Automatically restart network manager in case of connection timeouts due to wifi problems

restart-network_manager.sh

#!/bin/bash

#############################################################
#
# Restarts the Network Manager automatically when the
# Network disconnects, because of wifi connectivity problem
#
#############################################################

# Function which checks for the root user execution
root_checker() {
  # Checks if the script is ran by the root user
  if [ $EUID -ne 0 ]
  then
    echo -e "\nPlease run as root user!!!!!!!!!!!!!!!!!!!!!!!\n"
    exit 1
  fi
}

# Exits the Program
die() {
  echo -e "\nBye bye!!!!!!!!!!!!!!!\n"
  exit 0
}

# Traps the signal SIGINT
trap 'die' SIGINT

# Main flow of Execution
main() {
  # Variable Declarations
  local max_timeout_to_determine_conn_not_available=3
  local consecutive_timeouts=0

  # Ensures the script is executed with sudo persmission
  root_checker

  while :
  do
    ping -c3 google.com
    if [ $? -ne 0 ]
    then
      consecutive_timeouts=`expr $consecutive_timeouts + 1`
      if [ $consecutive_timeouts  -gt  $max_timeout_to_determine_conn_not_available ]
      then
        echo -e "\n\a\aConnection is not available!!!!!!!!!!!!!!!\n\a"
        exit 1
      fi
      systemctl restart network-manager
      sleep 20
    else
      consecutive_timeouts=0
      :
    fi
  done
}

# Starts the main flow
main

exit 0