Add Gledopto GL-SD-301P (#3127)

* Add GL-SD-301P

* Add GL-SD-301P

docs/devices/GL-SD-301P.md

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+---
+title: "Gledopto GL-SD-301P control via MQTT"
+description: "Integrate your Gledopto GL-SD-301P via Zigbee2MQTT with whatever smart home infrastructure you are using without the vendor's bridge or gateway."
+addedAt: 2024-10-23T14:26:55Z
+pageClass: device-page
+---
+
+<!-- !!!! -->
+<!-- ATTENTION: This file is auto-generated through docgen! -->
+<!-- You can only edit the "Notes"-Section between the two comment lines "Notes BEGIN" and "Notes END". -->
+<!-- Do not use h1 or h2 heading within "## Notes"-Section. -->
+<!-- !!!! -->
+
+# Gledopto GL-SD-301P
+
+|     |     |
+|-----|-----|
+| Model | GL-SD-301P |
+| Vendor  | [Gledopto](/supported-devices/#v=Gledopto)  |
+| Description | Zigbee triac AC dimmer |
+| Exposes | light (state, brightness), effect, linkquality |
+| Picture | ![Gledopto GL-SD-301P](https://www.zigbee2mqtt.io/images/devices/GL-SD-301P.png) |
+
+
+<!-- Notes BEGIN: You can edit here. Add "## Notes" headline if not already present. -->
+## Notes
+
+
+### Pairing
+1. Switch on your device.
+2. Now switch off and on within 2 seconds.
+3. Repeat off/on four times.
+4. Reset is done when the device is switched on in the fifth time and the light stays on after blinking 4 times
+
+### Binding
+The device allows zigbee [binding](../guide/usage/binding.html).
+<!-- Notes END: Do not edit below this line -->
+
+## OTA updates
+
+This device supports OTA updates, for more information see [OTA updates](../guide/usage/ota_updates.md).
+
+## Options
+*[How to use device type specific configuration](../guide/configuration/devices-groups.md#specific-device-options)*
+
+* `transition`: Controls the transition time (in seconds) of on/off, brightness, color temperature (if applicable) and color (if applicable) changes. Defaults to `0` (no transition). The value must be a number with a minimum value of `0`
+
+* `state_action`: State actions will also be published as 'action' when true (default false). The value must be `true` or `false`
+
+
+## Exposes
+
+### Light 
+This light supports the following features: `state`, `brightness`.
+- `state`: To control the state publish a message to topic `zigbee2mqtt/FRIENDLY_NAME/set` with payload `{"state": "ON"}`, `{"state": "OFF"}` or `{"state": "TOGGLE"}`. To read the state send a message to `zigbee2mqtt/FRIENDLY_NAME/get` with payload `{"state": ""}`.
+- `brightness`: To control the brightness publish a message to topic `zigbee2mqtt/FRIENDLY_NAME/set` with payload `{"brightness": VALUE}` where `VALUE` is a number between `0` and `254`. To read the brightness send a message to `zigbee2mqtt/FRIENDLY_NAME/get` with payload `{"brightness": ""}`.
+
+#### Transition
+For all of the above mentioned features it is possible to do a transition of the value over time. To do this add an additional property `transition` to the payload which is the transition time in seconds.
+Examples: `{"brightness":156,"transition":3}`, `{"color_temp":241,"transition":1}`.
+
+#### Moving/stepping
+Instead of setting a value (e.g. brightness) directly it is also possible to:
+- move: this will automatically move the value over time, to stop send value `stop` or `0`.
+- step: this will increment/decrement the current value by the given one.
+
+The direction of move and step can be either up or down, provide a negative value to move/step down, a positive value to move/step up.
+To do this send a payload like below to `zigbee2mqtt/FRIENDLY_NAME/set`
+
+**NOTE**: brightness move/step will stop at the minimum brightness and won't turn on the light when it's off. In this case use `brightness_move_onoff`/`brightness_step_onoff`
+````js
+{
+  "brightness_move": -40, // Starts moving brightness down at 40 units per second
+  "brightness_move": 0, // Stop moving brightness
+  "brightness_step": 40 // Increases brightness by 40
+}
+````
+
+### Effect (enum)
+Triggers an effect on the light (e.g. make light blink for a few seconds).
+Value will **not** be published in the state.
+It's not possible to read (`/get`) this value.
+To write (`/set`) a value publish a message to topic `zigbee2mqtt/FRIENDLY_NAME/set` with payload `{"effect": NEW_VALUE}`.
+The possible values are: `blink`, `breathe`, `okay`, `channel_change`, `finish_effect`, `stop_effect`.
+
+### Linkquality (numeric)
+Link quality (signal strength).
+Value can be found in the published state on the `linkquality` property.
+It's not possible to read (`/get`) or write (`/set`) this value.
+The minimal value is `0` and the maximum value is `255`.
+The unit of this value is `lqi`.
+