---
title: "How to Implement Real-Time UDP Communication with STM32 and W5500 over Ethernet?"
url: "https://maker.wiznet.io/ronpang/projects/how-to-implement-real-time-udp-communication-with-stm32-and-w5500-over-ethernet/"
markdown_url: "https://maker.wiznet.io/ronpang/projects/how-to-implement-real-time-udp-communication-with-stm32-and-w5500-over-ethernet/md"
type: "UCC: User Created Content"
author: "小蚂蚁2020"
author_url: "https://www.bilibili.com/video/BV1ve41127ET/?spm_id_from=333.1387.collection.video_card.click&vd_source=ab013cc5ffdecedae5ee47ae256d7306"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "小蚂蚁2020"
original_url: "https://www.bilibili.com/video/BV1ve41127ET/?spm_id_from=333.1387.collection.video_card.click&vd_source=ab013cc5ffdecedae5ee47ae256d7306"
published: "2026-02-27"
language: "en"
likes: 0
views: 271
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# How to Implement Real-Time UDP Communication with STM32 and W5500 over Ethernet?

> This project demonstrates real-time UDP communication using STM32 and the WIZnet W5500 Ethernet controller.

Original author: 小蚂蚁2020 (source: https://www.bilibili.com/video/BV1ve41127ET/?spm_id_from=333.1387.collection.video_card.click&vd_source=ab013cc5ffdecedae5ee47ae256d7306)

## Article

## How to Implement Real-Time UDP Communication with STM32 and W5500 over Ethernet?

## (STM32와 W5500으로 이더넷 기반 실시간 UDP 통신 구현하기)

---

### Project Summary (55 words)

This project demonstrates real-time UDP communication using STM32 and the WIZnet W5500 Ethernet controller. By leveraging hardware UDP/IP offloading over wired Ethernet, the system achieves low-latency data transmission suitable for educational networking experiments, LAN-based telemetry, and lightweight industrial communication applications.

---

### System Architecture Overview

#### Core Components

**STM32**

Data acquisition

Packet formatting

Application logic

**W5500**

Hardware TCP/IP stack

Native UDP socket support

SPI interface

Ethernet connectivity

---

### Network Architecture & Protocol Flow

#### Layered Model

Application (STM32)
↓
UDP (W5500)
↓
IP (W5500)
↓
Ethernet PHY

#### Data Flow

STM32 → SPI → W5500 → Ethernet → Client Device

---

### Why Choose UDP?

| Feature | UDP |
| --- | --- |
| Handshake required | No |
| Latency | Low |
| Reliability guarantee | No |
| Overhead | Minimal |

UDP is ideal for:

Real-time sensor streaming

Broadcast communication

Discovery protocols

Educational demonstrations

---

### Ethernet vs Wi-Fi for UDP

| Aspect | W5500 Ethernet | Wi-Fi |
| --- | --- | --- |
| Latency variation | Low | Higher |
| Packet stability | High | Variable |
| RF interference | None | Possible |
| Determinism | Strong | Moderate |

For educational labs, Ethernet ensures consistent experimental results.

---

### Educational Perspective

This project helps students understand:

Difference between TCP and UDP

Network layering principles

Hardware TCP/IP offloading benefits

Real-time communication trade-offs

It provides a clear and practical introduction to embedded Ethernet networking.

---

### FAQ (WIZnet-Focused)

**Q1: Why use W5500 for UDP communication?**
A: W5500 provides hardware UDP/IP processing, reducing MCU overhead and improving determinism.

**Q2: How does STM32 communicate with W5500?**
A: Through an SPI interface.

**Q3: Is UDP suitable for industrial use?**
A: Yes, especially for real-time telemetry where occasional packet loss is acceptable.

**Q4: Can this be extended to TCP?**
A: Yes. W5500 supports both TCP and UDP sockets.

**Q5: Is this suitable for education?**
A: Yes. It clearly demonstrates connectionless communication and network layering.

---

### Tags

#W5500 #STM32 #UDP #Ethernet #EmbeddedNetworking #Education #IndustrialIoT

---

---

## 🇰🇷 KOREAN VERSION

## STM32와 W5500으로 이더넷 기반 실시간 UDP 통신을 구현하는 방법은?

## (How to Implement Real-Time UDP Communication with STM32 and W5500 over Ethernet?)

---

### 프로젝트 개요 (55단어)

이 프로젝트는 STM32와 WIZnet W5500 이더넷 컨트롤러를 사용하여 UDP 기반 실시간 통신을 구현합니다. 하드웨어 UDP/IP 오프로딩을 통해 낮은 지연시간과 안정적인 유선 통신을 제공하며, 교육용 네트워크 실습 및 경량 산업 통신에 적합합니다.

---

### 시스템 구성

STM32: 데이터 수집 및 패킷 생성

W5500: 하드웨어 UDP/IP 처리

Ethernet: 안정적인 유선 통신

---

### 네트워크 아키텍처

STM32 → SPI → W5500 → Ethernet → 수신 장치

UDP는 핸드셰이크 없이 빠른 전송이 가능합니다.

---

### Ethernet vs Wi-Fi

이더넷은:

낮은 지연 변동

RF 간섭 없음

예측 가능한 동작

교육 환경에 적합합니다.

---

### FAQ

**Q1: 왜 W5500을 사용하나요?**
A: 하드웨어 UDP 처리를 통해 MCU 부하를 줄이기 위해서입니다.

**Q2: STM32와 연결 방식은?**
A: SPI 인터페이스입니다.

**Q3: 산업용에도 적합합니까?**
A: 실시간 텔레메트리 용도로 적합합니다.

**Q4: TCP로 확장 가능합니까?**
A: 네, W5500은 TCP도 지원합니다.

**Q5: 교육용으로 좋은가요?**
A: 네, TCP와 UDP의 차이를 학습하기에 적합합니다.

---

Source: https://maker.wiznet.io/ronpang/projects/how-to-implement-real-time-udp-communication-with-stm32-and-w5500-over-ethernet/