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. Here is an example: "Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system."

A block of code is set as follows:

@staticmethod
    def on_subscribe(client, userdata, mid, granted_qos):
        print("I've subscribed with QoS: {}".format(
            granted_qos[0]))

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

 time.sleep(0.5) 
       client.disconnect() 
       client.loop_stop() 

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

 sudo apt-add-repository ppa:mosquitto-dev/mosquitto-ppa

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Select System info from the Administration panel."

Warnings or important notes appear like this.

Tips and tricks appear like this.