Betaflight

Connect to any UART, then open Betaflight Configurator
Under Ports tab:
Enable Serial RX on the UART
Under Configuration tab:
Set Receiver Mode to Serial-based Receiver
Set Serial Receiver Provider to CRSF
Save and reboot
Connect to any UART, then open Betaflight Configurator
Under Ports tab:
Enable Serial RX on the UART
Under Configuration tab:
Set Receiver Mode to Serial-based Receiver
Set Serial Receiver Provider to CRSF
Save and reboot