#!/usr/bin/env python3
"""Execute command on J1900 via serial console."""
import serial, time, sys

PORT = "/dev/ttyUSB0"
BAUD = 115200

def main():
    if len(sys.argv) < 2:
        print(f"Usage: {sys.argv[0]} <command>")
        sys.exit(1)

    cmd = " ".join(sys.argv[1:])
    ser = serial.Serial(PORT, BAUD, timeout=0.5)
    ser.reset_input_buffer()

    ser.write((cmd + "\r").encode())
    time.sleep(3)

    out = b""
    while True:
        chunk = ser.read(4096)
        if not chunk:
            break
        out += chunk

    ser.close()
    print(out.decode("utf-8", errors="replace"))

if __name__ == "__main__":
    main()