wifimon.py

# Monitor Wi-Fi signal on Linux (Debian)

import subprocess
import time


IS_TESTING_ON_MACOS = False
SLEEP_SECS = 60


def check_wlan():
    d = {}

    p = subprocess.run(
        ["curl", "-s", "http://google.com"], capture_output=True, encoding="UTF-8"
    )
    google_com = p.returncode == 0
    d["google_reachable"] = "1" if google_com else "0"

    if IS_TESTING_ON_MACOS:
        p = subprocess.run(["cat", "nmcli-g"], capture_output=True, encoding="UTF-8")
    else:
        p = subprocess.run(["nmcli", "-t", "g"], capture_output=True, encoding="UTF-8")
    line = p.stdout
    nmcli_global_components = line.split(":")
    d["state"] = nmcli_global_components.pop(0)
    d["connectivity"] = nmcli_global_components.pop(0)

    if IS_TESTING_ON_MACOS:
        path = "wireless"
    else:
        path = "/proc/net/wireless"
    with open(path) as f:
        lines = f.readlines()
    line = lines[2]
    proc_net_wireless_components = line.split()
    d["ifname"] = proc_net_wireless_components.pop(0).strip(":")
    d["status"] = proc_net_wireless_components.pop(0)
    d["quality"] = proc_net_wireless_components.pop(0).strip(".")
    d["signal"] = proc_net_wireless_components.pop(0).strip(".")
    d["noise"] = proc_net_wireless_components.pop(0)
    d["discarded_nwid"] = proc_net_wireless_components.pop(0)
    d["discarded_crypt"] = proc_net_wireless_components.pop(0)
    d["discarded_frag"] = proc_net_wireless_components.pop(0)
    d["discarded_misc"] = proc_net_wireless_components.pop(0)

    print(", ".join([f"{k}={v}" for k, v in d.items()]))


while True:
    check_wlan()
    time.sleep(SLEEP_SECS)