I have a speedybee f405 v3 flight controller connected to a raspberry pi via UART 6, I use the MSP protocol to receive telemetry, everything works correctly. The problem is sending control commands (roll, pitch, yaw, throttle). The commands are sent without errors, but nothing changes on the receiver tab in betaflight, as I understand it, the changes should appear in betaflight.
I would recommend either switching to Ardupilot and using MAVLink to communicate with the FC or going to some Betaflight focused forum or Discord.
I tried, it didn’t work, and I still couldn’t solve the connection problem