Sending updates to external screen + RGB LCD

orchestrateur/external_display_manager.py

@@ -14,6 +14,7 @@ class DisplayManager:
         self.screens: Dict[str, str] = {}  # Map: service_name -> URL
         self.aiozc: AsyncZeroconf | None = None
         self.browser: AsyncServiceBrowser | None = None
+        self._on_screens_change_callback = None  # Callback for screen changes
 
     async def start(self):
         """Starts dynamic mDNS discovery for e-Paper screens."""
@@ -48,12 +49,20 @@ class DisplayManager:
                     url = f"http://{ip_str}:{port}{self.endpoint_path}"
                     
                     self.screens[name] = url
+                    if self._on_screens_change_callback:
+                        self._on_screens_change_callback(self.screens)
                     print(f"[DisplayManager] 📺 Screen registered: {name} -> {url}")
 
         elif state_change == ServiceStateChange.Removed:
             if name in self.screens:
                 print(f"[DisplayManager] ❌ Screen disconnected: {name}")
                 self.screens.pop(name, None)
+                if self._on_screens_change_callback:
+                    self._on_screens_change_callback(self.screens)
+                    
+    def set_on_screens_change_callback(self, callback):
+        """Set a callback function to be called when screens are added or removed."""
+        self._on_screens_change_callback = callback
 
     async def broadcast_state(self, microwave_states: dict, cloud_alert: bool):
         """Broadcasts the system state JSON to all discovered screens concurrently."""
@@ -113,9 +122,9 @@ class DisplayManager:
                 timeout=3.0
             )
             response.raise_for_status()
-            print(f"[DisplayManager] ✅ Updated {name}")
+            print(f"[DisplayManager] Updated {name}")
         except Exception as e:
-            print(f"[DisplayManager] ⚠️ Error pushing state to {name}: {e}")
+            print(f"[DisplayManager] Error pushing state to {name}: {e}")
 
     async def stop(self):
         """Clean up mDNS browser and Zeroconf instance."""