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Which Industrial Protocols Can a W5500 and ESP32-S3 Detect on an OT Network?

Five: Modbus TCP, S7, PROFINET DCP, OPC UA and EtherNet/IP. This ESP32-S3 firmware runs the W5500 in promiscuous mode to read Layer 2 frames.

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Published August 27, 2026

Original author: Francesco Adriani · ItalyOriginal source (new tab)

Which Industrial Protocols Can a W5500 and ESP32-S3 Detect on an OT Network?

Components

Hardware components

WIZnet parts

Project description

An ESP32 Firmware That Watches Five Industrial Protocols Francesco Adriani works in Perugia, Italy, and describes himself on GitHub as an OT cybersecurity and automation engineer covering PLC, SCADA and MES systems, industrial protocols, and teaching. His account, opened in October 2022 under the handle il-prof-f-a, holds seventeen public repositories, many of them small Python and Java teaching pieces, two local-only MQTT bridges for Tuya and Kasa devices, and an ESP32 bell manager for schools and workplaces. ESP32-OT-Security-Assessment is a much larger piece of work: roughly 90,000 lines…

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