---
title: "ESP32 + W5500 MQTT"
url: "https://maker.wiznet.io/sophia/projects/esp32-w5500-mqtt-1/"
markdown_url: "https://maker.wiznet.io/sophia/projects/esp32-w5500-mqtt-1/md"
type: "UCC: User Created Content"
author: "taha842"
author_url: "https://github.com/taha842/ESP32_W5500_MQTT"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "taha842"
original_url: "https://github.com/taha842/ESP32_W5500_MQTT"
published: "2026-04-03"
language: "ko"
hardware: ["WIZnet W5500"]
likes: 0
views: 250
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# ESP32 + W5500 MQTT

> ESP32와 WIZnet W5500 Ethernet 컨트롤러를 활용하여 MQTT 기반 IoT 통신 시스템을 구현한 대표적인 Hybrid Networking 사례

Original author: taha842 (source: https://github.com/taha842/ESP32_W5500_MQTT)

## Components

- **WIZnet W5500** x 1 ([docs](https://docs.wiznet.io/Product/Chip/Ethernet/W5500))

WIZnet parts: W5500 ([Datasheet](https://docs.wiznet.io/Product/Chip/Ethernet/W5500/datasheet?utm_source=maker&utm_medium=project&utm_campaign=w5500), [product hub](https://maker.wiznet.io/products/w5500/))

## Article

### 프로젝트 개요

본 프로젝트는 ESP32와 WIZnet W5500 Ethernet 컨트롤러를 활용하여
**MQTT 기반 IoT 통신 시스템을 구현한 대표적인 Hybrid Networking 사례**입니다.

Wi-Fi 대신 **유선 Ethernet을 적용하여 안정성과 신뢰성을 확보**하며,
MQTT Broker와의 Publish/Subscribe 구조를 통해 IoT 데이터를 효율적으로 처리합니다.

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### 🔧 주요 기술 요소

- ESP32 (MCU)

- W5500 (Hardware TCP/IP Offload Engine)

- MQTT (Pub/Sub Protocol)

- SPI 기반 Ethernet 통신

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### ⚙️ 구현 기능

- MQTT Broker 연결

- Topic Subscribe / Publish

- 실시간 메시지 송수신

- Serial Monitor 기반 데이터 확인

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### 💡 기술 포인트

- W5500의 **TOE(TCP/IP Offload Engine)** 사용으로 MCU 부하 감소

- Wi-Fi 대비 낮은 latency와 높은 안정성 확보

- 간단한 구조로 빠른 IoT 프로토타이핑 가능

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### 🌐 Hybrid Networking 관점

ESP32 (Wi-Fi MCU) + W5500 (Ethernet) 조합을 통해
👉 **무선 + 유선 네트워크의 장점을 결합한 구조**

특히 산업 환경에서 유선 기반 IoT 설계에 적합

### Overview

This project demonstrates a **Hybrid Networking IoT system** using ESP32 and the WIZnet W5500 Ethernet controller with MQTT communication.

By replacing Wi-Fi with wired Ethernet, it ensures **higher reliability and stability** in IoT environments.

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### 🔧 Key Technologies

- ESP32 (MCU)

- W5500 (Hardware TCP/IP Offload Engine)

- MQTT Protocol

- SPI-based Ethernet communication

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### ⚙️ Features

- MQTT Broker connection

- Publish / Subscribe messaging

- Real-time data exchange

- Serial monitoring

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### 💡 Technical Insights

- Offloads TCP/IP processing via **TOE**

- Lower latency compared to Wi-Fi

- Reliable for industrial IoT

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### 🌐 Hybrid Networking Perspective

Combines:

- Wireless-capable MCU (ESP32)

- Wired Ethernet (W5500)

👉 Creates a **robust hybrid IoT network architecture**

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Source: https://maker.wiznet.io/sophia/projects/esp32-w5500-mqtt-1/