Initial commit: CODESYS tree, integration docs, Node-RED scripts.

PLC application sources (NVL, rooms, boiler), HA/Node-RED integration guide, and NVL patch utilities.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/nodered_global_nvl_state_patch.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+"""Use global context for nvlInState/nvlClearSeq (shared across Node-RED tabs)."""
+import json
+import shutil
+from datetime import datetime
+
+path = "/srv/docker-volumes/config/nodered/data/flows.json"
+backup = path + ".bak-global-nvl-" + datetime.now().strftime("%Y%m%d-%H%M%S")
+shutil.copy2(path, backup)
+print("backup:", backup)
+
+with open(path) as f:
+    flows = json.load(f)
+
+replacements = [
+    ("flow.get('nvlInState')", "global.get('nvlInState')"),
+    ('flow.get("nvlInState")', 'global.get("nvlInState")'),
+    ("flow.set('nvlInState'", "global.set('nvlInState'"),
+    ('flow.set("nvlInState"', 'global.set("nvlInState"'),
+    ("flow.get('nvlClearSeq')", "global.get('nvlClearSeq')"),
+    ("flow.set('nvlClearSeq'", "global.set('nvlClearSeq'"),
+]
+
+count = 0
+for n in flows:
+    fn = n.get("func")
+    if not fn:
+        continue
+    original = fn
+    for old, new in replacements:
+        fn = fn.replace(old, new)
+    if fn != original:
+        n["func"] = fn
+        count += 1
+        print("patched", n.get("id"), n.get("name"))
+
+with open(path, "w") as f:
+    json.dump(flows, f)
+
+print("patched nodes:", count, "done")