Generating Unique MAC Addresses for RP2040 W5500

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Project description

This article covers the MAC address duplication issue and its solution that arises when deploying multiple IoT devices using the RP2040 (Raspberry Pi Pico) + W5500 combination. Key Problem: Since the W5500 does not have pre-assigned MAC addresses, hardcoding the same MAC address across multiple devices results in ARP conflicts and database errors. Recommended Solution: Read the factory-programmed 64-bit unique hardware ID (pico/unique_id.h) from within the RP2040 and convert it into a 6-byte MAC address. Set the first byte to 0x02 to set the LAA (Locally Administered Address) bit, preventing…

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