[tssva]

> I’m curious if there’s room on the pico (or just with an RP2040) for Ethernet to send E1.31 protocol messages to it, and have it drive LEDs.

There are several RP2040 boards available including the Pico W which include WiFi.

If you are looking for wired Ethernet your best bet is to add a WIZnet W5500 SPI Ethernet module. Besides connecting a module to an existing RP2040 based board WIZnet makes an evaluation board which combines a RP2040 and W5500 on a board. All the RP2040 pins are exposed. If you use the Arduino ecosystem the Ethernet library shipped with Arduino core for the RP2040 includes support for the W5500.