Can't get any result

Configuration
1

I have tried Postman with the included url and it works without problems. But when trying to use an rest-sensor I always get the state “unknown”. Can anyone tell me what I am doing wrong ?

sensor:
  - platform: rest
    name: My Chart Data
    resource: https://vattenwebb.smhi.se/hydronu/data/point?x=633280.0000821674&y=6722755.375833435
    method: GET
    headers:
      Content-Type: application/json
    value_template: "{{ value_json['chartData']['coutForecast']['data'] | tojson }}"
    timeout: 120  # Increase timeout to handle slow response
    scan_interval: 3600  # Update every hour
    json_attributes:
      - chartData

image
image371×792 16.2 KB

2

My guess is that the result of the template is a value whose length exceeds what can be stored in an entity’s state value (255 characters).

EDIT

I tested the URL you posted and confirmed that it exceeds the limit. You’ll need to save it in an attribute like Troon suggested. Attributes can store up to 16KB.

3

Use value_template: "{{ now() }}" and get the data you need from the attributes.

1 Like
4

Thanks for the help, the rest sensor works as expected now. But my next problem is that my template sensor (that I planned to use with apex-charts) does not work. It is always unknown. The strange part is that if I just enter the logic part into the Developer Tools - Template I get an array with values.

I first thought that it could be that the template sensor was trying to use the data value before it was completly fetched. But even if I use the update entity service it does not populate with any data.

- platform: rest
    name: vattenwebb_rest
    resource: https://vattenwebb.smhi.se/hydronu/data/point?x=633280.0000821674&y=6722755.375833435
    method: GET
    headers:
      Content-Type: application/json
    value_template: "{{ now() }}"
    timeout: 30
    scan_interval: 7200
    json_attributes_path: "$.chartData.coutForecast"
    json_attributes:
      - data

- platform: template
    sensors:
      vattenwebb_timeseries:
        friendly_name: "Vattenwebb Timeseries"
        value_template: >
          {% set data = state_attr('sensor.vattenwebb_rest', 'data') %}
          {% if data is not none %}
            {{ data | tojson }}
          {% else %}
            []
          {% endif %}
5

Looking at the image you posted before there seems to be more nested keys in between.
Look at the sensor in the developer tools

6

sorry, I pasted the wrong rest-sensor but I updated the previous post

7

You’re still trying to fit a big data structure into an entity state, but this time in the template sensor.

States are limited to 255 characters.

8

Ok, do you have any suggestions of how would I solve the problem getting the data into an apex-chart ?

9

Looks to me like you can specify an attribute as the source of a series:

…so use the attribute of your Rest sensor.

I don’t have any experience with apex charts though — I’m just reading the docs.