Mikrotik (RouterOS) - Reset LTE if no ping

WAN_Watchdog.rsc

# External network (WAN) connection watchdog
#
# Tested and works in RouterOS 6.49.17 (stable)
#
# If device gets 10 unsuccessfull pings to all ips in $pingAdresses array, it will try to restart the
# LTE modem and its interface - multiple times (RebootThreshold - ResetThreshold), until the
# RebootThreshold is met. Then the device reboots completely.
#
# How to kill the routeros script/job?
# With terminal:
# /system/script/job/print
# /system/script/job/remove <N>
# Or with GUI:
# System > Scripts > Jobs > Select Job and click minus button
#
# Do not forget to automatically start the script after device boot:
# With terminal:
# /system/scheduler add name=WAN_Watchdog on-event=WAN_Watchdog start-time=startup interval=0 disabled=no
# or with GUI:
# System > Scheduler > click plus button and fill the fields accordingly

# Global do-while loop condition variable - it's possible to stop whole script by setting this variable to "false" in the terminal.
:global WANWatchdogEnable true;

# USB-Reset duration time
:global PowerResetTime "10s";

# If connection problems persist and the (PingCount = RebootThreshold) the device reboots.
:global RebootThreshold 15;

#How often to check WAN connectivity
:global CheckInterval "30s";

# Threshold when the device tries to USB-reset the LTE modem and its interface.
:local ResetThreshold 10;
:local PingCount 0;

# Name of PPoe LTE interface
:local WANInterface "lte1";

# Array with well-known DNS addresses to ping.
# It is recommended to choose more than just one address to prevent false detections in case of DNS provider failure.
#
# "77.88.8.8"; # Yandex DNS (1st)
# "77.88.8.1"; # Yandex DNS (2nd)
# "1.1.1.1"; # Cloudflare DNS (1st)
# "1.0.0.1"; # Cloudflare DNS (2nd)
# "8.8.8.8"; # Google DNS (1st)
# "8.8.4.4"; # Google DNS (2nd)
#
# You may use local addresses for debugging purposes
# :global PingAddresses {"192.168.5.1"; "192.168.5.17"; "192.168.5.17"};

:global PingAddresses {"77.88.8.1"; "1.1.1.1"; "8.8.8.8"};

:log info "WAN_Watchdog: PingAddresses: $([:tostr $PingAddresses])";

:local WANConnection do={
    :global PingAddresses;
    :local Counter 0;
    :foreach Address in=$PingAddresses do={
        :set Counter ($Counter + 1);
        :if [/ping address=$Address count=1 size=64] do={
            :return true
        } else={
            :if ([:len $PingAddresses] = $Counter) do={
                :return false
                }
            }
    }
}


# At first, wait until the device boots up and everything (especially LTE modem) will try to initialize
:log info "WAN_Watchdog: Waiting on initial delay...";
:delay 300s;

:do {
    # Every $CheckInterval seconds check the connection, reset or increment the PingCount if connection fails.
    :delay $CheckInterval;

    :if [$WANConnection] do={
        # Reset the ping counter
        :set PingCount 0;
        :log info "WAN_Watchdog: Network is OK.";
    } else={
        :set PingCount ($PingCount + 1);
        :log warning "WAN_Watchdog: Unable to ping all ips from the PingAddresses, incrementing the ping counter: $PingCount";
    }

    :if ($PingCount >= $ResetThreshold) do={
        :log error "WAN_Watchdog: Network failure detected. Resetting USB interface...";

        /interface disable $WANInterface;
        :delay 5s;

        /system routerboard usb power-reset duration=$PowerResetTime;
        :delay $PowerResetTime;
        :log warning "WAN_Watchdog: USB Power reset complete.";

        # Wait for the LTE modem to boot up
        :delay 60s;

        /interface enable $WANInterface;

        # Wait for the LTE interface to initialize
        :delay 150s;
        :log warning "WAN_Watchdog: Testing if device got the network after USB reset...";

        :if [$WANConnection] do={
            :log info "WAN_Watchdog: Network connectivity restored after USB reset. Resetting the ping counter.";
            :set PingCount 0;
        } else={
            :log warning "WAN_Watchdog: Network still not available after USB reset. Checking reboot threshold: [PingCount=$PingCount, RebootThreshold=$RebootThreshold]";

            :if ($PingCount = $RebootThreshold) do={
                :log warning "WAN_Watchdog: Rebooting device due to prolonged network failure (reached the reboot threshold).";
                /system reboot;
        }
    }
    }
} while=( $WANWatchdogEnable );

Thanks for the script! Working perfectly on ROS 7.18.