Serial connection and g-code sending to CNC

cnc_mover.py

import time
from serial import Serial
from serial.tools import list_ports
from tqdm import tqdm
from contextlib import closing

# TODO: arg parse for port and baudrate
# TODO: arg parse for X/Y coordinates and to select initial home machine,  just unlock, or none (if machine is already unlocked)

x = 20
y = 20
z=0

codes = [
    "$X ; Unlock the machine (if locked)",
    "G92 X0 Y0 Z0 ; Set current position as zero"
    "G90 ; Absolute positioning mode",
    "G21 ; Set units to millimeters",
    "G17 ; Select XY plane",
    f'G1 X{x} Y{y} Z{z} F1000 ; Move to initial position (X={x}, Y={y})',
]

# codes = [ "$H"]

print("Codes to be sent:")
for code in codes:
    print(f"  {code}")


def list_serial_ports():
    return [p.device for p in list_ports.comports()]

def send_and_wait_ok(ser, line, timeout=15):
    ser.write((line.strip() + '\n').encode())
    deadline = time.time() + timeout
    while time.time() < deadline:
        resp = ser.readline().decode('ascii', errors='ignore').strip()
        if resp:
            print(f"<- {resp}")
            if resp.lower().startswith('ok'):
                return True
    raise RuntimeError(f"No OK received for: {line}")

if __name__ == '__main__':
    ports = list_serial_ports()
    print("Available ports:", ports)
    port = '/dev/tty.usbmodem11101'  # pick one from the list

    try:
        with closing(Serial(port, baudrate=115200, timeout=0.1)) as s:
            # wake/reset & consume banner
            s.write(b"\r\n\r\n")
            time.sleep(2)
            while True:
                line = s.readline().decode('ascii', errors='ignore').strip()
                if not line:
                    break
                print(f"<- {line}")

            for code in tqdm(codes, unit=" cmd", ncols=100):
                if not code.strip() or code.strip().startswith(';'):
                    continue
                tqdm.write(f">> {code}")
                send_and_wait_ok(s, code)

        print("\nAll codes have been sent successfully. 🎉")

    except Exception as e:
        print("Serial error:", e)