Plesse find yourself a v2 model to connect it to Homey.
In the meantime, someone reverse-engineered the Intergas phone app to get the v3 GW to work with Home Assistant using the Intergas cloud connection.
So, alternatively, an easy (and quickest) way is to add Home Assistant to the mix.
You can request for Homey support per Intergas Incomfort app topic,
or maybe @smarthomesven is seeing possibilities for a separate Intergas GW v3 app.
