Book Image

Practical Python Programming for IoT

By : Gary Smart
Book Image

Practical Python Programming for IoT

By: Gary Smart

Overview of this book

The age of connected devices is here, be it fitness bands or smart homes. It's now more important than ever to understand how hardware components interact with the internet to collect and analyze user data. The Internet of Things (IoT), combined with the popular open source language Python, can be used to build powerful and intelligent IoT systems with intuitive interfaces. This book consists of three parts, with the first focusing on the "Internet" component of IoT. You'll get to grips with end-to-end IoT app development to control an LED over the internet, before learning how to build RESTful APIs, WebSocket APIs, and MQTT services in Python. The second part delves into the fundamentals behind electronics and GPIO interfacing. As you progress to the last part, you'll focus on the "Things" aspect of IoT, where you will learn how to connect and control a range of electronic sensors and actuators using Python. You'll also explore a variety of topics, such as motor control, ultrasonic sensors, and temperature measurement. Finally, you'll get up to speed with advanced IoT programming techniques in Python, integrate with IoT visualization and automation platforms, and build a comprehensive IoT project. By the end of this book, you'll be well-versed with IoT development and have the knowledge you need to build sophisticated IoT systems using Python.
Table of Contents (20 chapters)
1
Section 1: Programming with Python and the Raspberry Pi
6
Section 2: Practical Electronics for Interacting with the Physical World
9
Section 3: IoT Playground - Practical Examples to Interact with the Physical World

Chapter 4

  1. MQTT, or Message Queue Telemetry Protocol, is a lightweight messaging protocol frequently used in distributed IoT networks.
  2. Check the QoS levels, making sure they are either level 1 or 2.
  3. A Will message will be published on behalf of a client if that client abruptly disconnects from the broker without cleanly closing the connection first.
  4. Both the published message and subscribing clients must use at least QoS level 1, which ensures messages are delivered one or more times.
  1. Ideally, nothing should need to change in your Python code other than perhaps the broker host and port because MQTT is an open standard. The proviso is that the new broker is configured similarly to the broker being replaced – for example, both brokers are configured similarly to provide message retention or durable connection features to clients.
  2. You should subscribe to topics in an on successful connection-type handler. This way, if the client loses its broker connection, it can...