Remove sync interface, add asyncio discovery (#14)

* do not update inside __repr__

* Convert discovery to asyncio

* Use asyncio.DatagramProtocol
* Cleanup parameters, no more positional arguments

Closes #7

* Remove sync interface

* This requires #13 to be merged. Closes #12.
* Converts cli to use asyncio.run() where needed.
* The children from smartstrips is being initialized during the first update call.

* Convert on and off commands to use asyncio.run

* conftest: do the initial update automatically for the device, cleans up tests a bit

* return subdevices alias for strip plugs, remove sync from docstrings

* Make tests pass using pytest-asyncio

* Simplify tests and use pytest-asyncio.
* Removed the emeter tests for child devices, as this information do not seem to exist (based on the dummy sysinfo data). Can be added again if needed.
* Remove sync from docstrings.

* Fix incorrect type hint

* Add type hints and some docstrings to discovery

kasa/smartdevice.py

@@ -138,7 +138,6 @@ class SmartDevice:
         self.cache = defaultdict(lambda: defaultdict(lambda: None))  # type: ignore
         self._device_type = DeviceType.Unknown
         self.ioloop = ioloop or asyncio.get_event_loop()
-        self.sync = SyncSmartDevice(self, ioloop=self.ioloop)
         self._sys_info = None
 
     def _result_from_cache(self, target, cmd) -> Optional[Dict]:
@@ -646,14 +645,13 @@ class SmartDevice:
         return False
 
     def __repr__(self):
-        self.sync.update()
         return "<{} model {} at {} ({}), is_on: {} - dev specific: {}>".format(
             self.__class__.__name__,
             self.model,
             self.host,
             self.alias,
             self.is_on,
-            self.sync.state_information,
+            self.state_information,
         )