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How Does Rust Enable Protocol Break Security on W5500-EVB-Pico?

Implements a Protocol Break Relay—a security pattern from the Cross Domain Solution (CDS) domain—using Rust on the W5500-EVB-Pico board.

Benjamin

Published January 06, 2026 · © MIT license (MIT)

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Original author: lhalfOriginal source (new tab)

How Does Rust Enable Protocol Break Security on W5500-EVB-Pico?

Components

Hardware components
W5500-EVB-Pico

WIZnet - W5500-EVB-Pico

x 1

RP2040

Raspberry Pi - RP2040

x 1

Project description

1. What This Project Does From the project README: "Uses the WIZnet W5500 on the W5500-EVB-Pico in MACRAW mode to pass raw packets to the RP2040. A protocol break is implemented by throwing away the protocol information of received packets, then the payload is validated as JSON, and finally a new UDP packet is constructed to forward the contents on." This implements a protocol break relay—a security pattern where: Raw Ethernet packets are received via W5500 MACRAW mode All protocol headers are discarded Only the payload is extracted and validated as JSON A completely new UDP packet is…

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