Device support for the chuangmi plug v1 added (#33)

* Device support for the chuangmi plug v1 strip added.

* Status class moved.

* Missing import added.

mirobo/__init__.py

@@ -3,6 +3,7 @@
 from mirobo.vacuumcontainers import VacuumStatus, ConsumableStatus, CleaningDetails, CleaningSummary, Timer
 from mirobo.vacuum import Vacuum, VacuumException
 from mirobo.plug import Plug
+from mirobo.plug_v1 import PlugV1
 from mirobo.airpurifier import AirPurifier
 from mirobo.strip import Strip
 from mirobo.device import Device, DeviceException

mirobo/plug_v1.py

@@ -0,0 +1,55 @@
+from .device import Device
+from typing import Any, Dict
+
+
+class PlugV1(Device):
+    """Main class representing the chuangmi plug v1."""
+
+    def on(self):
+        """Power on."""
+        return self.send("set_on", [])
+
+    def off(self):
+        """Power off."""
+        return self.send("set_off", [])
+
+    def usb_on(self):
+        """Power on."""
+        return self.send("set_usb_on", [])
+
+    def usb_off(self):
+        """Power off."""
+        return self.send("set_usb_off", [])
+
+    def status(self):
+        """Retrieve properties."""
+        properties = ['on', 'usb_on']
+        values = self.send(
+            "get_prop",
+            properties
+        )
+        return PlugV1Status(dict(zip(properties, values)))
+
+
+class PlugV1Status:
+    """Container for status reports from the plug."""
+    def __init__(self, data: Dict[str, Any]) -> None:
+        self.data = data
+
+    @property
+    def power(self) -> bool:
+        return self.data["on"]
+
+    @property
+    def is_on(self) -> bool:
+        return self.power
+
+    @property
+    def usb_power(self) -> bool:
+        return self.data["usb_on"]
+
+    def __str__(self) -> str:
+        s = "<PlugV1Status power=%s, usb_power=%s>" % \
+            (self.power,
+             self.usb_power)
+        return s