration panel.”