viomi: add ability to change the mopping pattern (#744)

* mop_mode command allows now changing between S and Y patterns
* old mop_mode command has been renamed to clean_mode which is more suitable name

Fixes #725

miio/viomivacuum.py

@@ -100,6 +100,13 @@ class ViomiWaterGrade(Enum):
     High = 13
 
 
+class ViomiMopMode(Enum):
+    """Mopping pattern."""
+
+    S = 0
+    Y = 1
+
+
 class ViomiVacuumStatus:
     def __init__(self, data):
         # ["run_state","mode","err_state","battary_life","box_type","mop_type","s_time","s_area",
@@ -293,10 +300,14 @@ def move(self, direction, duration=0.5):
         self.send("set_direction", [ViomiMovementDirection.Stop.value])
 
     @command(click.argument("mode", type=EnumType(ViomiMode, False)))
-    def mop_mode(self, mode):
-        """Set mopping mode."""
+    def clean_mode(self, mode):
+        """Set the cleaning mode."""
         self.send("set_mop", [mode.value])
 
+    @command(click.argument("mop_mode", type=EnumType(ViomiMopMode, False)))
+    def mop_mode(self, mop_mode):
+        self.send("set_moproute", [mop_mode.value])
+
     @command()
     def dnd_status(self):
         """Returns do-not-disturb status."""