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This is a web server, but not a full TCP/IP implementation: https://news.ycombinator.com/item?id=19146767

Yes, well aware of it, that's actually very nice for building higher levels of the webserver.

I'd really like to have a complete forth machine dealing with everything, say on an esp32. I guess there's FreeRTOS, so I could use that network layer, but bare metal would be so much cooler. I admit I don't even understand how it would work - would I have to bit-bang the ethernet lines?

You interface with SoC's peripherals rather than bit-bang lines. You can think of them as a kind of memory mapped APIs.

I never interface with the peripheral in an ESP32 directly. I guess I really need to read the Free-RTOS code. Micropython just uses that, last I checked.

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