Pixhawk connection error with raspberry pi | MAV> Detected vehicle 1:1 on link 0

~ $ mavproxy.py --master=/dev/ttyAMA0 --baudrate 57600 --aircraft MyCopter
Connect /dev/ttyAMA0 source_system=255
no script MyCopter/mavinit.scr
Log Directory: MyCopter/logs/2024-09-20/flight6
Telemetry log: MyCopter/logs/2024-09-20/flight6/flight.tlog
Waiting for heartbeat from /dev/ttyAMA0
MAV> Detected vehicle 1:1 on link 0
online system 1
STABILIZE> Mode STABILIZE

After this message, commands are not sent to the vehicle. I am sure that the wiring is correct, I have never received such an error before. I edited the config.txt file correctly on Raspberry. On Pixhawk, serial_4 is set to protocol 2.

Thanks for your help