Add Elexa Guardian docs (#13150)

source/_integrations/guardian.markdown

@@ -0,0 +1,57 @@
+---
+title: Guardian
+description: Instructions on how to integrate SimpliSafe into Home Assistant.
+ha_release: "0.111"
+ha_category:
+  - Binary Sensor
+  - Sensor
+  - Switch
+ha_config_flow: true
+ha_codeowners:
+  - '@bachya'
+ha_domain: guardian
+---
+
+The `guardian` integration integrates
+[Elexa Guardian water valve controllers](https://getguardian.com) into Home Assistant.
+
+There is currently support for the following device types within Home Assistant:
+
+- **Binary Sensor**: reports the status of the onboard leak detector and access point
+- **Sensor**: reports on the device's detected temperature and uptime
+- **Switch**: allows the user to open and close the valve
+
+## Configuration
+
+This integration can be configured via the Home Assistant UI by navigating to
+**Configuration** -> **Integrations**. If you have the `zeroconf` integration enabled,
+Home Assistant will automatically discover any Guardian devices already connected to the
+network.
+
+## Services
+
+### `guardian.disable_ap`
+
+Disable the device's onboard access point.
+
+### `guardian.enable_ap`
+
+Enable the device's onboard access point.
+
+### `guardian.reboot`
+
+Reboot the device.
+
+### `guardian.reset_valve_diagnostics`
+
+Fully (and irrecoverably) reset all valve diagnostics.
+
+### `guardian.upgrade_firmware`
+
+Upgrade the device firmware.
+
+| Service Data Attribute | Optional | Description                                      |
+| ---------------------- | -------- | ------------------------------------------------ |
+| `url`                    | yes      | The URL of the server hosting the firmware file. |
+| `port`                   | yes      | The port on which the firmware file is served.   |
+| `filename`               | yes      | The firmware filename.                           |