Update hub children on first update and delay subsequent updates (#1438)

kasa/smart/smartchilddevice.py

@@ -86,11 +86,22 @@ class SmartChildDevice(SmartDevice):
         module_queries: list[SmartModule] = []
         req: dict[str, Any] = {}
         for module in self.modules.values():
-            if module.disabled is False and (mod_query := module.query()):
+            if (
+                module.disabled is False
+                and (mod_query := module.query())
+                and module._should_update(now)
+            ):
                 module_queries.append(module)
                 req.update(mod_query)
         if req:
-            self._last_update = await self.protocol.query(req)
+            first_update = self._last_update != {}
+            try:
+                resp = await self.protocol.query(req)
+            except Exception as ex:
+                resp = await self._handle_modular_update_error(
+                    ex, first_update, ", ".join(mod.name for mod in module_queries), req
+                )
+            self._last_update = resp
 
         for module in self.modules.values():
             await self._handle_module_post_update(