jensandClaude Sonnet 5
b6b79adff8
The backup has already been deleted from the Pi, so the note is done. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YaPLuRPpyjWcwhMvCvpHCL
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brewpi Pi deployment notes
config.json is gitignored (.gitignore:6) - it's generated per-deployment
from config-real.json.tpl/config-sim.json.tpl, not tracked in git, so
notes about its actual on-Pi content have to live here instead.
Heater/Stirrer port should use /dev/serial/by-id/..., not /dev/ttyUSB0//dev/ttyACM0
Found 2026-07-03: unplugging the Hendi mid-brew (to test the connect/
disconnect feature, and the crash-recovery fix that followed) caused both
USB-serial adapters to renumber on replug - /dev/ttyUSB0 became
/dev/ttyUSB1, /dev/ttyACM0 became /dev/ttyACM1. config.json still
pointed at the old raw device paths, so a plain reconnect kept failing
(wrong port, not a code bug) until config.json was updated to the stable
/dev/serial/by-id/... symlinks udev already provides on this Pi:
Heater.port: /dev/serial/by-id/usb-JDI_Hendi-Control_AM3VLPVE-if00-port0
Stirrer.port: /dev/serial/by-id/usb-Pololu_Corporation_Pololu_Simple_High-Power_Motor_Controller_18v15_53FF-6F06-7277-5049-3950-0767-if00
Since raw /dev/ttyUSB*//dev/ttyACM* numbering isn't stable across
replugs (and a real unplug is exactly the scenario the connect/disconnect
feature exists to handle gracefully), config.json should keep using the
by-id paths above rather than reverting to /dev/ttyUSB0//dev/ttyACM0.