Override RC Input values

Because I’m having issue with mavlink to RC_Override, it seems uart0 on apm2.8 did not work, i got no voltage between GND and Rx0 nor Tx0. So I think Can i use Arduino as Bridge between PWM input and Receiver ? Receiver -> arduino -> input. Arduino will read the value of receiver and put pwm output to APM RC input. If this is possible please let me know. Thanks