gateway_alive

import platform
import shlex
from subprocess import call, DEVNULL
from netifaces import gateways, AF_INET

def gateway_alive(nic="wlan0"):
    system = platform.system()
    gws = gateways().get(AF_INET, [])
    for ip, interface, default in gws:
        if interface == nic:
            if system == "Windows":
                cmd = shlex.split(f"ping -n 1 -w 1 {ip}")
            elif system == "Linux":
                cmd = shlex.split(f"ping -c1 -W1 {ip}")
            else:
                raise RuntimeError(f"{system} is not supported.")
            if call(cmd, stdout=DEVNULL, stderr=DEVNULL) == 0:
                    return True
            else:
                    return False
    return False