STM32Ethernet — W5500 Ethernet library for STM32 (Modbus TCP included)

[Amir13600631]

Hi everyone,

I just released STM32Ethernet, a lightweight W5500 Ethernet library
for STM32, compatible with the STM32duino Arduino core.

Built and tested on STM32F446RE (Nucleo-64) with a WIZ550io module.

Features:

• TCP server and client
• Modbus TCP slave (FC03, FC16)
• Modbus TCP master with auto-reconnect
• BSB-aware W5500 SPI register access
• PHY link detection

GitHub: https://github.com/amir13600631/STM32Ethernet

Feedback and contributions welcome!

[fpistm]

Hi @Amir13600631 ,
thanks for sharing. One comment, using the same header name to include the library is not a good idea.
If user have both libraries installed then this will result in a conflict as Arduino should not be able to select the correct one.

[Amir13600631]

Hi @fpistm
Thank you for the feedback, I have changed it to W5500Ethernet.

[uzi18]

@Amir13600631 what about Arduino Ethernet library compatible interface?

[Amir13600631]

The standard library is built for slow Arduinos and doesn't understand the high-speed clock math of Nucleo. Because the STM32's internal speeds don't divide evenly into what the library expects, the communication becomes unstable or fails. It’s like trying to put a lawnmower gearbox into a race car, it just can't handle the power and timing.