are you sure the RF part is controllable by the iot module?
I've just taken a standard 16a DIY switch apart, not yet posted about it anywhere, and it seems to have a RF module also that seems to control the relay separate to the BK module. There are not enough GPIOs connected for it to do anything smart. The RF daughterboard on mine controls its own red LED.
I think! Not 100% sure yet. Just waiting for an RF remote to arrive. There's no mention of RF on the packaging or the web site or in the app when paired for mine.
Added after 1 [minutes]:
and like mine, GPIO extraction from your factory dump shows no RF or UNKNOWN pins
- Button (channel 1) on P24
- LED (channel 1) on P11
- WiFi LED on P10
- Relay (channel 1) on P8