It is POSTing an overlay to `https://my.tado.com/api/v2/homes/123456/overlay`

{
    "overlays": [
        {
            "overlay": {
                "setting": {
                    "power": "OFF",
                    "type": "HEATING"
                },
                "termination": {
                    "typeSkillBasedApp": "MANUAL"
                }
            },
            "room": 2
        }
    ]
}

That's what I get when I look at the network requests on https://app.tado.com/en/main/home