ros arduino test

#!/usr/bin/env python
from re import T
import rospy
from std_srvs.srv import *
from sensor_msgs.msg import LaserScan
import numpy as np

class testArduinoService(object):
    def __init__(self):
        self.test_client = rospy.ServiceProxy("test_srv2", Trigger)
        self.trig_req = TriggerRequest()
        self.trig_res = TriggerResponse()
        self.subs_lidar = rospy.Subscriber("scan", LaserScan, self.get_scan_data)
        self.scan = None

    def get_scan_data(self, scan):
        self.scan = np.array(scan)

if __name__=="__main__":
    rospy.init_node("get_service")
    testArduinoService().do_req()