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How to setup the RFD900x TXMOD with Pixhawk 2.1?

I have the RFD900x TXMOD bundle. I have installed it in a rover with Pixhawk 2.1. I can see the telemetry through the TXMOD Wifi, but I cannot see the reception of the PPM radio signal. I cannot activate the radio controls on the Mission Planner screen. Could someone help me with this please? Thank you very much for your time.

Servers by jDrones