Arducopter connect with Raspberry Pi

Hello I have a problem connecting Raspberry with Arducopter ( APM2.8 )
I have raspberry PI 2 model B I have installed all things like a tutorial.
https://ardupilot.org/dev/docs/raspberry-pi-via-mavlink.html

I need to make like this example
https://drones.stackexchange.com/questions/1293/serial-communication-not-working-in-apm-2-8
https://www.youtube.com/watch?v=ADphg7bjKow&ab_channel=Aeronaughties
https://research.nccgroup.com/wp-content/uploads/2020/07/ncc-group-creation-of-wimap-the-wi-fi-mapping-drone.pdf
https://www.instructables.com/Autonomous-Line-Follower-Drone-With-Raspberry-Pi/

Etc...