COAP (Constrained Application Protocol) is a specialized internet protocol designed for low-power, low-bandwidth, and low-complexity networks such as IoT (Internet of Things). This tutorial will give you an overview of COAP and how it works.

Basic Concepts

  • COAP Messages: COAP uses simple request and response messages for communication.
  • Resources: COAP operates on resources identified by URIs (Uniform Resource Identifiers).
  • Datagram-based: COAP is a datagram-based protocol, meaning it uses UDP for transport.

How COAP Works

  1. Client-Server Communication: Clients send requests to servers to retrieve or modify resources.
  2. Methods: COAP defines several HTTP-like methods, such as GET, POST, PUT, and DELETE.

Example of a COAP Request

GET /light?on true HTTP/1.1

This request is asking the server to turn the light on.

Common Use Cases

  • Sensor Data: COAP is often used to retrieve sensor data from IoT devices.
  • Remote Control: It can be used to control IoT devices over a network.
  • Home Automation: COAP is ideal for home automation applications.

Further Reading

To dive deeper into COAP, check out our detailed guide on COAP Basics.

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