feat (light): allow turning on by effect if no other way

We allow lights to be turned off by effect, but to turn such lights on,
the effect needs to be explicitly provided. Allow a default effect to
turn the light on without parameters.

custom_components/tuya_local/light.py

@@ -511,7 +511,11 @@ class TuyaLocalLight(TuyaLocalEntity, LightEntity):
                 settings = settings | self._switch_dps.get_values_to_set(
                     self._device, True, settings
                 )
-        elif self._brightness_dps and not self.is_on:
+        elif (
+            self._brightness_dps
+            and not self.is_on
+            and self._brightness_dps.id not in settings
+        ):
             bright = 255
             r = self._brightness_dps.range(self._device)
             if r:
@@ -524,7 +528,21 @@ class TuyaLocalLight(TuyaLocalEntity, LightEntity):
             settings = settings | self._brightness_dps.get_values_to_set(
                 self._device, bright, settings
             )
-
+        elif (
+            self._effect_dps
+            and not self.is_on
+            and "off" in self._effect_dps.values(self._device)
+            and self._effect_dps.id not in settings
+        ):
+            # Special case for lights with effect that has off state, but no switch or brightness
+            _LOGGER.info("%s turning light on using effect", self._config.config_id)
+            on_value = self._effect_dps.default
+            if on_value is None and "on" in self._effect_dps.values(self._device):
+                on_value = "on"
+            if on_value:
+                settings = settings | self._effect_dps.get_values_to_set(
+                    self._device, on_value, settings
+                )
         if settings:
             await self._device.async_set_properties(settings)