Actually gets Google Home's bluetooth to connect reliably on Windows 10. Fixes pairing issues, stuck paired issue and just makes the whole process a lot less awful.

google-home-bluetooth-windows-10-repair.py

# Actually gets Google Home's bluetooth to connect reliably on Windows 10.
# Unpairs Windows AND Google Home using MAC address, then sets everything up for a one-click connection.

# * Prevents Google Home from getting stuck paried using bttool, which is apparently the only way to fix that?
# * Uses some code from Stack Overflow to get the IP from the MAC address so you don't have to dick around with static IP's
# * Connects reliably by repairing bluetooth on Google Home using the "secret" REST API (https://rithvikvibhu.github.io/GHLocalApi)
# * Opens control legacy panel after setting up Google for pairing

#
# Needs btpair installed first, get it from http://bluetoothinstaller.com/bluetooth-command-line-tools/
# Also needs "requests", do `pip install requests`
#
#  @author Benjamin Gwynn <[email protected]>

import os
import requests # pip install requests (or pipenv if you're into that kind of thing)
import sys
import ctypes
import subprocess

# by the way this is for windows only, if you're using linux or macos just do something else.

# 99% sure all python is copy-pasted from the internet, https://stackoverflow.com/a/41930586
def is_admin():
    try:
        return ctypes.windll.shell32.IsUserAnAdmin()
    except:
        return False

# more code copied from stack overflow https://stackoverflow.com/a/56022769
def find_ip(mac):
    macstr = mac.replace(":", '-') # apparently you can't use ':', you have to use '-' for ARP, la dee da.
    cmd = 'arp -a | findstr "' + macstr + '" '
    returned_output = subprocess.check_output((cmd),shell=True,stderr=subprocess.STDOUT)
    parse=str(returned_output).split(' ',1)
    ip=parse[1].split(' ')
    return ip[1]

# spit out usage errors
if (sys.argv.count < 2):
    print("usage " + sys.argv[0] + " <google home mac address>")
    print("- you can find the mac address on the bottom of the device settings on the Google Home app")
    exit(1)
    
mac = sys.argv[1].lower() # lower case is important for correct ARP lookup in find_ip.
print("Google Home MAC Address: " + mac)
ip = find_ip(mac)
print("Google Home IP: " + ip)

if is_admin():
    # btpair requires admin.
    print("Hey, you're an admin, that's great!")
    print("Unpairing Windows Bluetooth devices...")
    os.system("btpair -u") # why not btpair -u with a specific mac? because it doesn't work, try it.
else:
    print("\n!! You must be an admin to run this script!\n\n* Why? The btpair program needs it to unpair devices RELIABLY, unlike Control Panel which always does so at user-level, causing devices to get stuck. Please check the source code before running this as an admin to ensure it has not been tampered with.\n")
    exit(1)

# this is done using https://rithvikvibhu.github.io/GHLocalApi/#bluetooth-bluetooth-bond-post
print("Forgetting paired devices on Google Home...")
requests.post("http://" + ip + ":8008/setup/bluetooth/bond", headers={"Content-Type": "application/json"})

print("Setting Google Home to discoverable...")
requests.post("http://" + ip + ":8008/setup/bluetooth/discovery", headers={"Content-Type": "application/json"})

print("Trying to use btpair to connect, this NEVER works for me, but might for you...")
os.system("btpair -p -b " + mac)

print("Opening the legacy Bluetooth panel (fun-fact: you can close this panel after the device starts to install!)")
os.system("DevicePairingWizard.exe")