adotagarwal/rpi-network-watchdog.sh

## rpi-network-watchdog.sh
#!/bin/bash
#
# Original Source Attribution:
# Location: https://gist.github.com/SandroMachado/87e591fc42f368636b251b566485ae46
# Author: Sandro Machado
# Date of retrieval: 2020-01-25
#
# Script Summary:
# This script checks a pingable source and when the failure
# limit is reached the host is restarted.  No files are written
# to with this script.
#
# This script is intended to be ran via cron with the @reboot
# (see man 5 crontab) option so that it runs once at startup and
# continues execution in an infinite loop until a reboot
# condition is reached.
#
# Modifications the original source are made under the following license:
#
# MIT License
#
# Copyright (c) 2020 Austin Agarwal
# Copyright (c) 2019 Tyler B. Long
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#

####################
# Configurations
####################

# The interval [sec] to check the pingable destination for connectivity.
check_interval=30

# The public or local resource to ping.
ping_destination=google.com

# The number of ping packets to send.
ping_count=3

# The consecutive max ping failure count. When reached a reboot is invoked.
max_ping_failures=5

####################
# Main
####################

failure_count=0

while true
do

    # test the pingable resource
    ping -c $ping_count $ping_destination > /dev/null 2>&1

    # check exit status of ping command
    if [[ $? -eq 0 ]]; then
        failure_count=0
        echo 'All good as of:' $(date)
    else
        failure_count=$((failure_count+1))
        echo 'Network failure at:' $(date)
        if ((failure_count >= max_ping_failures)); then
            echo 'Recovering network stack at:' $(date)
            sudo ifdown wlan0
            sleep 5
            sudo modprobe -r brcmfmac
            sleep 1
            sudo modprobe brcmfmac
            sleep 5
            sudo ifup wlan0
            failure_count=0
            sleep 5
        fi
    fi

    sleep $check_interval

done
	#!/bin/bash
	#
	# Original Source Attribution:
	# Location: https://gist.github.com/SandroMachado/87e591fc42f368636b251b566485ae46
	# Author: Sandro Machado
	# Date of retrieval: 2020-01-25
	#
	# Script Summary:
	# This script checks a pingable source and when the failure
	# limit is reached the host is restarted. No files are written
	# to with this script.
	#
	# This script is intended to be ran via cron with the @reboot
	# (see man 5 crontab) option so that it runs once at startup and
	# continues execution in an infinite loop until a reboot
	# condition is reached.
	#
	# Modifications the original source are made under the following license:
	#
	# MIT License
	#
	# Copyright (c) 2020 Austin Agarwal
	# Copyright (c) 2019 Tyler B. Long
	#
	# Permission is hereby granted, free of charge, to any person obtaining a copy
	# of this software and associated documentation files (the "Software"), to deal
	# in the Software without restriction, including without limitation the rights
	# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	# copies of the Software, and to permit persons to whom the Software is
	# furnished to do so, subject to the following conditions:
	#
	# The above copyright notice and this permission notice shall be included in all
	# copies or substantial portions of the Software.
	#
	# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	# SOFTWARE.
	#

	####################
	# Configurations
	####################

	# The interval [sec] to check the pingable destination for connectivity.
	check_interval=30

	# The public or local resource to ping.
	ping_destination=google.com

	# The number of ping packets to send.
	ping_count=3

	# The consecutive max ping failure count. When reached a reboot is invoked.
	max_ping_failures=5

	####################
	# Main
	####################

	failure_count=0

	while true
	do

	# test the pingable resource
	ping -c $ping_count $ping_destination > /dev/null 2>&1

	# check exit status of ping command
	if [[ $? -eq 0 ]]; then
	failure_count=0
	echo 'All good as of:' $(date)
	else
	failure_count=$((failure_count+1))
	echo 'Network failure at:' $(date)
	if ((failure_count >= max_ping_failures)); then
	echo 'Recovering network stack at:' $(date)
	sudo ifdown wlan0
	sleep 5
	sudo modprobe -r brcmfmac
	sleep 1
	sudo modprobe brcmfmac
	sleep 5
	sudo ifup wlan0
	failure_count=0
	sleep 5
	fi
	fi

	sleep $check_interval

	done