Add Vortek hotend rack tracking: per-SN registry with slot mapping confirmed against live MQTT capture, plus a fallback for non-inductive nozzles (e.g. H2C's fixed left nozzle) shown read-only without fabricated identity. New dashboard card hides entirely on printers with no Vortek/nozzle-info data at all.

tests/test_hotend_parsing.py

@@ -0,0 +1,100 @@
+from bambu_run.mqtt_client import PrinterState
+
+
+def real_nozzle_payload():
+    """Real captured device.nozzle payload from a live H2C with a Vortek rack
+    (1x AMS, 1x AMS 2 Pro, 1x AMS HT physically connected — unrelated here).
+    SN/used-time cross-checked against the user's Bambu Studio Hotends Info table."""
+    return {
+        "exist": 3997699,
+        "src_id": 17,
+        "tar_id": 17,
+        "state": 0,
+        "info": [
+            {"id": 21, "sn": "20D06A5B2918952", "type": "HS01", "diameter": 0.4,
+             "fila_id": "GFA01", "color_m": "FFFFFFFF", "p_t": 11472, "wear": 128.0, "stat": 0, "tm": 350},
+            {"id": 1, "sn": "N/A", "type": "HS01", "diameter": 0.4,
+             "fila_id": "", "color_m": "00000000", "p_t": 0, "wear": 0.0, "stat": 0, "tm": 0},
+            {"id": 16, "sn": "20D06A5B2919219", "type": "HS01", "diameter": 0.4,
+             "fila_id": "GFA01", "color_m": "A3D8E1FF", "p_t": 105386, "wear": 128.0, "stat": 0, "tm": 350},
+            {"id": 20, "sn": "20D06A590610257", "type": "HS01", "diameter": 0.4,
+             "fila_id": "GFG01", "color_m": "00000000", "p_t": 81506, "wear": 128.0, "stat": 0, "tm": 350},
+            {"id": 18, "sn": "20D06A591506263", "type": "HS01", "diameter": 0.4,
+             "fila_id": "GFA01", "color_m": "DE4343FF", "p_t": 30962, "wear": 128.0, "stat": 0, "tm": 350},
+            {"id": 0, "sn": "20D06A5C0426280", "type": "HS01", "diameter": 0.4,
+             "fila_id": "GFA00", "color_m": "FEC600FF", "p_t": 93490, "wear": 128.0, "stat": 0, "tm": 350},
+            {"id": 19, "sn": "20D06A5C0207881", "type": "HS01", "diameter": 0.4,
+             "fila_id": "GFA01", "color_m": "DE4343FF", "p_t": 1430, "wear": 128.0, "stat": 0, "tm": 350},
+        ],
+    }
+
+
+def make_data(nozzle_payload):
+    return {"print": {"gcode_state": "IDLE", "device": {"nozzle": nozzle_payload}}}
+
+
+def test_snapshot_includes_one_hotend_per_nozzle_info_entry():
+    state = PrinterState.from_mqtt_data(make_data(real_nozzle_payload()))
+    snapshot = state.get_snapshot()
+
+    assert len(snapshot["hotends"]) == 7
+
+
+def test_hotend_fields_extracted_correctly():
+    state = PrinterState.from_mqtt_data(make_data(real_nozzle_payload()))
+    snapshot = state.get_snapshot()
+
+    by_sn = {h["serial_number"]: h for h in snapshot["hotends"]}
+    h = by_sn["20D06A5B2919219"]
+
+    assert h["raw_id"] == 16
+    assert h["nozzle_type"] == "HS01"
+    assert h["diameter"] == 0.4
+    assert h["fila_id"] == "GFA01"
+    assert h["color"] == "A3D8E1"  # alpha stripped
+    assert h["used_time_seconds"] == 105386
+    assert h["wear_percent"] == 100.0  # 128/128*100
+    assert h["is_empty"] is False
+
+
+def test_id_zero_is_toolhead_and_resolves_slot_number():
+    state = PrinterState.from_mqtt_data(make_data(real_nozzle_payload()))
+    snapshot = state.get_snapshot()
+
+    by_sn = {h["serial_number"]: h for h in snapshot["hotends"]}
+    toolhead = by_sn["20D06A5C0426280"]
+
+    assert toolhead["raw_id"] == 0
+    assert toolhead["is_toolhead"] is True
+    assert toolhead["slot_number"] is None  # true bay address hidden while id==0 sentinel
+
+
+def test_rack_bay_ids_resolve_to_slot_numbers_one_through_six():
+    state = PrinterState.from_mqtt_data(make_data(real_nozzle_payload()))
+    snapshot = state.get_snapshot()
+
+    by_sn = {h["serial_number"]: h for h in snapshot["hotends"]}
+
+    assert by_sn["20D06A5B2919219"]["slot_number"] == 1  # raw_id 16
+    assert by_sn["20D06A591506263"]["slot_number"] == 3  # raw_id 18
+    assert by_sn["20D06A5C0207881"]["slot_number"] == 4  # raw_id 19
+    assert by_sn["20D06A590610257"]["slot_number"] == 5  # raw_id 20
+    assert by_sn["20D06A5B2918952"]["slot_number"] == 6  # raw_id 21
+
+
+def test_empty_bay_with_na_serial_is_flagged_empty():
+    state = PrinterState.from_mqtt_data(make_data(real_nozzle_payload()))
+    snapshot = state.get_snapshot()
+
+    by_sn = {h["serial_number"]: h for h in snapshot["hotends"]}
+    empty = by_sn["N/A"]
+
+    assert empty["is_empty"] is True
+    assert empty["is_toolhead"] is False
+
+
+def test_snapshot_hotends_empty_list_when_no_nozzle_payload():
+    state = PrinterState.from_mqtt_data({"print": {"gcode_state": "IDLE"}})
+    snapshot = state.get_snapshot()
+
+    assert snapshot["hotends"] == []