Add supports_miot to device class (#1659)

This allows querying whether the device supports miot commands.

miio/device.py

@@ -16,7 +16,11 @@
 )
 from .deviceinfo import DeviceInfo
 from .devicestatus import DeviceStatus
-from .exceptions import DeviceInfoUnavailableException, PayloadDecodeException
+from .exceptions import (
+    DeviceError,
+    DeviceInfoUnavailableException,
+    PayloadDecodeException,
+)
 from .miioprotocol import MiIOProtocol
 
 _LOGGER = logging.getLogger(__name__)
@@ -298,5 +302,17 @@ def sensors(self) -> Dict[str, SensorDescriptor]:
         sensors = self.status().sensors()
         return sensors
 
+    def supports_miot(self) -> bool:
+        """Return True if the device supports miot commands.
+
+        This requests a single property (siid=1, piid=1) and returns True on success.
+        """
+        try:
+            self.send("get_properties", [{"did": "dummy", "siid": 1, "piid": 1}])
+        except DeviceError as ex:
+            _LOGGER.debug("miot query failed, likely non-miot device: %s", repr(ex))
+            return False
+        return True
+
     def __repr__(self):
         return f"<{self.__class__.__name__ }: {self.ip} (token: {self.token})>"

miio/tests/test_device.py

@@ -169,3 +169,16 @@ def test_init_signature(cls, mocker):
     # as some arguments are passed by inheriting classes using kwargs
     total_args = len(parent_init.call_args.args) + len(parent_init.call_args.kwargs)
     assert total_args == 8
+
+
+def test_supports_miot(mocker):
+    from miio.exceptions import DeviceError
+
+    send = mocker.patch(
+        "miio.Device.send", side_effect=DeviceError({"code": 1, "message": 1})
+    )
+    d = Device("127.0.0.1", "68ffffffffffffffffffffffffffffff")
+    assert d.supports_miot() is False
+
+    send.side_effect = None
+    assert d.supports_miot() is True