How to create new entity from node-red's MQTT topic

Configuration
1

I have an Arduino with OneWire temperature sensors, and I want to connect it to Hass.io.
Arduino sending UDP message in form

"1W 28FF3719721605EF TEMP 24812"

Where 28FF3719721605EF is address and 24812 is temperature.
In Node-Red I transform it to MQTT topic
mqtt_topic
and send it via mqtt out node to Hass.io mqtt broker (Mosquito MQTT).

In Hass.io Developer Tools -> MQTT I can see this topic:
hass_mqtt_topic
But Im unable to create new entity for this.

In configuration.yaml i have this:

sensor:
  - platform: "mqtt"
    state_topic: "OneWire/28FF3719721605EF"
    unit_of_measurement: "°C"
    device_class: "temperature"
    value_template: "{{ value_json.temperature }}"

Where is the problem? How to createn new entity for this MQTT topic?