new_contents: import RPi.GPIO as GPIO
  import rospy
  from std_msgs import Bool
  from diagnostic_msgs import DiagnosticArray
  
  CHANNEL =
  
  def publish():
  	leakPub = rospy.Publisher('Leak', Bool, queue_size=1)
  	diagPub = rospy.Publisher('/diagnostic', DiagnosticArray)
  	rospy.init_node('Leak')
  	GPIO.setup(CHANNEL, GPIO.IN)
  	freq = rospy.Rate(1)
  	leak = Bool()
  	pub = rospy.Publisher('/diagnostics', DiagnosticArray, queue_size=1)
  	diag = DiagnosticArray()
  	while not rospy.is_shutdown():
  		levelData=0
  		if (leak.data):
  			diag.status[0].level=2
  		diag.status = [DiagnosticStatus(name='Leak', message=str(leak.data), level=levelData]
  		leak.data = GPIO.input(CHANNEL)
  		leakPub.publish(leak)
  		diagPub.publish(diag)
  		freq.sleep()
  
  if __name__ == '__main__':
  	try:
  		publish()
  	except rospy.ROSInterruptException:
  		pass
  
subject: Complete leak sensor code