Problems with Google Assistant and a bulb with on/off + dimming

Setup, Configuration and Use Items & Sitemaps
1

I have an MQTT-controlled bulb configured in OH with both a switch and a dimmer type, like this:

Type switch : lr1            [ stateTopic="tuya/bslr_bulb_1/state",
                               commandTopic="tuya/bslr_bulb_1/command", on="ON", off="OFF"]
Type dimmer : lr1dim         [ stateTopic="tuya/bslr_bulb_1/white_brightness_state",
                               commandTopic="tuya/bslr_bulb_1/white_brightness_command", min=0, max=100, step=1 ]

I am trying to figure out how to expose this to Google Assistant so that there is one device with both a switch (ON/OFF) characteristic and a dimmer (0-100%) characteristic.

Right now I just have the dimmer type exposed in my .items file:

Dimmer Dim_LRBulb1 “Dimmer LR Bulb 1 [%d %%]” (gLights1) [“Lighting”] {channel=“mqtt:topic:gcp:other:lr1dim”, ga=“Light”}

When I tell Google to turn it off, it sends brightness=0 (since there is only a dimmer type exposed).

I’ve tried various things, but every thing I try results in two objects in Google Home: one for the switch type and one for the dimmer type.

I know what I want is possible, because when this bulb is exposed through the SmartLife app to GA, I get the correct behavoir (Telling Google to turn off = a command OFF; telling Google to set 50% = brightness command).

Does anyone have any examples of exposing a single device to GA with both characteristics? If you could post config examples, that would help.

Thanks!

2

You probably shouldn’t tag an item and have meta data for it.

Here is one of my dimmers

Thing

    Thing topic Kitchen_Bench_Light "Bench Light" @ "Kitchen" {
    Channels:
        Type dimmer : dimmer  [ stateTopic ="Kitchen_Bench_Light/stat/DIMMER", transformationPattern ="JSONPATH:$.Dimmer", commandTopic ="Kitchen_Bench_Light/cmnd/Dimmer" ]
      }

Item

Dimmer  Kitchen_Bench
        "Kitchen Bench"
        {ga="Light", channel="mqtt:topic:myMQTTBroker:Kitchen_Bench_Light:dimmer"}

Dimmer item and accept on and off commands it depends on how your device requires these commands to be sent.