```python

import os
from datetime import timedelta

from homeassistant import auth, core, config as conf_util

CLIENT_ID = 'long_lived_client'
LIFE_TIME = timedelta(days=3650)


async def create_refresh_token(auth_mgr: auth.AuthManager,
                               owner: auth.models.User):
    """Create a refresh token for owner."""
    refresh_token = auth.models.RefreshToken(
        user=owner,
        access_token_expiration=LIFE_TIME,
        client_id=CLIENT_ID,
    )
    owner.refresh_tokens[refresh_token.id] = refresh_token

    # hack code to save refresh_token
    await auth_mgr._store._store.async_save(
        auth_mgr._store._data_to_save())

    print('Created a new refresh token for {}: {}'.format(
        CLIENT_ID, refresh_token.id))
    return refresh_token


async def get_long_live_access_token(auth_mgr: auth.AuthManager):
    """Create a bearer token for owner."""
    owner = [u for u in await auth_mgr.async_get_users() if u.is_owner][0]
    print('Owner name is {}\n'.format(owner.name))

    refresh_token = None
    for token in owner.refresh_tokens.values():
        if token.client_id == CLIENT_ID:
            refresh_token = token
            break

    if not refresh_token:
        refresh_token = await create_refresh_token(auth_mgr, owner)

    # get access_token, it won't saved
    access_token = auth_mgr.async_create_access_token(refresh_token)
    print('Add following HTTP header to your REST API'
          ' and Websocket API request:')
    print('Authorization: Bearer {}'.format(access_token))


# change to your config path
config_dir = conf_util.get_default_config_dir()
config_path = conf_util.ensure_config_exists(config_dir)
print('Loading config from {}'.format(config_path))
config_dict = conf_util.load_yaml_config_file(config_path)
core_config = config_dict.get('homeassistant', {})

hass = core.HomeAssistant()
hass.config.config_dir = os.path.abspath(os.path.dirname(config_path))
hass.loop.run_until_complete(
    conf_util.async_process_ha_core_config(
        hass, core_config, False, False))
hass.loop.run_until_complete(
    get_long_live_access_token(hass.auth))

```