Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and configuration values are shown as follows: "Sending a packet is handled by the sendPacket() function."

A block of code is set as follows:

// the loop function runs over and over again forever
void loop() {
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);              // wait for a second
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);              // wait for a second
}

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

openssl rand -hex 16

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, also appears in bold like this: "Click on the Update Firmware button to replace the firmware of your device."