Making a Radio IO-HomeControl Tahoma :

No needed to have internet, register, or send personnal datas to them using API

Home Assistant Compatible for ~15$

2W ATLANTIC THERMOR SAUTER devices and others 2W SOMFY VELUX
Permit to send/receive any Commands with MQTT Home assistant / Android

Some essentials commands for a Thermor/Sauter/… devices 0x20 privates commands :

Message 0c61 0100 -> 0c61 0100 02 Mode (0x00 is MANUAL, 0x01 is AUTO, 0x02 is PROG, 0x04 is OFF )
Message 0c61 0103 -> 0c61 0103 CD setTemp (0xCD -> 20.5°C)
Message 0c61 0104 -> 0c61 0104 23 Abaissement max T°ECO (0x23 -> 3.5°C)
Message 0c61 0105 -> 0c61 0105 28 Abaissement Mode auto (0x28 -> 4.0°C) Other choices /3.0/2.0)
Message 0c61 010C -> 0c61 010C 00 Pilotage Interne/Externe
Message 0c61 010E -> 0c61 010E 01 Window Detection
Message 0c61 010F -> 0c61 010F 0D Date/Time (seconds when asking state)

Message 0c61 010E -> 0c61 0110 01 Presence Detection
Message 0c61 011e -> 3 slots availables for hours programmation by day of week

A lot of more commands are availables (not only the 0x61)
(Hidden with the original expensive gateway)