diff --git a/simulator.py b/simulator.py
index 1fea8648..a1191f08 100644
--- a/simulator.py
+++ b/simulator.py
@@ -519,7 +519,7 @@ def publish_orion(sid: str, sensor: dict) -> bool:
     try:
         body = json.dumps(entity).encode()
         req = urllib.request.Request(f"{base}/entities", data=body,
-                                    headers={"Content-Type": "application/ld+json", "Accept": "application/ld+json"}, method="POST")
+                                     headers={"Content-Type": "application/ld+json", "Accept": "application/ld+json"}, method="POST")
         with urllib.request.urlopen(req, timeout=8) as resp:
             print(f"  🌐 Orion-LD: ✅ (HTTP {resp.status} created)")
             return True
@@ -527,17 +527,19 @@ def publish_orion(sid: str, sensor: dict) -> bool:
         if e.code != 409:
             print(f"  ⚠️  Orion-LD → {e.code}: {e.read().decode()[:200]}")
             return False
-    # 2. Déjà existant (409) → PATCH sur les attributs
+    # 2. Déjà existant (409) → PATCH sur les attributs (sans id/type/@context)
     try:
+        # PATCH ne doit contenir que les attributs (pas id/type/@context)
+        attrs = {k: v for k, v in entity.items() if k not in ("id", "type", "@context")}
         eid = urllib.parse.quote(entity['id'], safe='')
         patch_url = f"{base}/entities/{eid}/attrs"
-        req2 = urllib.request.Request(patch_url, data=body,
+        req2 = urllib.request.Request(patch_url, data=json.dumps(attrs).encode(),
                                      headers={"Content-Type": "application/ld+json", "Accept": "application/ld+json"}, method="PATCH")
         with urllib.request.urlopen(req2, timeout=8) as resp2:
             print(f"  🌐 Orion-LD: ✅ (HTTP {resp2.status} updated)")
             return True
     except Exception as e2:
-        print(f"  ⚠️  Orion-LD → update failed: {e2}")
+        print(f"  ⚠️  Orion-LD PATCH failed: {e2}")
         return False
     except Exception as e:
         print(f"  ⚠️  Orion-LD → {e}")