Anyone? Any ideas?

Hello,
I have an LILYGO ![TTGO T5-4.7 Inch E-paper ESP32 V3] Version and I want to control simulate a controller for my heating boiler. The termostat that I have installed uses a 868,35 mhz frequency. Is there any RF transciever module compatible with my LILYGO?
My plan is to create an WiFi enabled termostat with my TTGO T5-4.7 Inch E-paper ESP32 V3 Version, but first I'll have to decode the communication between my current termostat and the boiler controler. To be more clear,I have made a scheme: