Use MQTT retained value as condition?

@halest wrote:

Hey,
Google wasn’t too helpful, so here’s my question for all of you lovely folks.
As far as I see it right now it is not possible in an automation condition to ask for an MQTT state, something along the lines of (and I’m completely making this up)

condition:
  - condition: template
    value_template: '{{ mqtt("my/topic") > 0 }}'

Am I correct in that assumption? I would guess I’d have to incorporate an input_number into that automation?

Best regards and happy new year
Halest

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