feat(vehicle): add low power mode and keep accessory power signed commands

docs/fleet_api_signed_commands.md

@@ -244,3 +244,35 @@ async def main():
 
 asyncio.run(main())
 ```
+
+## Low Power / Keep Accessory Power Modes
+
+These are signed-only commands with no Fleet API REST equivalent. `set_low_power_mode` reduces standby power consumption while the vehicle is parked, and `set_keep_accessory_power_mode` keeps 12V accessory power available while parked. Both take a single `bool` to turn the mode on or off:
+
+```python
+import asyncio
+import aiohttp
+from tesla_fleet_api import TeslaFleetApi
+from tesla_fleet_api.tesla.vehicle.signed import VehicleSigned
+from tesla_fleet_api.exceptions import TeslaFleetError
+
+async def main():
+    async with aiohttp.ClientSession() as session:
+        api = TeslaFleetApi(
+            access_token="<access_token>",
+            session=session,
+            region="na",
+        )
+
+        try:
+            vehicle = VehicleSigned(api, "<vin>")
+            await vehicle.handshake()
+            low_power_response = await vehicle.set_low_power_mode(True)
+            print(low_power_response)
+            accessory_power_response = await vehicle.set_keep_accessory_power_mode(True)
+            print(accessory_power_response)
+        except TeslaFleetError as e:
+            print(e)
+
+asyncio.run(main())
+```

proto/car_server.proto

@@ -137,6 +137,8 @@ message VehicleAction {
     StopLightShowAction stopLightShowAction = 116;
     StartLightShowAction startLightShowAction = 117;
     SetSuspensionLevelAction setSuspensionLevelAction = 118;
+    SetLowPowerModeAction setLowPowerModeAction = 130;
+    SetKeepAccessoryPowerModeAction setKeepAccessoryPowerModeAction = 138;
   }
 }
 
@@ -892,3 +894,11 @@ message SetSuspensionLevelAction {
 
   SuspensionLevel suspension_level = 1;
 }
+
+message SetLowPowerModeAction {
+  bool low_power_mode = 1;
+}
+
+message SetKeepAccessoryPowerModeAction {
+  bool keep_accessory_power_mode = 1;
+}

tesla_fleet_api/tesla/vehicle/commands.py

@@ -161,6 +161,9 @@
     NavigationGpsDestinationRequest,
     # Group 11: Admin
     VehicleControlResetPinToDriveAdminAction,
+    # Group 12: Power modes
+    SetLowPowerModeAction,
+    SetKeepAccessoryPowerModeAction,
 )
 from tesla_fleet_api.tesla.vehicle.proto.vehicle_pb2 import (
     VehicleData,
@@ -1293,6 +1296,28 @@ async def set_cop_temp(
             )
         )
 
+    async def set_keep_accessory_power_mode(self, on: bool) -> dict[str, Any]:
+        """Turns Keep Accessory Power mode on and off, keeping 12V accessory power available while the vehicle is parked."""
+        return await self._sendInfotainment(
+            Action(
+                vehicleAction=VehicleAction(
+                    setKeepAccessoryPowerModeAction=SetKeepAccessoryPowerModeAction(
+                        keep_accessory_power_mode=on
+                    )
+                )
+            )
+        )
+
+    async def set_low_power_mode(self, on: bool) -> dict[str, Any]:
+        """Turns Low Power mode on and off, reducing standby power consumption while the vehicle is parked."""
+        return await self._sendInfotainment(
+            Action(
+                vehicleAction=VehicleAction(
+                    setLowPowerModeAction=SetLowPowerModeAction(low_power_mode=on)
+                )
+            )
+        )
+
     async def set_pin_to_drive(self, on: bool, password: str | int) -> dict[str, Any]:
         """Sets a four-digit passcode for PIN to Drive. This PIN must then be entered before the vehicle can be driven."""
         return await self._sendInfotainment(