def __init__(self, base_url):
self.base_url = base_url<EOL>self.devices = []<EOL>self.scenes = []<EOL>self.temperature_units = '<STR_LIT:C>'<EOL>self.version = None<EOL>self.model = None<EOL>self.serial_number = None<EOL>self.device_services_map = None<EOL>self.subscription_registry = SubscriptionRegistry()<EOL>self.categories = {}<EOL>self.device_id_map = {}<EOL>
Setup Vera controller at the given URL.

        base_url: Vera API URL, eg http://vera:3480.