'Initialize the proximity.'

def __init__(self, hass, zone_friendly_name, dist_to, dir_of_travel, nearest, ignored_zones, proximity_devices, tolerance, proximity_zone, unit_of_measurement):

    self.hass = hass
    self.friendly_name = zone_friendly_name
    self.dist_to = dist_to
    self.dir_of_travel = dir_of_travel
    self.nearest = nearest
    self.ignored_zones = ignored_zones
    self.proximity_devices = proximity_devices
    self.tolerance = tolerance
    self.proximity_zone = proximity_zone
    self._unit_of_measurement = unit_of_measurement
