pingcheck v5 ok

root@OpenWrt:~# cat /etc/config/network | grep endpoint_host
        option endpoint_host 'sg480.nordvpn.com'
###################
root@OpenWrt:~# ping -I nordlynx 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=120 time=62.774 ms
64 bytes from 8.8.8.8: seq=1 ttl=120 time=62.782 ms
64 bytes from 8.8.8.8: seq=2 ttl=120 time=62.639 ms
^C
--- 8.8.8.8 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 62.639/62.731/62.782 ms
###################
root@OpenWrt:~# cat ./pingv5.sh
#!/bin/sh

check_ping () {
  server="$1"
  interface="$2"
  count=0
  while [ "$count" -lt 5 ]; do
    ping_output=$(ping "$server" -c 1 -I "$interface" -W 5)
    ping_time=$(printf "%.0f" "$(echo "$ping_output" | grep 'time=' | awk -F 'time=' '{print $2}' | awk '{print $1}')")
    if [ -n "$ping_time" ] && [ "$ping_time" -gt 0 ]; then
      break
    fi
    count=$((count+1))
    sleep 1
  done
}

find_fastest_server () {
  server_list="/etc/servers"
  fastest_ping=100
  fastest_server=
  interface="br-lan"
  while IFS= read -r server; do
    echo "Checking server: $server"
    check_ping "$server" "$interface" &>/dev/null
    if [ "$ping_time" -lt "$fastest_ping" ]; then
      fastest_server="$server"
      fastest_ping="$ping_time"
    fi
  done < "$server_list"
}

ifname="nordlynx"
echo "Pinging..."
check_ping "8.8.8.8" "$ifname" &>/dev/null
echo "Current ping: $ping_time ms"

# Check if VPN ping is lower than 50ms
if [ ! "$ping_time" -eq 0 ] && [ "$ping_time" -lt 50 ]; then
  exit 0
else
  find_fastest_server
  echo "Fastest server: $fastest_server"
  echo "Fastest ping: $fastest_ping ms"
  if [ -n "$fastest_server" ] && [ ! "$fastest_ping" -eq 0 ]; then
    uci set network.@wireguard_${ifname}[-1].endpoint_host="$fastest_server"
    uci commit network
    /etc/init.d/network restart
  else
    exit 0
  fi
fi
exit 0
###################
root@OpenWrt:~# ./pingv5.sh
Pinging...
Current ping: 63 ms
Checking server: sg455.nordvpn.com
Checking server: sg456.nordvpn.com
Checking server: sg457.nordvpn.com
Checking server: sg458.nordvpn.com
Checking server: sg459.nordvpn.com
Checking server: sg460.nordvpn.com
Checking server: sg461.nordvpn.com
Checking server: sg462.nordvpn.com
Checking server: sg463.nordvpn.com
Checking server: sg490.nordvpn.com
Checking server: sg491.nordvpn.com
Checking server: sg493.nordvpn.com
Checking server: sg494.nordvpn.com
Checking server: sg507.nordvpn.com
Checking server: sg508.nordvpn.com
Fastest server: sg457.nordvpn.com
Fastest ping: 29 ms
'radio0' is disabled
###################
root@OpenWrt:~# cat /etc/config/network | grep endpoint_host
        option endpoint_host 'sg457.nordvpn.com'
###################
root@OpenWrt:~# ping -I nordlynx 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=117 time=35.840 ms
64 bytes from 8.8.8.8: seq=1 ttl=117 time=35.564 ms
64 bytes from 8.8.8.8: seq=2 ttl=117 time=35.586 ms
64 bytes from 8.8.8.8: seq=3 ttl=117 time=35.443 ms
^C
--- 8.8.8.8 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 35.443/35.608/35.840 ms
root@OpenWrt:~#