I'm using the rosarduino bridge package on a custom robot and i'm developing a node access the package when required. but im havin trouble callin the services in arduinobridge usin rospy.serviceproxy(' ', )

shld it be called usin another function in da client node.. i did add da dependacies in da node.

This is da code I used to call the service

#!/usr/bin/env python

import sys
import rospy
from ros_arduino_python import *
from ros_arduino_msgs.srv import *

def digital_write_client(pin, value):
  # rospy.wait_for_sevice('digital_write')
   try:
        digital_write = rospy.ServiceProxy('digital_write', DigitalWrite)
        digital_write(pin,value)
        print"call success"
   except rospy.ServiceException, e:
        print "Service call failed: %s"%e   

if __name__ == "__main__":
   digital_write_client(8,1)