Cover fake position persistent (#213)

* Introduced read/store to JSON file of cover's last position for fake positioning
* renamed "fake" positioning to "timed"; introduced timed movement timeout equal to full opening time
* Made waiting for timeout for stopping non-blocking
* Introduced status storing using RestoreEntity
* Fixed postlund's remarks
* Updated cover samples in README and info.md

custom_components/localtuya/common.py

@@ -15,7 +15,7 @@ from homeassistant.helpers.dispatcher import (
     async_dispatcher_connect,
     async_dispatcher_send,
 )
-from homeassistant.helpers.entity import Entity
+from homeassistant.helpers.restore_state import RestoreEntity
 
 from . import pytuya
 from .const import (
@@ -209,7 +209,7 @@ class TuyaDevice(pytuya.TuyaListener, pytuya.ContextualLogger):
         self.debug("Disconnected - waiting for discovery broadcast")
 
 
-class LocalTuyaEntity(Entity, pytuya.ContextualLogger):
+class LocalTuyaEntity(RestoreEntity, pytuya.ContextualLogger):
     """Representation of a Tuya entity."""
 
     def __init__(self, device, config_entry, dp_id, logger, **kwargs):
@@ -228,6 +228,10 @@ class LocalTuyaEntity(Entity, pytuya.ContextualLogger):
 
         self.debug("Adding %s with configuration: %s", self.entity_id, self._config)
 
+        state = await self.async_get_last_state()
+        if state:
+            self.status_restored(state)
+
         def _update_handler(status):
             """Update entity state when status was updated."""
             if status is not None:
@@ -314,3 +318,9 @@ class LocalTuyaEntity(Entity, pytuya.ContextualLogger):
 
         Override in subclasses and update entity specific state.
         """
+
+    def status_restored(self, stored_state):
+        """Device status was restored.
+
+        Override in subclasses and update entity specific state.
+        """