Check if a bluetooth device is connected or not on macOS

check_bluetooth_connection.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
Check if a bluetooth device is connected or not on macOS.

Command-line usage:
$ python check_bluetooth_connection.py bluetooth_device_name

Library usage:
from check_bluetooth_connection import check_bluetooth_connection
is_connected = check_bluetooth_connection(device_name)
"""

import sys
import subprocess

PY3K = sys.version_info >= (3, 0)
if PY3K:
    from plistlib import loads as read_plist_from_string
else:
    from plistlib import readPlistFromString as read_plist_from_string


def check_bluetooth_connection(device_name):
    output = subprocess.check_output(["system_profiler",
                                      "-xml",
                                      "-detailLevel",
                                      "basic",
                                      "SPBluetoothDataType"])

    plist = read_plist_from_string(output)
    devices = plist[0]['_items'][0]['device_title']

    for d in devices:
        if device_name in d.keys():
            device_info = d[device_name]
            break
    else:
        msg = u"\"{}\" not found".format(device_name)
        if not PY3K:
            msg = msg.encode('utf-8')
        raise ValueError(msg)

    if device_info['device_isconnected'] == "attrib_Yes":
        return True
    else:
        return False


def main():
    if len(sys.argv) <= 1:
        print("Usage: python check_bluetooth_connection.py "
              "bluetooth_device_name")
        return

    device_name = sys.argv[1]
    if not PY3K:
        device_name = device_name.decode('utf-8')

    try:
        is_connected = check_bluetooth_connection(device_name)
    except (OSError, subprocess.CalledProcessError) as e:
        print(e)
        print("----")
        print("Failed to run \"system_profiler -xml -detailLevel basic "
              "SPBluetoothDataType\"")
        sys.exit(1)
    except ValueError as e:
        print(e)
        sys.exit(1)

    if is_connected:
        print("Connected")
    else:
        print("Disconnected")


if __name__ == '__main__':
    main()