Application Protocols

Choosing and using IoT application-layer protocols: protocol roles and selection, HTTP/REST, real-time and web protocols, and XMPP, alongside the MQTT, CoAP, and AMQP protocol books.

Your guide: Broker Bex

“A message with no subscriber is a tree falling in an empty forest — design the topic before the payload.”

About This Module

This is Part 3.5 of the IoT Class curriculum. It contains 8 chapters organised into 2 parts. Use this page as a route map, or use the sidebar and search to move between chapters.

Application Protocols route map with two numbered stages: (1) Protocol Overview and Selection, 2 chapters; (2) HTTP and Web Protocols, 6 chapters. — Figure 1: Two-stage route map for the Application Protocols module: protocol overview and selection, then HTTP and web protocols, each labeled with its chapter count.

Chapters by Part

Protocol Overview & Selection

HTTP & Web Protocols

Sibling Protocol Books

This overview book covers protocol selection and the HTTP/web family. The three high-volume messaging protocols each have their own dedicated book — start with the protocol comparison to decide, then dive into the matching book:

MQTT

Best for: telemetry streams, commands, device shadows, and gateway-to-cloud messaging over unreliable links.

Start with: MQTT Publish-Subscribe Basics

CoAP

Best for: constrained nodes, local control, and REST-style resources over UDP.

Start with: CoAP Fundamentals

AMQP

Best for: enterprise back ends, durable queues, routing rules, and reliable service-to-service messaging.

Start with: AMQP Core Concepts

How to Use This Material

Start with the why: each chapter explains the problem it solves before implementation detail.
Follow the parts in order when the topic is new, or jump straight to the part that matches your current question.
Use the interactions and labs as the primary learning tools, not just the prose.

Use the sidebar navigation or search to explore topics in this module.

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