Does value template support dashes in sensors?

Configuration
1

I’m using TASMOTA firmware with my Sonoff’s and in a recent update they have added the ability to have multiple DHT sensors and thus append -GPIO to each sensor. This seems to be unsupported by Home Assistant value templates. i.e.:

[homeassistant.helpers.template] Error parsing value: 'dict object' has no attribute 'AM2301' (value: {"Time":"2017-05-07T09:08:27", "AM2301-14":{"Temperature":20.8, "Humidity":60.4}, "TempUnit":"C"}, template: {{ value_json.AM2301-14.Temperature }})

This sensor before the -14 worked fine: - platform: mqtt name:

"Master Bedroom Temp" state_topic: "tele/master_bedroom_th/SENSOR" unit_of_measurement: "°C" qos: 1 value_template: '{{ value_json.AM2301-14.Temperature }}'

The format of the JSON data is:

{"Time":"2017-05-07T09:33:27", "AM2301-14":{"Temperature":21.1, "Humidity":61.2}, "TempUnit":"C"}

Is there any way to either escape the - or quote the json_value in such a way that it doesn’t balk at the dash?

2

Try: value_json[“AM2301-14”].Temperature

3

I’m afraid that didn’t work:

2017-05-07 10:10:50 ERROR (MainThread) [homeassistant.config] Invalid config for [sensor.mqtt]: invalid template (TemplateSyntaxError: expected name or number) for dictionary value @ data['value_template']. Got '{{ value_json.["AM2301-14"].Temperature }}'. (See ?, line ?). Please check the docs at https://home-assistant.io/components/sensor.mqtt/
4

Sorry, I don’t know much about MQTT sensors, but the template JSON parse is solid.
You can paste this into the template parser in developer tools and extract your value…

{%set value_json={"Time":"2017-05-07T09:33:27", "AM2301-14":{"Temperature":21.1, "Humidity":61.2}, "TempUnit":"C"}%}
{{ value_json["AM2301-14"].Temperature }}
5

Im my repeated experience the template parser has about as much in common to actual value templates as fiction has to fact.

6

You can test that HA doesn’t accept the template by creating it in your system and testing the config (not even any need to restart.

7

FYI, This is the solution… Awareness of double and single quotes is important.

  - platform: mqtt
    name: "Master Bedroom Temp"
    state_topic: "tele/master_bedroom_th/SENSOR"
    unit_of_measurement: "°C"
    qos: 1
    value_template: "{{ value_json['AM2301-14'].Temperature }}"

Thanks to https://github.com/home-assistant/home-assistant/issues/3830

1 Like
8

I tried to follow your solution, but this did not work for me, but the following did tho.

  • platform: mqtt
    name: “Landing Temperature”
    state_topic: “tele/HW/SENSOR”
    value_template: “{{ value_json.AM2301.Temperature }}”
    unit_of_measurement: “°C”

thought i would share :slight_smile:

9

Yes, this would be because Tasmota reverted to not requiring the -GPIO if you only had one sensor (as it was confusing too many people).

If you were to connect multiple AM2301 sensors I think this format would still be required.