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STM32F401 W5500 UDP Gateway with Web Control

STM32F401 and W5500 demo with a web UI and UDP gateway over wired Ethernet.

Benjamin

Published May 18, 2026

166 UCC

11 WCC

31 VAR

2 Following

Original author: Muhammad Jumi'at Mokhtar / MJ Mokhtar · IndonesiaOriginal source (new tab)

STM32F401 W5500 UDP Gateway with Web Control

Components

Hardware components
W5500

WIZnet - W5500

x 1

STM32F411RE

STMicroelectronics - STM32F411RE

x 1

WIZnet parts

Project description

STM32F401 Ethernet Gateway with W5500 Sockets This project is a wired Ethernet IoT gateway demo for the STM32F401 microcontroller using the WIZnet W5500 Ethernet controller. It brings up the W5500 over SPI, obtains an IP address through DHCP, serves a small HTTP interface, and relays UDP messages through the W5500 socket API. The technically interesting point is that the STM32F401 does not run a software TCP/IP stack for the main network path. The W5500 handles the TCP and UDP socket engine, while the MCU focuses on SPI control, the web UI logic, and the UDP message gateway. The application…

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