dashboard_aggregator.py

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#!/usr/bin/env python

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# Copyright (c) 2008, Willow Garage, Inc.
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import time
import rospy
from std_msgs.msg import Bool
from pr2_msgs.msg import PowerBoardState, PowerState, DashboardState, AccessPoint

class DashboardAggregator:
  def __init__(self):
    self.msg = DashboardState()

    # Create publisher
    self.pub = rospy.Publisher("dashboard_agg", DashboardState, queue_size=10)

    # Create subscribers
    # Circuit Breaker
    rospy.Subscriber("power_board/state", PowerBoardState, self.powerBoardCB)
    self.last_power_board_state = 0
    # Battery
    rospy.Subscriber("power_state", PowerState, self.powerCB)
    self.last_power_state = 0
    # Wireless
    rospy.Subscriber("ddwrt/accesspoint", AccessPoint, self.accessPointCB)
    self.last_access_point = 0
    # Motor State
    rospy.Subscriber("pr2_etherCAT/motors_halted", Bool, self.motorsHaltedCB)
    self.last_motors_halted = 0

  def motorsHaltedCB(self, msg):
    self.last_motors_halted = time.time()
    self.msg.motors_halted = msg

  def powerBoardCB(self, msg):
    self.last_power_board_state = time.time()
    self.msg.power_board_state = msg

  def powerCB(self, msg):
    self.last_power_state = time.time()
    self.msg.power_state = msg

  def accessPointCB(self, msg):
    self.last_access_point = time.time()
    self.msg.access_point = msg

  def publish(self):
    now = time.time()
    self.msg.motors_halted_valid = (now - self.last_motors_halted) < 3
    self.msg.power_board_state_valid = (now - self.last_power_board_state) < 3
    self.msg.power_state_valid = (now - self.last_power_state) < 25
    self.msg.access_point_valid = (now - self.last_access_point) < 5
    self.pub.publish(self.msg)

def main():
  rospy.init_node("pr2_dashboard_aggregator")
  da = DashboardAggregator()
  r = rospy.Rate(1)
  while not rospy.is_shutdown():
    da.publish()
    try:
      r.sleep()
    except rospy.exceptions.ROSInterruptException:
      rospy.logdebug('Sleep interrupted')

if __name__ == "__main__":
  main()