Returns the json string from the Hydrawise server after calling
    statusschedule.php.

    :param token: The users API token.
    :type token: string
    :returns: The response from the controller. If there was an error returns
              None.
    :rtype: string or None

def status_schedule(token):
    """
    Returns the json string from the Hydrawise server after calling
    statusschedule.php.

    :param token: The users API token.
    :type token: string
    :returns: The response from the controller. If there was an error returns
              None.
    :rtype: string or None
    """

    url = 'https://app.hydrawise.com/api/v1/statusschedule.php'

    payload = {
        'api_key': token,
        'hours': 168}

    get_response = requests.get(url, params=payload, timeout=REQUESTS_TIMEOUT)

    if get_response.status_code == 200 and \
       'error_msg' not in get_response.json():
        return get_response.json()

    return None