Rest sensor unknown does not update

Jack_B_Nimble · February 24, 2024, 11:23pm

I have an esp32 running a simple rest server. It returns this

{"temperature":73.95800018,"pressure":30.02012825,"humidity":33.10644531,"battery":4152}

My configuration.yaml


# Loads default set of integrations. Do not remove.
default_config:

# Load frontend themes from the themes folder
frontend:
  themes: !include_dir_merge_named themes

automation: !include automations.yaml
script: !include scripts.yaml
scene: !include scenes.yaml

rest:
  - resource: "http://192.168.1.247/data.xml"
    scan_interval: 300
    sensor:
      - name: "Temperature"
        value_template: "{{ value_json[0].temperature }}"
        device_class: temperature
        state_class: measurement
      - name: "Pressure"
        value_template: "{{ value_json[0].pressure }}"
        device_class: pressure
        state_class: measurement
      - name: "Humidity"   
        value_template: "{{ value_json[0].humidity }}"
        device_class: humidity
        state_class: measurement
      - name: "Battery"   
        value_template: "{{ value_json[0].battery }}"
        device_class: battery
        state_class: measurement

Been trying for days to get the data into HA so this is a fresh bare HA install

I have tried changing the value_template(and everything else) a hundred different ways,
this is as simple and paired down as I can make it yet it is still somehow beyond me

tom_l · February 24, 2024, 11:39pm

There is no list in your data so no need for [0] in your templates.

Jack_B_Nimble · February 25, 2024, 12:59am

Thank You!

Tried

        value_template: "{{ value_json['temperature'] }}"

still no data

        value_template: "{{ value_json.temperature }}"

gives template error

Jack_B_Nimble · February 25, 2024, 1:04am

I’ve tried setting this up as a RESTful sensor also with the same result. I even reconfigured the REST server to provide this simple format. The entities show up but “unknown” for all values

# Loads default set of integrations. Do not remove.
default_config:

# Load frontend themes from the themes folder
frontend:
  themes: !include_dir_merge_named themes

automation: !include automations.yaml
script: !include scripts.yaml
scene: !include scenes.yaml

rest:
  - resource: "http://192.168.1.247/data.xml"
    scan_interval: 300
    sensor:
      - name: "Temperature"
        value_template: "{{ value_json['temperature'] }}"
        device_class: temperature
        unit_of_measurement: "°F"
      - name: "Pressure"
        value_template: "{{ value_json['pressure'] }}"
        device_class: pressure
        unit_of_measurement: "inHg"
      - name: "Humidity"   
        value_template: "{{ value_json['humidity'] }}"
        device_class: humidity
        unit_of_measurement: "%"
      - name: "Battery"   
        value_template: "{{ value_json['battery'] }}"
        device_class: battery
        unit_of_measurement: "mV"

This looks as close to the example here “RESTful - Home Assistant” and “RESTful Sensor - Home Assistant” as I can do.

tom_l · February 25, 2024, 1:40am

What error exactly?

Jack_B_Nimble · February 25, 2024, 1:47am

This one(s)

* Template variable error: 'value_json' is undefined when rendering '{{ value_json.temperature }}'
* Template variable error: 'value_json' is undefined when rendering '{{ value_json.pressure }}'
* Template variable error: 'value_json' is undefined when rendering '{{ value_json.humidity }}'
* Template variable error: 'value_json' is undefined when rendering '{{ value_json.battery }}'

tom_l · February 25, 2024, 1:50am

This is incorrect:

        device_class: battery
        unit_of_measurement: "mV"

The device class battery can only have a % unit. Use the voltage device class if the unit is mV.

https://www.home-assistant.io/integrations/sensor/#device-class

tom_l · February 25, 2024, 1:51am

Then you are not sending this data:

Jack_B_Nimble · February 25, 2024, 1:53am

This is the data

{
“temperature”: 76.1720047,
“pressure”: 30.00678444,
“humidity”: 33.60058594,
“battery”: 4120
}

I’ll cut the battery section and try again but…

tom_l · February 25, 2024, 1:56am

Oh I just noticed this:

XML to json conversion may be messing it up. As you are not sending XML but you have an XML file extension.

What does this return:

rest:
  - resource: "http://192.168.1.247/data.xml"
    scan_interval: 300
    sensor:
      - name: "Test value"
        value_template: "{{ value }}"
      - name: "Test value_json"
        value_template: "{{ value_json }}"

tom_l · February 25, 2024, 2:01am

You could also try this:

rest:
  - resource: "http://192.168.1.247/data.xml"
    headers:
      Content-Type: application/json
    scan_interval: 300
    sensor:
      - name: "Temperature"
        value_template: "{{ value_json['temperature'] }}"
        device_class: temperature
        unit_of_measurement: "°F"
      - name: "Pressure"
        value_template: "{{ value_json['pressure'] }}"
        device_class: pressure
        unit_of_measurement: "inHg"
      - name: "Humidity"   
        value_template: "{{ value_json['humidity'] }}"
        device_class: humidity
        unit_of_measurement: "%"
      - name: "Battery"   
        value_template: "{{ value_json['battery'] }}"
        device_class: voltage
        unit_of_measurement: "mV"

Jack_B_Nimble · February 25, 2024, 2:04am

Template variable warning: 'value_json' is undefined when rendering '{{ value_json }}'

I think I’ve tried everything. Its been a week, totally gutted system starting over and over.

tom_l · February 25, 2024, 2:05am

What is the value of:

    sensor:
      - name: "Test value"
        value_template: "{{ value }}"

Did you try this?

Jack_B_Nimble · February 25, 2024, 2:16am

pasted as you posted still unknown ,

"Test value"

never got that far because above error

Jack_B_Nimble · February 25, 2024, 2:21am


    sensor:
      - name: "Test value"
        value_template: "{{ value }}"

Not found: /data.xml


      - name: "Test value_json"
        value_template: "{{ value_json }}"

returns nothing

tom_l · February 25, 2024, 2:26am

What do you get when you visit this in a web browser:

http://192.168.1.247/data.xml

Jack_B_Nimble · February 25, 2024, 2:26am

Holy Stuff

rest:
  - resource: "http://192.168.1.247/data"
    headers:
      Content-Type: application/json
    scan_interval: 300
    sensor:
      - name: "Temperature"
        value_template: "{{ value_json['temperature'] }}"
        device_class: temperature
        unit_of_measurement: "°F"
      - name: "Pressure"
        value_template: "{{ value_json['pressure'] }}"
        device_class: pressure
        unit_of_measurement: "inHg"
      - name: "Humidity"   
        value_template: "{{ value_json['humidity'] }}"
        device_class: humidity
        unit_of_measurement: "%"
      - name: "Battery"   
        value_template: "{{ value_json['battery'] }}"
        device_class: voltage
        unit_of_measurement: "mV"

It works just removing .xml I feel so stupid I wasted a week, never ever read the docs!

Jack_B_Nimble · February 25, 2024, 2:28am

Thanks Tom, I really appreciate your help getting this working.
Now I’m throwing the whole damn thing off the deck!