feat(lock): add Quick Key support for Lock Ultra

Expose the Lock Ultra "Quick Key" setting. All three of its settings live in a
single config byte: get_quick_key() reads and parses it, set_quick_key() does a
masked write of any subset of enabled / single-vs-double press / function
(Lock & Unlock, Unlock Only, Lock Only). Adds a QuickKeyFunction enum and unit
tests. Scoped to LOCK_ULTRA (other lock models are untested). Tested on a SwitchBot
Lock Ultra (firmware V2.6).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: mayerwin

switchbot/const/lock.py

@@ -12,3 +12,14 @@ class LockStatus(Enum):
     UNLOCKING_STOP = 5  # UNLOCKING_BLOCKED
     NOT_FULLY_LOCKED = 6  # LATCH_LOCKED - Only EU lock type
     HALF_LOCKED = 7  # Only Lock2 EU lock type
+
+
+class QuickKeyFunction(Enum):
+    """Action of the Lock Ultra Quick Key.
+
+    Value is the 2-bit function field of the Quick Key config byte. Lock Ultra.
+    """
+
+    LOCK_AND_UNLOCK = 0b10
+    UNLOCK_ONLY = 0b01
+    LOCK_ONLY = 0b00

switchbot/devices/lock.py

@@ -9,7 +9,7 @@
 from bleak.backends.device import BLEDevice
 
 from ..const import SwitchbotModel
-from ..const.lock import LockStatus
+from ..const.lock import LockStatus, QuickKeyFunction
 from .device import (
     SwitchbotEncryptedDevice,
     SwitchbotOperationError,
@@ -57,6 +57,22 @@
     SwitchbotModel.LOCK_ULTRA: f"{COMMAND_HEADER}0f4e0101000008",
 }
 
+# Quick Key — a Lock Ultra setting. All three of
+# its settings (enabled / single-vs-double press / function) live in a single config
+# byte: read it with 0x4f, masked-write it with 0x4e. Lock Ultra only (untested on
+# other lock models).
+COMMAND_GET_QUICK_KEY = {
+    SwitchbotModel.LOCK_ULTRA: f"{COMMAND_HEADER}0f4f0401",
+}
+# Append "<mask><value>ff" (each one hex byte) for a masked write.
+COMMAND_SET_QUICK_KEY_PREFIX = {
+    SwitchbotModel.LOCK_ULTRA: f"{COMMAND_HEADER}0f4e040100",
+}
+# Quick Key config-byte layout (the high bits 0xC0 are constant status flags).
+QUICK_KEY_ENABLED_BIT = 0x08
+QUICK_KEY_DOUBLE_PRESS_BIT = 0x04
+QUICK_KEY_FUNCTION_MASK = 0x03
+
 COMMAND_ENABLE_NOTIFICATIONS = {
     SwitchbotModel.LOCK: f"{COMMAND_HEADER}0e01001e00008101",
     SwitchbotModel.LOCK_LITE: f"{COMMAND_HEADER}0e01001e00008101",
@@ -141,6 +157,71 @@ async def half_lock(self) -> bool:
             {LockStatus.HALF_LOCKED, LockStatus.LOCKING},
         )
 
+    async def get_quick_key(self) -> dict[str, Any] | None:
+        """Return the Quick Key settings (Lock Ultra only).
+
+        Returns
+        ``{"enabled": bool, "double_press": bool, "function": QuickKeyFunction}``,
+        or ``None`` if it can't be read.
+        """
+        if self._model not in COMMAND_GET_QUICK_KEY:
+            raise SwitchbotOperationError(f"Quick Key is not supported on {self._model}")
+        result = await self._send_command(
+            key=COMMAND_GET_QUICK_KEY[self._model], retry=self._retry_count
+        )
+        if not self._check_command_result(result, 0, COMMAND_RESULT_EXPECTED_VALUES):
+            _LOGGER.error("Failed to read Quick Key settings")
+            return None
+        if len(result) < 2:
+            _LOGGER.error("Invalid Quick Key response: %s", result)
+            return None
+        return self._parse_quick_key(result[1])
+
+    @staticmethod
+    def _parse_quick_key(cfg: int) -> dict[str, Any]:
+        """Parse the Quick Key config byte."""
+        return {
+            "enabled": bool(cfg & QUICK_KEY_ENABLED_BIT),
+            "double_press": bool(cfg & QUICK_KEY_DOUBLE_PRESS_BIT),
+            "function": QuickKeyFunction(cfg & QUICK_KEY_FUNCTION_MASK),
+        }
+
+    async def set_quick_key(
+        self,
+        *,
+        enabled: bool | None = None,
+        double_press: bool | None = None,
+        function: QuickKeyFunction | None = None,
+    ) -> bool:
+        """Update one or more Quick Key settings (Lock Ultra only).
+
+        Only the fields you pass are changed (a masked write); the others keep their
+        current value. Returns ``True`` if the lock acknowledges with the requested
+        bits set.
+        """
+        if self._model not in COMMAND_SET_QUICK_KEY_PREFIX:
+            raise SwitchbotOperationError(f"Quick Key is not supported on {self._model}")
+        mask = 0
+        value = 0
+        if enabled is not None:
+            mask |= QUICK_KEY_ENABLED_BIT
+            value |= QUICK_KEY_ENABLED_BIT if enabled else 0
+        if double_press is not None:
+            mask |= QUICK_KEY_DOUBLE_PRESS_BIT
+            value |= QUICK_KEY_DOUBLE_PRESS_BIT if double_press else 0
+        if function is not None:
+            mask |= QUICK_KEY_FUNCTION_MASK
+            value |= function.value
+        if not mask:
+            raise ValueError("set_quick_key requires at least one setting to change")
+        command = f"{COMMAND_SET_QUICK_KEY_PREFIX[self._model]}{mask:02x}{value:02x}ff"
+        result = await self._send_command(key=command, retry=self._retry_count)
+        if not self._check_command_result(result, 0, COMMAND_RESULT_EXPECTED_VALUES):
+            _LOGGER.error("Failed to set Quick Key settings")
+            return False
+        # The lock echoes the resulting config byte; confirm our bits stuck.
+        return len(result) >= 2 and (result[1] & mask) == (value & mask)
+
     def _parse_basic_data(self, basic_data: bytes) -> dict[str, Any]:
         """Parse basic data from lock."""
         return {

tests/test_lock.py

@@ -4,7 +4,7 @@
 import pytest
 
 from switchbot import SwitchbotModel
-from switchbot.const.lock import LockStatus
+from switchbot.const.lock import LockStatus, QuickKeyFunction
 from switchbot.devices import lock
 from switchbot.devices.device import SwitchbotOperationError
 
@@ -862,3 +862,78 @@ async def test_lock_with_invalid_basic_data(model: str):
     ):
         result = await device.lock()
         assert result is True
+
+
+@pytest.mark.asyncio
+async def test_get_quick_key():
+    """Reading the Quick Key parses the config byte (Lock Ultra)."""
+    device = create_device_for_command_testing(SwitchbotModel.LOCK_ULTRA)
+    # 0xca = enabled, single press, Lock & Unlock
+    with patch.object(
+        device, "_send_command", return_value=b"\x01\xca\x00\x00\x00\x80"
+    ) as mock_send_command:
+        result = await device.get_quick_key()
+    mock_send_command.assert_any_call(
+        key=lock.COMMAND_GET_QUICK_KEY[SwitchbotModel.LOCK_ULTRA],
+        retry=device._retry_count,
+    )
+    assert result == {
+        "enabled": True,
+        "double_press": False,
+        "function": QuickKeyFunction.LOCK_AND_UNLOCK,
+    }
+
+
+@pytest.mark.asyncio
+async def test_get_quick_key_failure():
+    """A non-success status returns None."""
+    device = create_device_for_command_testing(SwitchbotModel.LOCK_ULTRA)
+    with patch.object(device, "_send_command", return_value=b"\x00"):
+        assert await device.get_quick_key() is None
+
+
+@pytest.mark.asyncio
+async def test_set_quick_key_masked_write():
+    """Setting only the function sends a masked write of just those bits."""
+    device = create_device_for_command_testing(SwitchbotModel.LOCK_ULTRA)
+    with patch.object(
+        device, "_send_command", return_value=b"\x01\xc9"  # echo 0xc9 = Unlock Only
+    ) as mock_send_command:
+        result = await device.set_quick_key(function=QuickKeyFunction.UNLOCK_ONLY)
+    prefix = lock.COMMAND_SET_QUICK_KEY_PREFIX[SwitchbotModel.LOCK_ULTRA]
+    mock_send_command.assert_any_call(key=f"{prefix}0301ff", retry=device._retry_count)
+    assert result is True
+
+
+@pytest.mark.asyncio
+async def test_set_quick_key_multiple_fields():
+    """Multiple fields combine into one mask/value pair."""
+    device = create_device_for_command_testing(SwitchbotModel.LOCK_ULTRA)
+    with patch.object(
+        device, "_send_command", return_value=b"\x01\xce"
+    ) as mock_send_command:
+        result = await device.set_quick_key(
+            enabled=True, double_press=True, function=QuickKeyFunction.LOCK_AND_UNLOCK
+        )
+    prefix = lock.COMMAND_SET_QUICK_KEY_PREFIX[SwitchbotModel.LOCK_ULTRA]
+    # mask = 0x08|0x04|0x03 = 0x0f ; value = 0x08|0x04|0x02 = 0x0e
+    mock_send_command.assert_any_call(key=f"{prefix}0f0eff", retry=device._retry_count)
+    assert result is True
+
+
+@pytest.mark.asyncio
+async def test_set_quick_key_requires_a_field():
+    """Calling with nothing to change raises ValueError."""
+    device = create_device_for_command_testing(SwitchbotModel.LOCK_ULTRA)
+    with pytest.raises(ValueError, match="at least one setting"):
+        await device.set_quick_key()
+
+
+@pytest.mark.asyncio
+async def test_quick_key_unsupported_model():
+    """Quick Key is Lock Ultra only; other models raise."""
+    device = create_device_for_command_testing(SwitchbotModel.LOCK)
+    with pytest.raises(SwitchbotOperationError):
+        await device.get_quick_key()
+    with pytest.raises(SwitchbotOperationError):
+        await device.set_quick_key(enabled=True)