@lbeyaert
Thanks for share that code. I will try as soon I have time, but I cannot find any reference what are the correct wire for the esp and RF transmitter and receiver.
I see that in base sketch are referring to GPIO 13,14,15 and 16, but I doubt that is the correct GPIO for esp (12 E ?) and in case if correspond to the esp pin number or esp GPIO number.
I'm thinking on using Wemos D1 mini (esp-12E) and I suppose can work fine because you refer are working on you esp 12E.
Again so many thanks for your help.
Best regards.