Z-Wave MQTT Auto Discovery dimmers missing dim level / slider not working (solved)

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deprutser
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Z-Wave MQTT Auto Discovery dimmers missing dim level / slider not working (solved)

Post by deprutser »

Version: v2026.4 (Build 18581)
Platform: Raspberry Pi 5 (Raspbian Bookworm)
Plugin/Hardware: MQTT Auto Discovery Client Gateway (with Zwave-JS-UI)

Description:
After updating from Beta v2026.4 (Build 18556) to v2026.4 (Build 18581), Z-Wave dimmers integrated via MQTT Auto Discovery (Zwave-JS-UI) no longer update their dim level (level / %) visually in the user interface.
The slider remains stuck completely to the left (0%), and no percentage is shown next to the device, even though the device type is still configured as a "Dimmer" in the switch settings. I have already fully cleared my browser cache and tested in an incognito window, but the issue persists.
Behavior observed:
1. Outgoing control works: Moving the slider in Domoticz successfully sends out the correct MQTT command (Set Level) via the broker. The physical Z-Wave lamp actually dims to the selected value.
2. Incoming status updates fail: When the dimmer reports its status back to MQTT (e.g., {"value": 20, "state": "ON"}), Domoticz Build 18581 processes this update purely as a hard On or Off state. It completely ignores the incoming numerical value / dim level, so the slider and percentage text do not update.
Comparison / Regression proof:
I am running a secondary Pi with the previous Beta v2026.4 (Build 18556) connected to the exact same Zwave-JS-UI instance. On that build (18556), the sliders, statuses, and percentages still work flawlessly. The breakdown of the incoming Auto Discovery payload parsing is strictly isolated to the changes introduced between build 18556 and 18581.
Last edited by deprutser on Monday 02 November 2026 11:38, edited 1 time in total.
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gizmocuz
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Re: Z-Wave MQTT Auto Discovery dimmers missing dim level / slider not working

Post by gizmocuz »

Has been fixed, please check our github issues page before reporting here.
Also these things should be reported on github

Thanks for reporting!
Quality outlives Quantity!
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deprutser
Posts: 2
Joined: Saturday 31 October 2026 15:20
Target OS: Raspberry Pi / ODroid
Domoticz version:
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Re: Z-Wave MQTT Auto Discovery dimmers missing dim level / slider not working

Post by deprutser »

Hi gizmocuz,

Thank you for the quick fix and the reminder!
I can confirm that the issue is completely resolved in the latest build. The sliders and dim percentages are updating visually in the UI again as they should.
I will make sure to check and report on GitHub next time. Thanks again for your amazing work!
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