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abmantis authored Dec 11, 2024
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or via Home Assistant Configuration->Integration->MQTT Configure->Listen to topic espaltherma/# -> Start Listening

## Step 3 (optional) - Controling your Daikin Altherma heat pump
## Step 3 (optional) - Controlling your Daikin Altherma heat pump

ESPAltherma cannot change the configuration values of the heat pump (see [FAQ](#faq)). However, ESPAltherma can control a relay on MQTT that can simulate an *external On Off thermostat*. Doing so allows to remotely turn on/off the heating function of your heat pump. A second relay can be used to trigger the cooling function.

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## Great! I can now monitor my heat pump! Can I change the configuration values too?

Not directly. It might be possible to change registry values using the serial port but I'm not aware of this. If you know, comment on [the dedicated issue](/../../issues/1).
Not directly. It might be possible to change registry values using the serial port but I'm not aware of this. If you know, comment on [the dedicated issue](https://github.com/raomin/ESPAltherma/issues/1).

However, ESPAltherma, supports an extra GPIO to control a relay that you can plug as *external On/Off thermostat*. See [**Controling your Daikin Altherma heat pump**](#controling-your-daikin-altherma-heat-pump).
However, ESPAltherma, supports an extra GPIO to control a relay that you can plug as *external On/Off thermostat*. See [**Controlling your Daikin Altherma heat pump**](#step-3-optional---controling-your-daikin-altherma-heat-pump).

If you want to configure your heat pump using an arduino, you can interact with the P1P2 serial protocol (the one of the digital thermostats) using the [nice work on P1P2Serial](https://github.com/Arnold-n/P1P2Serial) of Arnold Niessen.

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