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feat(deploy): add stable USB serial symlinks for BATM3

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USB-serial adapters enumerate in unpredictable order on reboot,
causing ttyUSB0/1/2 to swap between the F56 dispenser, MEI
validator, and NFC module. Add udev rules that create stable
symlinks by adapter serial number:

- /dev/ttyF56 → Prolific DDDLb103Y23 (F56 dispenser)
- /dev/ttyMEI → FTDI A9YW78OC (MEI cash recycler)
- /dev/ttyNFC → FTDI A9ZF8ELY (NFC module)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Patrick Mulligan 2026-03-27 20:35:53 -04:00
commit 6cf372055f
1 changed files with 4 additions and 0 deletions
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4
deploy/nixos/hardware/batm3.nix
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@ -68,9 +68,13 @@
};
# Serial port access for bill validator/dispenser (USB-serial adapters)
# Stable symlinks by adapter serial number (prevents ttyUSB reordering on reboot)
services.udev.extraRules = lib.mkAfter ''
KERNEL=="ttyS[0-9]*", MODE="0666"
KERNEL=="ttyUSB[0-9]*", MODE="0666"
KERNEL=="ttyACM[0-9]*", MODE="0666"
SUBSYSTEM=="tty", ATTRS{serial}=="DDDLb103Y23", SYMLINK+="ttyF56", MODE="0666"
SUBSYSTEM=="tty", ATTRS{serial}=="A9YW78OC", SYMLINK+="ttyMEI", MODE="0666"
SUBSYSTEM=="tty", ATTRS{serial}=="A9ZF8ELY", SYMLINK+="ttyNFC", MODE="0666"
'';
}