Signal Strength Logging on Mac

signal_strength.py

import subprocess
import time


def get_wifi_rssi():
    # Command to get WiFi details, you can just call this actually if you want all the deets. system_profiler SPAirPortDataType
    command = ["system_profiler", "SPAirPortDataType"]

    # Executing the command with all outputs suppressed, otherwise it'll output it in the terminal still
    result = subprocess.run(
        command, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, text=True
    )

    if result.returncode == 0:

        lines = result.stdout.split("\n")
        for line in lines:
            if "Signal / Noise:" in line:
                signal_noise = line.split(":")[1].strip()
                split_on_slash = signal_noise.split("/")

                signal_value_without_dbm = int(split_on_slash[0].strip().split(" ")[0])
                noise_value_without_dbm = int(split_on_slash[1].strip().split(" ")[0])


                signal_strength = signal_value_without_dbm - noise_value_without_dbm

                return line, signal_strength
    else:
        print("Failed to execute command")
        return None


if __name__ == "__main__":
    while True:
        result = get_wifi_rssi()
        signal_noise = result[0]
        signal_strength = result[1]
        print(
            "📡 " + signal_noise.strip() + ", signal strength: " + str(signal_strength)
        )

        now = time.strftime("%Y-%m-%d %H:%M:%S")


        with open("signal_strength.csv", "a") as f:
            f.write(now + "," + str(signal_strength) + "\n")

        time.sleep(1)