Openhab & Googlehome: Lights switched on just with 10% brightness

Hi all,

I have an issues with Google when commanding it to switch on a light. It seems it doesn’t restore the last state, but instead sending some defaults. e.g. dimmed to just 10%. Which is a bit annoying.

About my System

  • Platform information:
    • Hardware: RaspberryPi 3 B+
    • OS: Linux openhab 4.19.66-v7+
    • Java Runtime Environment: Raspberry openjdk version “1.8.0_222”
    • openHAB version: 2.4.0 (Build)

I’m using a Tasmota RGB LED Strip, accessd via MQTT: (excerpt), and exposed is the HSBColor Item to Google via the “Lighing” Tag.

Thing definition

 Thing topic Tasmota_smart_A355B4 "Tasmota RGB Schreibtisch" {
      Type switch : PowerSwitch         [ stateTopic="tele/smart_A355B4/STATE", transformationPattern="JSONPATH:$.POWER", on="ON", off="OFF", commandTopic="cmnd/smart_A355B4/POWER", on="ON", off="OFF", postCommand=true]
      Type colorRGB : ColorRGB          [ stateTopic="tele/smart_A355B4/STATE", transformationPattern="JSONPATH:$.Color" , commandTopic="cmnd/smart_A355B4/Color", rgb=true ]
      Type colorHSB : ColorHSB          [ stateTopic="tele/smart_A355B4/STATE", transformationPattern="JSONPATH:$.HSBColor" , commandTopic="cmnd/smart_A355B4/HsbColor", rgb=false ]
      Type number : Scheme              [ stateTopic="tele/smart_A355B4/STATE", transformationPattern="JSONPATH:$.Scheme", min=0, max=4, commandTopic="cmnd/smart_A355B4/Scheme", min=0, max=4]
      Type switch : Fade                [ stateTopic="tele/smart_A355B4/STATE", transformationPattern="JSONPATH:$.Fade", on="ON", off="OFF", commandTopic="cmnd/smart_A355B4/Fade", on=1, off=0]
      Type switch : GammaCorrection     [ stateTopic="tele/smart_A355B4/STATE", transformationPattern="JSONPATH:$.LedTable", on="ON", off="OFF", commandTopic="cmnd/smart_A355B4/CT", on=1, off=0]
      Type number : ColorTemperature    [ commandTopic="cmnd/smart_A355B4/CT", min=153, max=500 ]
      Type number : Brightness          [ stateTopic="tele/smart_A355B4/STATE", transformationPattern="JSONPATH:$.Dimmer", min=0, max=100, commandTopic="cmnd/smart_A355B4/Dimmer", min=0, max=100]
      Type number : Speed               [ stateTopic="tele/smart_A355B4/STATE", transformationPattern="JSONPATH:$.Speed", min=1, max=20, commandTopic="cmnd/smart_A355B4/Speed", min=1, max=20]

Item definition

Group RGBLED02 "RGB Schreibtisch"
Switch Tasmota_RGB02 "Schreibtischlich Schalter" (RGBLED02,RGBLights) {channel="mqtt:topic:SHGMQTTBroker:Tasmota_smart_A355B4:PowerSwitch"}
Color Tasmota_RGB02_Color "Schreibtisch RGB" (RGBLED02,RGBLights) ["Lighting"]  {channel="mqtt:topic:SHGMQTTBroker:Tasmota_smart_A355B4:ColorHSB"}
Number Tasmota_RGB02_Speed "Geschwindigkeit [%d]"( RGBLED02,RGBLights) {channel="mqtt:topic:SHGMQTTBroker:Tasmota_smart_A355B4:Speed"}
Number Tasmota_RGB02_Scheme "Szenario [%d]" (RGBLED02,RGBLights) {channel="mqtt:topic:SHGMQTTBroker:Tasmota_smart_A355B4:Scheme"}
Switch Tasmota_RGB02_Gamma "Gammakorrektur" (RGBLED02,RGBLights) {channel="mqtt:topic:SHGMQTTBroker:Tasmota_smart_A355B4:GammaCorrection"}
Number Tasmota_RGB02_CT "Farbtemperatur" (RGBLED02,RGBLights) {channel="mqtt:topic:SHGMQTTBroker:Tasmota_smart_A355B4:ColorTemperature"}
Switch Tasmota_RGB02_Fade "Weicher Übergang" (RGBLED02,RGBLights) {channel="mqtt:topic:SHGMQTTBroker:Tasmota_smart_A355B4:Fade"}

Specific line:

Color Tasmota_RGB02_Color "Schreibtisch RGB" (RGBLED02,RGBLights) ["Lighting"]  {channel="mqtt:topic:SHGMQTTBroker:Tasmota_smart_A355B4:ColorHSB"}

when i say “OK google, switch on Schreibtischlicht” (alias for “Schreibtisch RGB”), Google switches it on with the following values (queried via MQTT subscibtion):


qos : 0, retain : false, cmd : publish, dup : false, topic : cmnd/smart_A355B4/HsbColor, messageId : , length : 37, Raw payload : 514844535744494848

What kind of Things, Items have you defined and what are you exposing how to get a light switched on with the last state or some specific values?


Hello, I have the same issue but I don’t think it’s related to google assistant.

In the UI, when I shutdown a lamp with the color picker (using the arrow down button) and then start the lamp again (using the arrow up button), my lamp is set to 10% brightness.

I guess you are right. somehow the last brightness is not stored or recovered.

You’re looking for *onBrightness, have a look at the MQTT binding description.

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