Refactor devices into subpackages and deprecate old names (#716)

* Refactor devices into subpackages and deprecate old names

* Tweak and add tests

* Fix linting

* Remove duplicate implementations affecting project coverage

* Update post review

* Add device base class attributes and rename subclasses

* Rename Module to BaseModule

* Remove has_emeter_history

* Fix missing _time in init

* Update post review

* Fix test_readmeexamples

* Fix erroneously duped files

* Clean up iot and smart imports

* Update post latest review

* Tweak Device docstring

kasa/smart/smartchilddevice.py

@@ -0,0 +1,41 @@
+"""Child device implementation."""
+from typing import Optional
+
+from ..device_type import DeviceType
+from ..deviceconfig import DeviceConfig
+from ..smartprotocol import SmartProtocol, _ChildProtocolWrapper
+from .smartdevice import SmartDevice
+
+
+class SmartChildDevice(SmartDevice):
+    """Presentation of a child device.
+
+    This wraps the protocol communications and sets internal data for the child.
+    """
+
+    def __init__(
+        self,
+        parent: SmartDevice,
+        child_id: str,
+        config: Optional[DeviceConfig] = None,
+        protocol: Optional[SmartProtocol] = None,
+    ) -> None:
+        super().__init__(parent.host, config=parent.config, protocol=parent.protocol)
+        self._parent = parent
+        self._id = child_id
+        self.protocol = _ChildProtocolWrapper(child_id, parent.protocol)
+        # TODO: remove the assignment after modularization is done,
+        #  currently required to allow accessing time-related properties
+        self._time = parent._time
+        self._device_type = DeviceType.StripSocket
+
+    async def update(self, update_children: bool = True):
+        """Noop update. The parent updates our internals."""
+
+    def update_internal_state(self, info):
+        """Set internal state for the child."""
+        # TODO: cleanup the _last_update, _sys_info, _info, _data mess.
+        self._last_update = self._sys_info = self._info = info
+
+    def __repr__(self):
+        return f"<ChildDevice {self.alias} of {self._parent}>"