Value_template condition

Configuration
1

Hello,

I’m working in ESP-Tasmota as Marlin sniffer · Discussion #11770 · arendst/Tasmota · GitHub
The serial briedge to mqtt works. Now the problem is in the sensor conditional configuration, because I receive this type of commands:

  • "SerialReceived":"echo:Print time: 0s\nok\n"
  • "SerialReceived":"ok T:15.43 /0.00 B:15.47 /0.00 @:0 B@:0\n"
  • "SerialReceived":"Not SD printing\nok\n"

My idea was configure in config.yalm one sensor for each parameter, something like this:

- platform: mqtt
    name: "Printing Time"
    state_topic: "tele/3dprint/RESULT"
    value_template: >
      {% if '{{ value_json["SerialReceived"].split(":")[1] }}' == 'Print time' %}
        {{ value_json["SerialReceived"].split(":")[2].split("\n")[0] }}
      {% endif %}
    force_update: true

The split works well, but the comparison operation ‘==’ didn’t work. I’ve tried differents ways:

  • {% if states('{{ value_json["SerialReceived"].split(":")[1] }}', 'Print time') %}
  • {% if '{{ value_json[SerialReceived].split(:)["1"] }}', 'Print time' %}
  • {% if '{{ value_json[SerialReceived].split(:)["1"] }}' == 'Print time' %}
    And any one work properly, I supose it’s a typologi issue, or it’s gramatical?

Thank you in advance

2 
    value_template: >
      {% if value_json["SerialReceived"].split(":")[1] == 'Print time' %}
        {{ value_json["SerialReceived"].split(":")[2].split("\n")[0] }}
      {% else %} 
        N/A
      {% endif %}
3

Ok, thank you, it works now!!

Just need to add {{ N/A }

4

Not sure what you mean by this?

5

I mean, in the else answer, when I put just N/A the answer was N/A; but if you put {{ N/A }} the answer is nothing, the old value stay. At least in my settup

6

Putting things in {{ }} will force them to be evaluated as a template. {{ N/A }} is actually calculating the division of non existent string N by non existent string A. I would be very surprised if this has not generated an error in your log.

Some better options:

      {% else %} 
        none
      {% endif %}

      {% else %} 
        unknown
      {% endif %}

      {% else %} 
        0
      {% endif %}

      {% else %} 
        -
      {% endif %}
7

is it possible to only trigger a value change if the if statement is fulfiled?
if i remove “else” it resets the value to an empty value. is there an option to discard the change and just trigger the values if there are any matching?

8

You can use this to keep the state the same in the else case:

      {% else %} 
        {{ this.state }}
      {% endif %}
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