This is what I did: Somfy sunscreen automated and Alexa control
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To be clear: RFXCom can only transmit, but not receive Somfy RTS.
As far as I know it is because the frequency is switched from 433.92Mhz to 433.42Mhz when sending Somfy RTS commands for a short time.
Thus, it is not possible for a remote control to be read in parallel.