@property
def destination(self):
    if ((self.ip is None) and (self.port is None)):
        return None
    destination = '{0}:{1}'.format(self.ip, self.port)
    return destination
@property
def destination(self):
    if ((self.ip is None) and (self.port is None)):
        return None
    destination = '{0}:{1}'.format(self.ip, self.port)
    return destination