EQ3 Bluetooth Smart Thermostats - Use temperature from different sensor

Feature Requests
1

Hi there,
I would like to request a small feature for the EQ3 Bluetooth Smart Thermostats - component.

Since the EQ3 thermostats do not report room temperature, the target temperature is currently reported.
I use a couple of external temperature sensors that I have installed in the same rooms as the thermostats. I would prefer to have this temperature shown on the thermostat card instead of the target temperature. My idea is to extend the configuration and to allow specifying a temperature sensor:

climate:
  - platform: eq3btsmart
    devices:
      room1:
        mac: "00:11:22:33:44:55"
        temperature_sensor: "sensor.room1_temperature"

If Home Assistant’s architecture allows components to access other component’s values, this should be rather easy to implement.

Thanks!