---
title: "MicroPython - STM32 W5500 Ethernet module socket communication"
url: "https://maker.wiznet.io/josephsr/projects/micropython-stm32-w5500-ethernet-module-socket-communication/"
markdown_url: "https://maker.wiznet.io/josephsr/projects/micropython-stm32-w5500-ethernet-module-socket-communication/md"
type: "UCC: User Created Content"
author: "devicemart"
author_url: "https://www.youtube.com/watch?v=xKAXAIUU-xA"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "devicemart"
original_url: "https://www.youtube.com/watch?v=xKAXAIUU-xA"
published: "2025-03-19"
language: "en"
hardware: ["WIZnet W5500", "STMicroelectronics STM32F405RGT6"]
likes: 0
views: 1719
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# MicroPython - STM32 W5500 Ethernet module socket communication

> This project demonstrates how to set up and use socket communication with an STM32 board and a W5500 Ethernet module in a MicroPython environment.

Original author: devicemart (source: https://www.youtube.com/watch?v=xKAXAIUU-xA)

## Components

- **WIZnet W5500** x 1 ([docs](https://docs.wiznet.io/Product/Chip/Ethernet/W5500))
- **STMicroelectronics STM32F405RGT6** x 1
- Software: **MicroPython** ([docs](http://micropython.org/))

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

### **1. Project Overview & FeaturesCore Functionality:**

- Implements **socket communication** in a **MicroPython environment** using an STM32 board and a W5500 Ethernet module.

- Provides a **reliable and efficient Ethernet communication solution** for embedded systems.

**Problem Solved & Purpose:**

- Enables **stable and direct communication** in embedded systems.

- Suitable for **various IoT applications**, including **real-time monitoring, industrial automation, and smart devices**.

**Key Features:**

- **Hardware:** STM32 microcontroller, W5500 Ethernet module

- **Network:** Wired Ethernet using W5500

- **Protocol:** TCP/IP socket communication

- **Data Handling:** MicroPython-based data transmission

---

### **2. Hardware & Software StackHardware:**

- **MCU:** STM32 series board

- **Network Module:** W5500 Ethernet module

- **Additional Peripherals:** No specific sensor mentioned, but can integrate with various sensors

**Software:**

- **Programming Language:** MicroPython

- **Libraries Used:**
  - Built-in **MicroPython networking libraries**
  - W5500 Ethernet driver for MicroPython

- **Network Protocol:** TCP/IP

---

### **3. Key Parts of the Source Code**

#### **Ethernet Connection Setup**

```plaintext
import network
import socket

# Initialize W5500 Ethernet module
nic = network.WIZNET5K(spi, pin_cs, pin_rst)
nic.active(True)
nic.ifconfig(('192.168.1.2', '255.255.255.0', '192.168.1.1', '8.8.8.8'))
```

**Socket Creation & Connection**

```plaintext
# Create a TCP socket
s = socket.socket()
s.bind(('192.168.1.2', 80))
s.listen(5)

while True:
    conn, addr = s.accept()
    print('Connection from', addr)
    # Receive and process data
    data = conn.recv(1024)
    # Send data back
    conn.send(data)
    conn.close()
```

### **4. Comparison with Traditional ImplementationsAdvantages:**
✅ **MicroPython-based:** Faster prototyping with simpler code.
✅ **Hardware TCP/IP Offloading:** The W5500 module handles networking independently, reducing the STM32's processing load.

**Disadvantages:**
❌ **Performance Limitations:** MicroPython is slower compared to C/C++.
❌ **Limited Library Support:** Some advanced networking features may not be available in MicroPython.

---

### **5. Suggested Improvements & Enhancements**

✔ **Security Enhancements:** Implement **TLS/SSL** encryption for secure data transmission.
✔ **Error Handling:** Improve system stability by adding exception handling for **network failures and connection errors**.
✔ **Data Logging:** Enable **local storage (SD card)** or **cloud-based database integration** for long-term data logging.
✔ **Real-time Monitoring:** Implement **a simple web interface** or integrate with **Node-RED** for real-time data visualization.

---

Source: https://maker.wiznet.io/josephsr/projects/micropython-stm32-w5500-ethernet-module-socket-communication/