Mqtt updates the basic UI but my gateway brightness doesn't change

Setup, Configuration and Use Beginners
, ,
1

I want to change the brightness of my gateway with an mosquitto_pub command like this:
mosquitto_pub -u mqtt_user -P password -t xiaomi/brightness -m 60
This is the rule that I defined for my gateway brightness:

Group gXiaomi
Group gMiCube
Dimmer Xiaomi_Brightness "Brightness" (gXiaomi, gMiCube) {channel="mihome:gateway:34ce00907400:brightness", mqtt=">[mosquitto:xiaomi/brightness:command:*:default],<[mosquitto:xiaomi/brightness:state:default]"}

This is my sitemap:

sitemap xiaomi label="Xiaomi" {
    Frame label="Gateway" {
        Group item=gXiaomi
    }
    Frame label="Cube" {
        Group item=gMiCube
    }
}

When I use the mosquitto command mentioned above, the dimmer change its value in simple UI, but my gateway brightness doesn’t change in real world.

2

First question:
When you do:
mosquitto_pub -u mqtt_user -P password -t xiaomi/brightness -m 60
Does the gateway brightness change?

There are two bindings on the same item and they may conflict.
Second question:
What happens when you remove the channel="mihome:gateway:34ce00907400:brightness", part fron the binding config?

3

The answer to your first question is: No. My Xiaomi Aqara gateway’s brightness doesn’t change. However, the dimmer’s slider changes in Basic UI ( this shows that the mqtt command is received by openHAB but it has no effect on the gateway)

The answer to your second question is: If I remove the channel section, how does openHAB know that this item is bound to the gateway’s brightness? - I separate them like this but nothing changes:

Dimmer Xiaomi_Brightness "Brightness" (gXiaomi, gMiCube) {channel="mihome:gateway:34ce00907400:brightness"
Dimmer Xiaomi_Brightness "Brightness" (gXiaomi, gMiCube) {mqtt=">[mosquitto:xiaomi/brightness:command:*:default],<[mosquitto:xiaomi/brightness:state:default]"}

I get duplicate key warning in the logs

4

I think I know what you want to do, you want to use the xiaomi binding the change the brightness on the gateway.
What is the MQTT used for?

1 Like
5

I use MQTT so that I can control my xiaomi devices via my web-based nodeJS app. In addition, I can receive data generated by the xiaomi sensors in my application via MQTT. This is why I’m trying to configure MQTT binding.

6

OK test something.
Remove the mqtt binding from the item config.
Can you change the brightness.
We may have to split the binding to two items and use a rule to make it all work together. But I have limited info. What does your nodejs app do?