TLDR
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AVR64DD32 ($1, 8KB RAM, 64KB flash) runs a TCP/IP stack over SLIP via USB-serial, proxied through a VPS to serve a real webpage.
Key Takeaways
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AVR64DD32 cannot drive 10BASE-T Ethernet directly; IO pins cap at 12 MHz, so SLIP over USB-serial is used instead.
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SLIP (RFC 1055) is still supported in modern Linux via
slattach; setup requires no custom kernel modules or drivers.
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IP layer is trivial: swap src/dst, reset TTL. TCP took several days to implement and still has bugs; HTTP is hardcoded single-response.
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WireGuard tunnels the MCU through a Helsinki VPS, with nginx proxying
/mcu to avoid breaking the main site.
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IPv6 would eliminate the whole public-IP problem; author notes it has existed 30 years but remains inaccessible for many.
Hacker News Comment Review
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