This mode can be enabled in secrets.h. When set to true, the device is no longer a MQTT bridge but requires another MQTT bridge and MQTT broker. Check this repo for implementation of the bridge :https://github.com/dardhal/comfoair-esp32. 

I will also publish my own version in a single board which can be hooked up via the RJ45 port directly but here's a preview in the meantime

The benefit of this mode is the display doesn't have to be hooked up to the Comfonet and can be installed anywhere in the house, as a secondary controller.

The diagram below illustrates the architecture in the two different modes