The Industrial Raspberry Pi Forum

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# -*- coding: utf-8 -*-
"""Ping IP addresses and set an IO to True on failure."""
__author__ = "Sven Sager"
__copyright__ = "Copyright (C) 2019 Sven Sager"
__license__ = "GPLv3"
import revpimodio2
from os import system
from threading import Event

# Event to exit the while loop
evt_exit = Event()

# RevPiModIO to communicate to process image
rpi = revpimodio2.RevPiModIO(autorefresh=True)
rpi.handlesignalend(evt_exit.set)

# This is our IP - Output-List
# TODO: CHANGE THIS TO YOUR NEEDS !!!
ip_io = {
    "127.0.0.1": "O_12",
    "192.168.1.1": "O_13",
    "192.168.1.55": "O_14",
}

# Our mainloop - Executed every 5 seconds - Exit with Ctrl+C
while not evt_exit.wait(5):

    # This is our ip check
    for ip in ip_io:
        # Do the Ping - Return code 0 = success
        exit_code = system("ping -c 1 {0}".format(ip))
        
        # Bool value of IO will the set to True on error
        rpi.io[ip_io[ip]].value = exit_code

# Clean up process image
rpi.cleanup()

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rpi.io[ip_io[ip]].value = exit_code

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rpi.io[ip_io[ip]].value != exit_code