Mavlink serial output

Hi, I’m trying to pass mavlink messages to an Arduino via COM port linked at the pc.
I’ve discovered the function SerialOutput in the Ctrl+f menu, but it seems to not connect.
There is a way to forward all messages received by the apm to the Arduino on the ground via some MissionPlanner functions?
Thanks to everyone

Take a look at this:

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thanks, but i’ve already used arduino linked via serial directly to the pixhawk, what i need is to get global pos int to telemetry to the external arduino.
I’ll build an antenna tracker with this data.
I saw the tcp and udp links but is more complicated for me.