jensandClaude Sonnet 5
9cd386a22e
config.json isn't tracked in git, so this records what changed on the Pi during today's connect/disconnect testing: Heater/Stirrer ports switched from /dev/ttyUSB0//dev/ttyACM0 to stable /dev/serial/by-id/... paths after a replug renumbered both devices, plus a reminder to remove the pre-edit config.json.bak-20260703212821 left on the Pi. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YaPLuRPpyjWcwhMvCvpHCL
33 lines
1.6 KiB
Markdown
33 lines
1.6 KiB
Markdown
# brewpi Pi deployment notes
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`config.json` is gitignored (`.gitignore:6`) - it's generated per-deployment
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from `config-real.json.tpl`/`config-sim.json.tpl`, not tracked in git, so
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notes about its actual on-Pi content have to live here instead.
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## Heater/Stirrer `port` should use `/dev/serial/by-id/...`, not `/dev/ttyUSB0`/`/dev/ttyACM0`
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Found 2026-07-03: unplugging the Hendi mid-brew (to test the connect/
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disconnect feature, and the crash-recovery fix that followed) caused both
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USB-serial adapters to renumber on replug - `/dev/ttyUSB0` became
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`/dev/ttyUSB1`, `/dev/ttyACM0` became `/dev/ttyACM1`. `config.json` still
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pointed at the old raw device paths, so a plain reconnect kept failing
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(wrong port, not a code bug) until `config.json` was updated to the stable
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`/dev/serial/by-id/...` symlinks udev already provides on this Pi:
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```
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Heater.port: /dev/serial/by-id/usb-JDI_Hendi-Control_AM3VLPVE-if00-port0
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Stirrer.port: /dev/serial/by-id/usb-Pololu_Corporation_Pololu_Simple_High-Power_Motor_Controller_18v15_53FF-6F06-7277-5049-3950-0767-if00
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```
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Since raw `/dev/ttyUSB*`/`/dev/ttyACM*` numbering isn't stable across
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replugs (and a real unplug is exactly the scenario the connect/disconnect
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feature exists to handle gracefully), `config.json` should keep using the
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by-id paths above rather than reverting to `/dev/ttyUSB0`/`/dev/ttyACM0`.
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## Cleanup: `config.json.bak-20260703212821`
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A timestamped backup (`config.json.bak-20260703212821`) was left next to
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`config.json` on the Pi before the by-id edit above, in case it needed to
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be reverted. It wasn't needed - safe to delete once this note has been
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read: `rm /home/jens/brewpi/config.json.bak-20260703212821`.
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