The hygrometers are from TFA/Dorstmann. rtl_433 recognizes them as “Ambientweather-F007TH”. There’s one post for OpenMQTTGateway that talks about a similar (maybe same) TFA sensor: TFA Sensor not detected anymore since v0.9.6 (I tried flashing the SFB with said modified pilight version to no avail: No signal received).
The remote control is a generic remote (rtl_433 says “generic_remote”), the protocol it’s using is EV1527. Again: When I press buttons on the remote (e.g. on/off) the RF light on the SFB is blinking red, so it is physically seeing something.
It is totally weird that both ESPurna and RFLink32 work with the same hardware - I just don’t like them and would love OMG (is that the abbreviation?) to work.