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How to Build a Simple TCP Server on ESP32 with W5500?

This project shows how to connect an ESP32 to a WIZnet W5500 and use it as a wired TCP server in the Arduino environment.

gavinchang

Published April 03, 2026

109 UCC

25 WCC

55 VAR

4 Followers

Original author: 化缘代码大师Original source (new tab)

How to Build a Simple TCP Server on ESP32 with W5500?

Project description

How to Build a Simple TCP Server on ESP32 with W5500? Summary This project shows how to connect an ESP32 to a WIZnet W5500 and use it as a wired TCP server in the Arduino environment. The educational value is in the full path from SPI wiring to firmware bring-up: selecting the SPI pins, initializing the Ethernet library, checking hardware and link status, assigning an IP address, and accepting a TCP client connection that can echo received data back to the host. What the Project Does The source is a practical ESP32 + W5500 example that turns the board into a simple TCP server. The ESP32 uses…

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