From 2c71d9d823a1c25a2e4e54e8daba37eb9044f0c2 Mon Sep 17 00:00:00 2001
From: Patrick Mulligan <patjmulligan@protonmail.com>
Date: Thu, 30 Jul 2026 01:14:11 +0200
Subject: [PATCH] fix(config): use stable /dev/ttyF56 symlink for batm3
 dispenser
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The batm3 dispenser used the raw /dev/ttyUSB0, which is
enumeration-order dependent — a re-plug or reboot could reassign
ttyUSB0 to a different adapter. Switch to the stable udev symlink
/dev/ttyF56 (batm3.nix, serial DDDLb103Y23), matching the validator's
/dev/ttyMEI, so both peripherals bind by identity and survive
re-enumeration (incl. on an internal-SATA flash). Per-box override:
VITE_LAMASSU_DISPENSER_DEVICE.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 apps/machine/src/config/device.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/apps/machine/src/config/device.ts b/apps/machine/src/config/device.ts
index ae4ac00..cffdaa3 100644
--- a/apps/machine/src/config/device.ts
+++ b/apps/machine/src/config/device.ts
@@ -148,7 +148,12 @@ export const MACHINE_PRESETS: Record<MachineModel, Omit<DeviceConfig, 'fiatCode'
     },
     dispenser: {
       type: 'f56',
-      device: '/dev/ttyUSB0',
+      // Fujitsu F56 on a USB-serial bridge, via the stable udev symlink
+      // /dev/ttyF56 (batm3.nix, serial DDDLb103Y23). Avoids the raw
+      // /dev/ttyUSB0, which is enumeration-order dependent and could point at
+      // the wrong adapter after a re-plug/reboot. Per-box override:
+      // VITE_LAMASSU_DISPENSER_DEVICE.
+      device: '/dev/ttyF56',
       cassettes: [
         { denomination: 20, count: 400 },
         { denomination: 1, count: 400 },