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tunbridge.py opens a TUN device (gbtun0, 10.0.0.1/24), NATs 10.0.0.0/24 out
to the internet, spawns the emulator, and bridges raw IP packets on the TUN
to/from SLIP frames on the link serial. The Game Boy (10.0.0.2) becomes a
genuine routed IP host: the host kernel routes its packets for real, so the
host's own `ping` command reaches it and netd answers.
Verified: `sudo python3 tools/tunbridge.py netd --test`
64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=1.61 ms
4 packets transmitted, 4 received, 0% packet loss
Two hard-won gotchas baked in:
- Under sudo, ~ expands to /root, so resolve EMU/ROM via $SUDO_USER's home.
- Only start feeding host->GB packets AFTER netd is running; raw packet
bytes delivered to gbos's shell (before netd claims the serial) corrupt
the shell and crash the emulator. gb->host draining starts immediately.
Requires /dev/net/tun (on Proxmox LXC: allow cgroup2 device c 10:200 rwm +
bind-mount /dev/net/tun into the container).
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