From eafdce36b6627ae48946238fbcc4c141b4949762 Mon Sep 17 00:00:00 2001
From: Patrick Mulligan <patjmulligan@protonmail.com>
Date: Thu, 30 Jul 2026 00:57:48 +0200
Subject: [PATCH] fix(config): point batm3 validator at /dev/ttyMEI (was
 nonexistent ttyACM0)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The batm3 preset defaulted the EBDS validator to /dev/ttyACM0, assuming a
CDC-ACM BNR Advance. The actual MEI acceptor enumerates as a USB-serial
device (ttyUSB*), exposed via the stable udev symlink /dev/ttyMEI
(batm3.nix). Because /dev/ttyACM0 never existed, hal-service skipped the
validator entirely and logged "[HAL] No validator — cash-in disabled", so
Buy Bitcoin silently ignored inserted bills.

Verified on hardware: with the correct device the validator starts, and
(with the EBDS latch fix) a bill escrows → stacks → credits. Removes the
need for the VITE_LAMASSU_VALIDATOR_DEVICE=/dev/ttyMEI per-box override.

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 9a22ab8..ae4ac00 100644
--- a/apps/machine/src/config/device.ts
+++ b/apps/machine/src/config/device.ts
@@ -139,7 +139,12 @@ export const MACHINE_PRESETS: Record<MachineModel, Omit<DeviceConfig, 'fiatCode'
     model: 'batm3',
     validator: {
       type: 'ebds',
-      device: '/dev/ttyACM0',
+      // MEI bill acceptor (EBDS) on a USB-serial bridge, exposed via the
+      // stable udev symlink /dev/ttyMEI (batm3.nix, serial A9YW78OC). The old
+      // /dev/ttyACM0 default assumed a CDC-ACM BNR; this hardware enumerates as
+      // ttyUSB* instead, so ACM0 never existed and cash-in was silently
+      // disabled ("[HAL] No validator"). Per-box override: VITE_LAMASSU_VALIDATOR_DEVICE.
+      device: '/dev/ttyMEI',
     },
     dispenser: {
       type: 'f56',