Devo10 which 7 channel receiver with telemetry ?

Hello, I have tried to use the data mavlink from a Pixhawk flight control over a Walkera RX 709 Receiver. Unfortunately no telemetry is displayed on my FS. I suspect walkera does not use the normal mavlink protocol.
Which receiver with PPM from another manufacturer I could use to display telemetry data on my Devo 10 ?
Regards HAL