Follow-up to the #1322 root fix. Reporter @RosdasHH traced the raw MQTT
payload and found that P1S and A1 Mini send only {"id": N} for a
physically empty slot — no state, no tray_type, no other fields. Without
that signal, the assign-spool path was firing one wasted MQTT publish per
click on a truly-empty slot (firmware dropped it silently, but still).
The AMS parser in printer_manager.py now detects the bare-tray shape and
promotes it to state=9 — the firmware's explicit "no spool" code — which
lets the existing state in {9, 10} short-circuit in the inventory route
apply automatically.
The detection is intentionally narrow:
len(tray) == 1 and "id" in tray and state is None
so the post-Reset-Slot A1 Mini BMCU case (populated payload with state=3
and tray_type="") has more than one key and stays unaffected — the #1322
root fix is preserved.
maziggy
7d3af9834c