Keep connection open and lock to prevent duplicate requests (#213)

* Keep connection open and lock to prevent duplicate requests

* option to not update children

* tweaks

* typing

* tweaks

* run tests in the same event loop

* memorize model

* Update kasa/protocol.py

Co-authored-by: Teemu R. <tpr@iki.fi>

* Update kasa/protocol.py

Co-authored-by: Teemu R. <tpr@iki.fi>

* Update kasa/protocol.py

Co-authored-by: Teemu R. <tpr@iki.fi>

* Update kasa/protocol.py

Co-authored-by: Teemu R. <tpr@iki.fi>

* dry

* tweaks

* warn when the event loop gets switched out from under us

* raise on unable to connect multiple times

* fix patch target

* tweaks

* isrot

* reconnect test

* prune

* fix mocking

* fix mocking

* fix test under python 3.7

* fix test under python 3.7

* less patching

* isort

* use mocker to patch

* disable on old python since mocking doesnt work

* avoid disconnect/reconnect cycles

* isort

* Fix hue validation

* Fix latitude_i/longitude_i units

Co-authored-by: Teemu R. <tpr@iki.fi>

kasa/smartstrip.py

@@ -87,12 +87,12 @@ class SmartStrip(SmartDevice):
         """Return if any of the outlets are on."""
         return any(plug.is_on for plug in self.children)
 
-    async def update(self):
+    async def update(self, update_children: bool = True):
         """Update some of the attributes.
 
         Needed for methods that are decorated with `requires_update`.
         """
-        await super().update()
+        await super().update(update_children)
 
         # Initialize the child devices during the first update.
         if not self.children:
@@ -103,7 +103,7 @@ class SmartStrip(SmartDevice):
                     SmartStripPlug(self.host, parent=self, child_id=child["id"])
                 )
 
-        if self.has_emeter:
+        if update_children and self.has_emeter:
             for plug in self.children:
                 await plug.update()
 
@@ -243,13 +243,13 @@ class SmartStripPlug(SmartPlug):
         self._sys_info = parent._sys_info
         self._device_type = DeviceType.StripSocket
 
-    async def update(self):
+    async def update(self, update_children: bool = True):
         """Query the device to update the data.
 
         Needed for properties that are decorated with `requires_update`.
         """
         self._last_update = await self.parent.protocol.query(
-            self.host, self._create_emeter_request()
+            self._create_emeter_request()
         )
 
     def _create_request(