import serial
import time

try:
    puerto = serial.Serial('/dev/ttyAMA0', 921600, timeout=1.0)
    print("Enviando A:0.500,0.500,0.500,0.500")
    puerto.write(b"A:0.500,0.500,0.500,0.500\n")
    time.sleep(2)
    puerto.write(b"S:\n")
    print("Stop enviado.")
except Exception as e:
    print("Error:", e)