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tuya-device-handlers

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# Tuya quirks library

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[pypi_]: https://pypi.org/project/tuya-device-handlers/
[python version]: https://pypi.org/project/tuya-device-handlers
[tests]: https://github.com/home-assistant-libs/tuya-device-handlers/actions?workflow=Tests
[codecov]: https://app.codecov.io/gh/home-assistant-libs/tuya-device-handlers
[scorecard]: https://scorecard.dev/viewer/?uri=github.com/home-assistant-libs/tuya-device-handlers
[scorecard-shield]: https://api.scorecard.dev/projects/github.com/home-assistant-libs/tuya-device-handlers/badge
[devcontainer]: https://vscode.dev/redirect?url=vscode://ms-vscode-remote.remote-containers/cloneInVolume?url=https://github.com/home-assistant-libs/tuya-device-handlers
[devcontainer-shield]: https://img.shields.io/static/v1?label=Dev%20Containers&message=Open&color=blue&logo=visualstudiocode
[pre-commit]: https://github.com/pre-commit/pre-commit
[ruff]: https://github.com/astral-sh/ruff

## What is this?

`tuya-device-handlers` is a "quirks" library used by Home Assistant's [Tuya integration][ha-tuya] to fix or normalise misbehaving Tuya devices. A quirk is matched against a device's `product_id` and patches its datapoints (function/status_range/local_strategy) before Home Assistant builds entities from them.

The library is shipped to end users via Home Assistant — you do not install it directly.

## Writing a quirk

### 1. Find your device's `product_id` and datapoints

In Home Assistant: **Settings → Devices & services → Tuya → your device → Download diagnostics**. The JSON contains the `product_id`, the cloud-reported `function` / `status_range` maps, and the current `status` values. Use these to decide what needs patching.

### 2. Create a quirk file

Drop a Python file into your Home Assistant config folder at `<config>/tuya_quirks/<category>_<product_id_lowercased>.py`. The `<category>` prefix follows Tuya's [official category codes][tuya-categories] (e.g. `cz` for plug/socket, `wk` for thermostat, `cl` for curtain).

Quirks are built using a fluent `DeviceQuirk` builder. Minimal example — redefine one datapoint and remove another:

```python
from tuya_device_handlers import TUYA_QUIRKS_REGISTRY
from tuya_device_handlers.builder import DeviceQuirk
from tuya_device_handlers.const import DPMode

(
    DeviceQuirk()
    .applies_to(product_id="abcdEFGHijkl1234")
    .add_dpid_integer(
        dpid=18,
        dpcode="cur_current",
        dpmode=DPMode.READ,
        unit="mA", min=0, max=30000, scale=0, step=1,
    )
    .remove_dpid(dpid=22, dpcode="phantom_dp")
    .register(TUYA_QUIRKS_REGISTRY)
)
```

Each quirk file should contain exactly one `DeviceQuirk()...register(...)` chain at module top level — the file path is captured for reload tracking. Available builder methods include `add_dpid_boolean`, `add_dpid_bitmap`, `add_dpid_enum`, `add_dpid_integer`, and `remove_dpid`. For more complex needs (custom value scaling, platform-specific definitions), see the in-tree examples under [`src/tuya_device_handlers/devices/`][devices-dir].

> **New to this and not a programmer?** For a fully worked, copy-paste walkthrough of one of the most common fixes — a device sending ENUM values (e.g. extra `mode` presets) that Home Assistant rejects as `Found invalid ENUM value ...` — see [Recipe: add missing ENUM values](docs/adding-missing-enum-values.md). It covers writing the quirk, testing it live, and opening a PR end to end.

### 3. Test it inside Home Assistant

1. Restart the Tuya integration (**Settings → Devices & services → Tuya → ⋮ → Reload**). Quirks under `<config>/tuya_quirks/` are reloaded each time, so you don't need to restart Home Assistant itself.
2. Watch the logs — you should see `Loading custom quirk module …` followed by `Loaded custom quirks. Please contribute them to https://github.com/home-assistant-libs/tuya-device-handlers`. If the import fails, the traceback is logged.
3. Verify the device's entities reflect your changes (download diagnostics again to confirm the patched function/status_range maps).

## Contributing your quirk

Once your quirk works, please open a pull request so other Home Assistant users benefit.

1. Fork and clone this repository, then run `poetry install`.
2. Move your quirk file from `<config>/tuya_quirks/` to `src/tuya_device_handlers/devices/<category>/`. The filename should match `<category>_<product_id_lowercased>.py`.
3. Add a device fixture JSON at `tests/fixtures/devices/<category>_<product_id>.json`. Build it from your Home Assistant diagnostics download: keep only the contents of the top-level `data` property (the captured device payload), then remove its `id`, `terminal_id`, and `home_assistant` keys. Name the file from the payload's own `category` and `product_id` fields. For example:

```console
   python3 -c "
   import json
   d = json.load(open('diagnostics.json'))['data']
   for k in ('id', 'terminal_id', 'home_assistant'):
       d.pop(k, None)
   name = f\"tests/fixtures/devices/{d['category']}_{d['product_id']}.json\"
   with open(name, 'w') as f:
       json.dump(d, f, indent=2, ensure_ascii=False)
       f.write('\n')
   print(name)
   "
   ```

4. Add a test under `tests/devices/<category>/` covering the patched behaviour.
5. Run the test suite locally:

```console
   poetry run pytest --cov tuya_device_handlers tests
   ```

6. Open a [pull request].

For broader contributor guidelines (issue reporting, dev setup, pre-commit hooks), see the [Contributor Guide].

## License

Distributed under the terms of the [MIT license][license],
_Tuya quirks library_ is free and open source software.

## Issues

If you encounter any problems,
please [file an issue] along with a detailed description.

[ha-tuya]: https://www.home-assistant.io/integrations/tuya/
[tuya-categories]: https://developer.tuya.com/en/docs/iot/standarddescription?id=K9i5ql6waswzq
[devices-dir]: https://github.com/home-assistant-libs/tuya-device-handlers/tree/main/src/tuya_device_handlers/devices
[file an issue]: https://github.com/home-assistant-libs/tuya-device-handlers/issues
[pull request]: https://github.com/home-assistant-libs/tuya-device-handlers/pulls

[license]: https://github.com/home-assistant-libs/tuya-device-handlers/blob/main/LICENSE
[contributor guide]: https://github.com/home-assistant-libs/tuya-device-handlers/blob/main/.github/CONTRIBUTING.md

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