rospy getting two publishers

edit

Hi All,

I have a two or more nodes publishing in the diagnostic topic.

roman@roman-virtual-machine1:~/nagios$ rostopic info diagnostics
Type: diagnostic_msgs/DiagnosticArray

Publishers: 
 * /mobile_base_nodelet_manager (http://roman-virtual-machine1:35669/)
 * /play_1410810684593700345 (http://roman-virtual-machine1:40540/)

I am trying to read all Publishers information but when I use rospy I get only one Publisher at the time.

def listener():
    #rospy.init_node('check_battery_kobuki', anonymous=True,  disable_signals=True, log_level=rospy.DEBUG)
    rospy.init_node('ros_diagnostics', anonymous=True,  disable_signals=True)
    rospy.Subscriber("diagnostics", DiagnosticArray , callback_kobuki)
    rospy.spin()

Is there a way to get all Publishers in the same connection ?

Thanks in advance, Felipe Roman