Hi NC03, were you successful with the Sonoff Bridge and the Warema EWFS?
I tried with the Sonoff Bridge R2 (without modification) and no signals were recognized. Thinking about to flash Tasmota in the next step.
Thanks for your help
Tom
Hi @Tom77
I tried the sonoff bridge, but failed (I did not try tasmota on it though).
My main problem was the teaching which did not work.
Finally I bought this one and I am pretty happy with it. I even bought cheap rf based garage door opener and taught them the awning for better WAF 
BroadLink - RM4 Pro, IR und HF Universal-Fernbedienung, All-in-One Hub, Code-Lernfunktion, WLAN, für Smart Home und Entertainmenteinrichtungen kompatibel mit Alexa: Amazon.de: Elektronik & Foto
The teaching process was straight forward as far as I remember (2 years ago).