Test, if json object exists

[schneich]

Dear community,

I have build a little temperature and humidity sensor with D1mini and Tasmota.
I am using automations and mqtt to set it to deep sleep. This is all working fine.
For more details: Link

I would like to add a sensor, which should indicate, how long the current DeepSleepTime is.

When changing the DeepSleepTime via mqtt, Tasmota sends back a confirmation:

stat/D1mini/Dachzimmer/RESULT -> {"DeepSleepTime":3600}

I can parse this into a sensor with this:

    - name: "Dachzimmer DeepSleepTime"
      unique_id: "mqtt.Dachzimmer.DeepSleepTime"
      state_topic: "stat/D1mini/Dachzimmer/RESULT"
      value_template: '{{value_json.DeepSleepTime | timestamp_custom("%H:%M", False, "unavailable") }}'
      device_class: "duration"

Unfortunately, Tasmota then sends the timestamp of the next wakeup via the same topic:

stat/D1mini/Dachzimmer/RESULT -> {"DeepSleep":{"Time":"2023-01-09T24:00:00","Epoch":1673301600}}

As there is no “DeepSleepTime”-object in the second json, my above sensor throws an error.

I am looking for a way to have something like a trigger-based sensor, which only updates, if the json-object “DeepSleepTime” exists. How do I check this in a template?

There has been something interesting by @petro, but it does not work - or I do not understand it.

[schneich]

I just stumbled across regex im HomeAssistant I will try something with this. Update to follow.

[123 (Taras)]

    - name: "Dachzimmer DeepSleepTime"
      unique_id: "mqtt.Dachzimmer.DeepSleepTime"
      state_topic: "stat/D1mini/Dachzimmer/RESULT"
      value_template: >
        {{ value_json.DeepSleepTime | timestamp_custom("%H:%M", False, "unavailable") if value_json.DeepSleepTime is defined else this.state }}
      device_class: "duration"

• If value_json.DeepSleepTime is defined then it displays the received time in the specified format.
• If value_json.DeepSleepTime is not defined then it displays the sensor’s current value (this.state).

[schneich]

@123
Thank you very much for your quick help. I played around with “is defined”, but got always the error, that the attribute “DeepSleepTime” is not defined, or something like this.

I will test your template tomorrow evening[*] and report back, but I am confident that it will work.

As I do love regex, here the template, I came up with just a minute ago in the dev tools.

{% if ( value_json | regex_search('DeepSleepTime') )  %}
  {{ value_json.DeepSleepTime | timestamp_custom("%H:%M", False, "error in mqtt value")  }}
{% else %}
  {{ states( 'sensor.dachzimmer_deepsleeptime' ) }}
{% endif %}

I could probably change it to this?

    - name: "Dachzimmer DeepSleepTime"
      unique_id: "mqtt.Dachzimmer.DeepSleepTime"
      state_topic: "stat/D1mini/Dachzimmer/RESULT"
      value_template: >
        {% if ( value_json | regex_search('DeepSleepTime') )  %}
          {{ value_json.DeepSleepTime | timestamp_custom("%H:%M", False, "error in mqtt value")  }}
        {% else %}
          {{ this.state }}
        {% endif %}
      device_class: "duration"

[*] I look myself out of the backend via firewall, so that I get to bed before midnight…

[123 (Taras)]

The example I posted should work. You can test it in the Template Editor using the following example:

{% set value_json = { 'foo': 5000 } %}
{{ value_json.DeepSleepTime is defined }}
{{ value_json | regex_search('DeepSleepTime') }}
---
{% set value_json = { 'DeepSleepTime': 5000 } %}
{{ value_json.DeepSleepTime is defined }}
{{ value_json | regex_search('DeepSleepTime') }}

[schneich]

Hi @123,

I just included your template and it works perfectly fine. Thank you very much for your quick help.

Take care,
Chris

[schneich]

Hi @123,

I am still struggling with my sensor.
The mqtt provides this:

{"DeepSleepTime":300}
{"DeepSleepTime":900}
{"DeepSleepTime":3600}

I am currently using this template:

    - name: "Wohnzimmer DeepSleepTime"
      unique_id: "mqtt.Wohnzimmer.DeepSleepTime"
      state_topic: "stat/D1mini/Wohnzimmer/RESULT"
      value_template: >
        {{ value_json.DeepSleepTime | timestamp_custom("%H:%M", False, "unavailable") if value_json.DeepSleepTime is defined else this.state }}
      device_class: "duration"
      unit_of_measurement: "h"

As soon, as the DeepSleepTime is 3600s → I get “01:00”. If it is one of the others, I get “0”. This comes probably from the UoM. (I added the UoM because the log was complaining about the missing configuration for the “duration”…)

Could I change the template to show something like this:

5 min
15 min
1 hour (or if easier: 60min)

thanks,
Chris

p.s.: where do I find the documentation for all that time-related stuff? I search on the homeassistant documentation, I search for jinja2, … but I couldn’t find anything helpful…)
ok, I found the “duration”: Sensor - Home Assistant

[123 (Taras)]

If you specify the unit of measurement to be “h” then the result produced by value_template must be a float or int (i.e. numeric). You can’t have the template report 00:30 if you are using h as the unit of measurement. In other words, if the value of DeepSleepTime is 1800 then the template should report 0.5 (half an hour).

---

If you want it to report the time as text that includes “min” and “hour” then I don’t believe you can set the sensor’s device_class to be ‘duration’ or specify a unit of measurement.

If you remove device_class and unit_of_measurement, you can try this and see if it meets your needs:

value_template:
  {{ relative_time(now() - timedelta(seconds = value_json.DeepSleepTime)) }}

[schneich]

Hi @123 ,

thank you very much for your help.
This is my new sensor:

    - name: "Wohnzimmer DeepSleepTime"
      unique_id: "mqtt.Wohnzimmer.DeepSleepTime"
      state_topic: "stat/D1mini/Wohnzimmer/RESULT"
      value_template: >
        {% if value_json.DeepSleepTime is defined %}
          {{ relative_time(now() - timedelta(seconds = value_json.DeepSleepTime  )) }}
        {% else %}
          {{ this.state }}
        {% endif %}

with this result in Dashboard:

Chris