formatting MQTT message sensor lenght

[miso k]

Hello Weather observers,

since long time my weewx server is running - and  updated to latest 5.0.2 version.

I want to export MQTT messages to Home Assistant, but the numbers are too long.

How can I make them shorter?

Example:

outHumidity = 91.0

inHumidity = 56.0

outTemp_C = 3.777777777777776

inTemp_C = 22.88888888888889

windSpeed_kph = 9.0123264

windGust_kph = 9.3341952

I have tried to format it through format = %.1f , but it does not seems to work

My MQTT Configuration:

[[MQTT]]
        server_url = mqtt://xxx:xxx@localhost:1883/
        topic = weather
        unit_system = METRIC
        binding = archive, loop
        aggregation = individual
        log_success = False
        log_failure = True
        [[[inputs]]]
            [[[[outTemp]]]]
                name = inside_temperature  # use a label other than outTemp
                format = %.1f              # two decimal places of precision
                unit = degree_F            # convert outTemp to F, others in C
            [[[[inTemp]]]]
                unit = degree_C                 # use F instead of C
                format = %.1f                   # use two decimal places of precision
                name = inside_temperature       # use label other than inTemp
            [[[[windSpeed]]]]
                units = meter_per_second        # use knots instead of meter_per_second
                format = %.1f                   # use two decimal places of precision
                name = wind_speed               # use label other than inTemp

Thank you!

Michal

[michael.k...@gmx.at]

What's the problem with the number of digits? Are they displayed correctly in HA? Or is there a problem for HA dealing with that number of digits generally?

[Charlie Fortner]

On Wed, Apr 24, 2024, at 16:15, miso k wrote

I want to export MQTT messages to Home Assistant, but the numbers are too long.

How can I make them shorter?

I wouldn't do this with weewx, better to make the change in how Home Assistant displays the number. Via the GUI, find the device and change it's display precision settings. Here's an example:

Charlie

PS Sorry for the Home Assistant aside

[Warren Gill]

Similarly I modify the sensors in home assistant with YAML:

################################################
#  Sensors
################################################
mqtt:
  sensor:
    - name: weewx_datetime
      state_topic: "weather/loop"
      value_template: |-
        {% if value_json.dateTime is defined  %}
          {{ value_json.dateTime | float }}
        {% endif %}

    - name: weewx_temperature
      state_topic: "weather/loop"
      unit_of_measurement: "°F"
      value_template: |-
        {% if value_json.outTemp_F is defined  %}
          {{ value_json.outTemp_F | round(1) }}
        {% endif %}

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[miso k]

I have red on another forum, that the number is too big for HA to read it. Maybe I am wrong, but the possibilities that my configuration.yaml is wrong are limited already I hope

Dátum: štvrtok 25. apríla 2024, čas: 5:22:28 UTC+2, odosielateľ: michael.k...@gmx.at

[miso k]

I can read the MQTT message in HA built in MQTT plugin. So the server is correctly set up and MQTT client too. I can even read the messages in MQTT Explorer. 

The problem is, that the entity in HA is not updating and is "unknown". 

Dátum: piatok 26. apríla 2024, čas: 19:27:21 UTC+2, odosielateľ: miso k

[miso k]

finally... the name should not be in "" and it needs to be without space I hope. I am getting value updates now.

Thanks everyone for pointing me the right direction!

Dátum: piatok 26. apríla 2024, čas: 19:29:52 UTC+2, odosielateľ: miso k

[vince]

This works here with HA 2023.8 in a docker container:

  - name: "Outside"

    device_class: "temperature"

    state_topic: "vp2/loop"

    unit_of_measurement: '°F'

    value_template: "{{ value_json.outTemp | float | round(1) }}"