human
I wrote the below code

    from pyhomematic import HMConnection
    hass.data[DATA_DELAY] = config[DOMAIN].get(CONF_DELAY)
    hass.data[DATA_DEVINIT] = {}
    hass.data[DATA_STORE] = set()
    remotes = {}
    hosts = {}
    for (rname, rconfig) in config[DOMAIN][CONF_HOSTS].items():
        server = rconfig.get(CONF_IP)
        remotes[rname] = {}
        remotes[rname][CONF_IP] = server
        remotes[rname][CONF_PORT] = rconfig.get(CONF_PORT)
        remotes[rname][CONF_RESOLVENAMES] = rconfig.get(CONF_RESOLVENAMES)
        remotes[rname][CONF_USERNAME] = rconfig.get(CONF_USERNAME)
        remotes[rname][CONF_PASSWORD] = rconfig.get(CONF_PASSWORD)
        remotes[rname]['callbackip'] = rconfig.get(CONF_CALLBACK_IP)
        remotes[rname]['callbackport'] = rconfig.get(CONF_CALLBACK_PORT)
        if ((server not in hosts) or rconfig.get(CONF_PRIMARY)):
            hosts[server] = {CONF_VARIABLES: rconfig.get(CONF_VARIABLES), CONF_NAME: rname}
        hass.data[DATA_DEVINIT][rname] = rconfig.get(CONF_DEVICES)
    bound_system_callback = partial(_system_callback_handler, hass, config)
    hass.data[DATA_HOMEMATIC] = HMConnection(local=config[DOMAIN].get(CONF_LOCAL_IP), localport=config[DOMAIN].get(CONF_LOCAL_PORT), remotes=remotes, systemcallback=bound_system_callback, interface_id='homeassistant')
    hass.data[DATA_HOMEMATIC].start()
    hass.bus.listen_once(EVENT_HOMEASSISTANT_STOP, hass.data[DATA_HOMEMATIC].stop)
    entity_hubs = []
    for (_, hub_data) in hosts.items():
        entity_hubs.append(HMHub(hass, hub_data[CONF_NAME], hub_data[CONF_VARIABLES]))
    descriptions = load_yaml_config_file(os.path.join(os.path.dirname(__file__), 'services.yaml'))
    def _hm_service_virtualkey(service):
        'Service    to    handle    virtualkey    servicecalls.'
        address = service.data.get(ATTR_ADDRESS)
        channel = service.data.get(ATTR_CHANNEL)
        param = service.data.get(ATTR_PARAM)
        hmdevice = _device_from_servicecall(hass, service)
        if (hmdevice is None):
            _LOGGER.error('%s    not   ...

What's a good function header?
assistant
#Here's a good function header.

def setup(hass, config):