feat(devices): skip realtime requests when device offline

talkingq-url/services/connection_manager.py

@@ -12,15 +12,23 @@ class ConnectionManager:
         async with self.lock:
             self.connections[device_id] = websocket
 
-    async def remove_connection(self, device_id: str):
+    async def remove_connection(self, device_id: str, websocket: Optional[WebSocket] = None):
         async with self.lock:
-            if device_id in self.connections:
+            if device_id in self.connections and (websocket is None or self.connections[device_id] is websocket):
                 del self.connections[device_id]
 
     async def get_connection(self, device_id: str) -> Optional[WebSocket]:
         async with self.lock:
             return self.connections.get(device_id)
 
+    async def is_connected(self, device_id: str) -> bool:
+        websocket = await self.get_connection(device_id)
+        return (
+            websocket is not None
+            and getattr(getattr(websocket, "client_state", None), "name", None) == "CONNECTED"
+            and not getattr(websocket, "_closed", False)
+        )
+
     async def get_all_connections(self) -> Dict[str, WebSocket]:
         async with self.lock:
             return dict(self.connections)