Get updated attribute values

Make sure to get the attribute values again after each command to get
the updated attribute cache.

src/controller/python/test/test_scripts/cluster_objects.py

@@ -216,12 +216,12 @@ def subUpdate(path: TypedAttributePath, transaction: SubscriptionTransaction):
         sub.SetAttributeUpdateCallback(subUpdate)
 
         try:
-            data = sub.GetAttributes()
             req = Clusters.OnOff.Commands.On()
             await devCtrl.SendCommand(nodeid=NODE_ID, endpoint=1, payload=req)
 
             await asyncio.wait_for(event.wait(), timeout=11)
 
+            data = sub.GetAttributes()
             if (data[1][Clusters.OnOff][Clusters.OnOff.Attributes.OnOff] != 1):
                 raise ValueError("Current On/Off state should be 1")
 
@@ -232,6 +232,7 @@ def subUpdate(path: TypedAttributePath, transaction: SubscriptionTransaction):
 
             await asyncio.wait_for(event.wait(), timeout=11)
 
+            data = sub.GetAttributes()
             if (data[1][Clusters.OnOff][Clusters.OnOff.Attributes.OnOff] != 0):
                 raise ValueError("Current On/Off state should be 0")