Filter sensor not being updated when source sensor is updated

@baz123 wrote:

I do not understand why the filter sensor is not updated when the source sensor is. I have defined a time_date sensor. I would expect the filter to update every time the source sensor is updated. Is that an incorrect expectation? This is a moving window but I have also tried it with lowpass with same behaviour. The system has been running for a while since last restart and I can see delays of over 30 mins sometimes.

Sensor and filter

- platform: time_date
  display_options:
    - 'time'
    - 'date'
    - 'date_time'
    - 'date_time_utc'
    - 'date_time_iso'
    - 'time_date'

## Study
- platform: mqtt
  name: "studyroomtemp"
  state_topic: "emon/sensor/mi_t_4c65a8d8e0d8/state"
  unit_of_measurement: '°C'
  device_class: temperature

- platform: filter
  name: studyroomtempfil
  entity_id: sensor.studyroomtemp
  filters:
    - filter: time_simple_moving_average
      window_size: 00:05
      precision: 1

Looking at the states

{{ states('sensor.studyroomtemp' )}}
{{ states.sensor.studyroomtemp.last_updated}}
{{ states('sensor.studyroomtempfil' )}}
{{ states.sensor.studyroomtempfil.last_updated}}

20.21
2020-03-30 09:50:12.171099+00:00
20.5
2020-03-30 09:48:40.278234+00:00  

Posts: 10

Participants: 4

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