LEVOIT OasisMist™ 4.5L (LUH-O451S-WEU) partially supported

[chemelli74]

Hi,

device works fine but unfortunately is only partially supported.
Missing features compared to the Vsync mobile app:

• Auto-off: this is a on/off switch
• Night light: this is a on/off switch
• Night light color: you can pick up any color in the RGB pallete
• Timer
• Schedules

Non working features:

• Night mode:
  2025-12-31 17:05:52.633 WARNING (MainThread) [pyvesync.devices.vesynchumidifier] OasisMist™ 4.5L for LUH-O451S-WEU API from set_humidity_mode returned error code: 11000000, message: request_error - Invalid bypass parameter - Mode value invaild! - Mode value invaild!

Here the response from from Home Assistant debug log:

Response Body:
 {
  "traceId": "1767196882",
  "code": 0,
  "msg": "request success",
  "module": null,
  "stacktrace": null,
  "result": {
    "traceId": "1767196882",
    "code": 0,
    "result": {
      "enabled": false,
      "mist_virtual_level": 9,
      "mist_level": 3,
      "mode": "auto",
      "water_lacks": false,
      "water_tank_lifted": false,
      "humidity": 38,
      "humidity_high": false,
      "display": false,
      "warm_enabled": false,
      "warm_level": 0,
      "automatic_stop_reach_target": false,
      "configuration": {
        "auto_target_humidity": 50,
        "display": false,
        "automatic_stop": true
      },
      "extension": {
        "schedule_count": 0,
        "timer_remain": 0
      },
      "rgbNightLight": {
        "action": "off",
        "colorMode": "color",
        "speed": 0,
        "brightness": 40,
        "red": 18,
        "green": 102,
        "blue": 1,
        "colorSliderLocation": 42
      }
    }
  }
}

[cdnninja]

The top section is mostly for the HA integration rather than the library. Do you have a drop down menu for the night light that can turn it on and off?

As for those other top ones, which do you intend to use? What do you find most value in?

[chemelli74]

Hi, thx for the very quick reply !

This is the device view in Home Assistant:

I would say to start with:

• Auto-off: this is a on/off switch
• Night light: this is a on/off switch
• Night light color: you can pick up any color in the RGB pallete

Thank you !

[cdnninja]

Night light will be a drop down menu since that is needed for other device and already exists. For some reason it doesn't expose for this one which is most likely a library issue. I have added this PR for auto off: home-assistant/core#160070 if you could test for your model that would be great! I have tested this on my 300.

[webdjoe]

Are you setting sleep mode with the set_humidity_mode?

The EU model is different from the US model, so I'll need capture packets to be able to add the functionality. You can follow the directions here https://webdjoe.github.io/pyvesync/latest/development/capturing/ or you can share the device temporarily with me so I can capture packets. Message me on discord and I'm happy to assist further homefire1608

[chemelli74]

Are you setting sleep mode with the set_humidity_mode?

The EU model is different from the US model, so I'll need capture packets to be able to add the functionality. You can follow the directions here https://webdjoe.github.io/pyvesync/latest/development/capturing/ or you can share the device temporarily with me so I can capture packets. Message me on discord and I'm happy to assist further homefire1608

Thx!

[cdnninja]

Set_mode:

https://github.com/home-assistant/core/blob/2b10dc454542abdc01de31330a3e09da221eebcd/homeassistant/components/vesync/humidifier.py#L158-L159

[chemelli74]

Night light will be a drop down menu since that is needed for other device and already exists.

I think it should be a light with on/off and RGB colors ;-)

For some reason it doesn't expose for this one which is most likely a library issue.

Is the node in my log the expecred one ? Didn't get time to investigate or debug myself.

I have added this PR for auto off: home-assistant/core#160070 if you could test for your model that would be great! I have tested this on my 300.

Thx, works perfectly !

[chemelli74]

Just noticed that #297 and #484 may apply here as well.

My device has manual, auto and warm (as an alternative to fog) settings.
No sleep.

[ro2342]

I confirm that I can't also use the light feature. It's a miss.

I'm using Home Assistant Container 2026.1.0

Device info
LUH-O451S-WEU
by VeSync

[webdjoe]

I am waiting on device captures, because this is different than the US model. If you want to help out, you can follow the directions here https://webdjoe.github.io/pyvesync/latest/development/capturing/ or you can share the device temporarily with me so I can capture packets. Message me on discord and I'm happy to assist further homefire1608