Generic MQTT thing, state in JSON format

Setup, Configuration and Use Beginners
1

Hey Guys, need some beginner help, i have setup a generic MQTT thing, like yaml below

UID: mqtt:topic:e94f1500bd:dad57a579d
label: Eetkamer
thingTypeUID: mqtt:topic
configuration: {}
bridgeUID: mqtt:broker:e94f1500bd
channels:
  - id: eetkamer
    channelTypeUID: mqtt:switch
    label: Eetkamer
    description: ""
    configuration:
      commandTopic: homeassistant/light/eetkamer/set_light
      stateTopic: homeassistant/light/eetkamer/state
      off: '{ "state": "OFF" }'
      on: '{ "state": "ON" }'

Working great, i can turn on/off the light… but the i dont see the state changing when i change it externally, i think i need a json value for the state, the same like i do to send a payload to turn it on/off
how can i transform that ?

thnx

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2

Change the configuration of the channel as follows:

  1. install JSONPATH Transformation Service
  2. set formatBeforePublish to : '{ "state" : "%s" }'
  3. set transformationPattern to: JSONPATH:$.state
  4. delete off and on value

should look like this:

configuration:
      commandTopic: homeassistant/light/eetkamer/set_light
      formatBeforePublish: '{ "state" : "%s" }'
      stateTopic: homeassistant/light/eetkamer/state
      transformationPattern: JSONPATH:$.state

Both formatBeforePublish and transformationPattern are advanced configuration, so you need to click “show advanced” to get it visible.

1 Like
3

Thnx , that works…
For some reason the channels are corrupted when they are auto discovered… So I need to make them all manual now… Are you using HA too?

4

No, never used HA (took a glance on it in the early state…)

5

Ah ok, np

But maybe you have a look what’s wrong with this thing that was auto discovered?

Read from this post:

6

No, sorry, no idea, I never rely on auto discovery…

7

Ok, np :slight_smile:

Then I need to create them one by one, a lof of work :frowning:

8

Of course. :slight_smile:
I’m using text configuration, there is so much to simply copy&paste, then only change details like thing name, Label and parts of topics (i.e. device part of topic)

9

Yeah, need to learn openhab still, so it’s possible to create things with yaml?

10

As far as I know: No.

I’m using good old *.things files. :sunglasses:
Of course you could create things and then copy&paste the configuration to the things yaml, but that’s not as nice as doing it via VSCode and simple text files.

11

Perfect, will have a look at the things file, thnx for info! Appreciated