[1.12.2]Gets whether the server is on or not, and displays it on GuiScreen

Hey,guys.

I want to make a new MainMenu so that I can see if my server is on when I enter the GUIMainMenu.

I'm trying to modify the

net.minecraft.client.network.ServerPinger

to create my own serverpinger.

When I use ping(serverdata server) and pass in my own serverdata, the console always says "Can't ping ...(serverIP)", although my server is connectable.

Here is the pinger code.

package mawmanager.maw.GUI;

import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.mojang.authlib.GameProfile;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelException;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.nio.NioSocketChannel;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.nio.charset.StandardCharsets;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import net.minecraft.client.Minecraft;
import net.minecraft.client.multiplayer.ServerAddress;
import net.minecraft.client.multiplayer.ServerData;
import net.minecraft.network.EnumConnectionState;
import net.minecraft.network.NetworkManager;
import net.minecraft.network.ServerStatusResponse;
import net.minecraft.network.handshake.client.C00Handshake;
import net.minecraft.network.status.INetHandlerStatusClient;
import net.minecraft.network.status.client.CPacketPing;
import net.minecraft.network.status.client.CPacketServerQuery;
import net.minecraft.network.status.server.SPacketPong;
import net.minecraft.network.status.server.SPacketServerInfo;
import net.minecraft.util.math.MathHelper;
import net.minecraft.util.text.ITextComponent;
import net.minecraft.util.text.TextComponentString;
import net.minecraft.util.text.TextComponentTranslation;
import net.minecraft.util.text.TextFormatting;
import net.minecraft.util.text.translation.I18n;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

@SideOnly(Side.CLIENT)
public class MawServerPinger
{
    private static final Splitter PING_RESPONSE_SPLITTER = Splitter.on('\u0000').limit(6);
    private static final Logger LOGGER = LogManager.getLogger();
    /** A list of NetworkManagers that have pending pings */
    private final List<NetworkManager> pingDestinations = Collections.<NetworkManager>synchronizedList(Lists.newArrayList());

    public void ping(final ServerData server) throws UnknownHostException
    {
        ServerAddress serveraddress = ServerAddress.fromString(server.serverIP);
        final NetworkManager networkmanager = NetworkManager.createNetworkManagerAndConnect(InetAddress.getByName(serveraddress.getIP()), serveraddress.getPort(), false);
        this.pingDestinations.add(networkmanager);
        server.pingToServer = -1L;
        server.playerList = null;
        networkmanager.setNetHandler(new INetHandlerStatusClient()
        {
            private boolean successful;
            private boolean receivedStatus;
            private long pingSentAt;
            public void handleServerInfo(SPacketServerInfo packetIn)
            {
                if (this.receivedStatus)
                {
                    networkmanager.closeChannel(new TextComponentTranslation("multiplayer.status.unrequested", new Object[0]));
                }
                else
                {
                    this.receivedStatus = true;
                    ServerStatusResponse serverstatusresponse = packetIn.getResponse();
                    NewMawMainGui.onlinestate =I18n.translateToLocal("mawnewmenu.mawserveronline");

                    if (serverstatusresponse.getPlayers() != null)
                    {
                        NewMawMainGui.playercount =I18n.translateToLocal("mawnewmenu.playercount")+serverstatusresponse.getPlayers().getPlayers().length;
                    }

                    net.minecraftforge.fml.client.FMLClientHandler.instance().bindServerListData(server, serverstatusresponse);
                    this.pingSentAt = Minecraft.getSystemTime();
                    networkmanager.sendPacket(new CPacketPing(this.pingSentAt));
                    this.successful = true;
                }
            }
            public void handlePong(SPacketPong packetIn)
            {
                long i = this.pingSentAt;
                long j = Minecraft.getSystemTime();
                server.pingToServer = j - i;
                networkmanager.closeChannel(new TextComponentString("Finished"));
            }
            /**
             * Invoked when disconnecting, the parameter is a ChatComponent describing the reason for termination
             */
            public void onDisconnect(ITextComponent reason)
            {
                if (!this.successful)
                {

                	NewMawMainGui.onlinestate = I18n.translateToLocal("mawnewmenu.mawserveroffline");
                	NewMawMainGui.playercount = I18n.translateToLocal("mawnewmenu.playercount")+0;
    				NewMawMainGui.server.pingToServer = -1L;
    				System.out.println("Connection error(MAWSERVER)");
                    server.serverMOTD = TextFormatting.DARK_RED + I18n.translateToLocal("multiplayer.status.cannot_connect");
                    server.populationInfo = "";
                    MawServerPinger.this.tryCompatibilityPing(server);
                }
            }
        });

        try
        {
            networkmanager.sendPacket(new C00Handshake(serveraddress.getIP(), serveraddress.getPort(), EnumConnectionState.STATUS, true));
            networkmanager.sendPacket(new CPacketServerQuery());
        }
        catch (Throwable throwable)
        {
            LOGGER.error(throwable);
        }
    }

    private void tryCompatibilityPing(final ServerData server)
    {
        final ServerAddress serveraddress = ServerAddress.fromString(server.serverIP);
        ((Bootstrap)((Bootstrap)((Bootstrap)(new Bootstrap()).group(NetworkManager.CLIENT_NIO_EVENTLOOP.getValue())).handler(new ChannelInitializer<Channel>()
        {
            protected void initChannel(Channel p_initChannel_1_) throws Exception
            {
                try
                {
                    p_initChannel_1_.config().setOption(ChannelOption.TCP_NODELAY, Boolean.valueOf(true));
                }
                catch (ChannelException var3)
                {
                    ;
                }

                p_initChannel_1_.pipeline().addLast(new SimpleChannelInboundHandler<ByteBuf>()
                {
                    public void channelActive(ChannelHandlerContext p_channelActive_1_) throws Exception
                    {
                        super.channelActive(p_channelActive_1_);
                        ByteBuf bytebuf = Unpooled.buffer();

                        try
                        {
                            bytebuf.writeByte(254);
                            bytebuf.writeByte(1);
                            bytebuf.writeByte(250);
                            char[] achar = "MC|PingHost".toCharArray();
                            bytebuf.writeShort(achar.length);

                            for (char c0 : achar)
                            {
                                bytebuf.writeChar(c0);
                            }

                            bytebuf.writeShort(7 + 2 * serveraddress.getIP().length());
                            bytebuf.writeByte(127);
                            achar = serveraddress.getIP().toCharArray();
                            bytebuf.writeShort(achar.length);

                            for (char c1 : achar)
                            {
                                bytebuf.writeChar(c1);
                            }

                            bytebuf.writeInt(serveraddress.getPort());
                            p_channelActive_1_.channel().writeAndFlush(bytebuf).addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
                        }
                        finally
                        {
                            bytebuf.release();
                        }
                    }
                    protected void channelRead0(ChannelHandlerContext p_channelRead0_1_, ByteBuf p_channelRead0_2_) throws Exception
                    {
                        short short1 = p_channelRead0_2_.readUnsignedByte();

                        if (short1 == 255)
                        {
                            String s = new String(p_channelRead0_2_.readBytes(p_channelRead0_2_.readShort() * 2).array(), StandardCharsets.UTF_16BE);
                            String[] astring = (String[])Iterables.toArray(MawServerPinger.PING_RESPONSE_SPLITTER.split(s), String.class);

                            if ("\u00a71".equals(astring[0]))
                            {
                                int i = MathHelper.getInt(astring[1], 0);
                                String s1 = astring[2];
                                String s2 = astring[3];
                                int j = MathHelper.getInt(astring[4], -1);
                                int k = MathHelper.getInt(astring[5], -1);
                                server.version = -1;
                                server.gameVersion = s1;
                                server.serverMOTD = s2;
                                server.populationInfo = TextFormatting.GRAY + "" + j + "" + TextFormatting.DARK_GRAY + "/" + TextFormatting.GRAY + k;
                            }
                        }

                        p_channelRead0_1_.close();
                    }
                    public void exceptionCaught(ChannelHandlerContext p_exceptionCaught_1_, Throwable p_exceptionCaught_2_) throws Exception
                    {
                        p_exceptionCaught_1_.close();
                    }
                });
            }
        })).channel(NioSocketChannel.class)).connect(serveraddress.getIP(), serveraddress.getPort());
    }

    public void pingPendingNetworks()
    {
        synchronized (this.pingDestinations)
        {
            Iterator<NetworkManager> iterator = this.pingDestinations.iterator();

            while (iterator.hasNext())
            {
                NetworkManager networkmanager = iterator.next();

                if (networkmanager.isChannelOpen())
                {
                    networkmanager.processReceivedPackets();
                }
                else
                {
                    iterator.remove();
                    networkmanager.checkDisconnected();
                }
            }
        }
    }

    public void clearPendingNetworks()
    {
        synchronized (this.pingDestinations)
        {
            Iterator<NetworkManager> iterator = this.pingDestinations.iterator();

            while (iterator.hasNext())
            {
                NetworkManager networkmanager = iterator.next();

                if (networkmanager.isChannelOpen())
                {
                    iterator.remove();
                    networkmanager.closeChannel(new TextComponentTranslation("multiplayer.status.cancelled", new Object[0]));
                }
            }
        }
    }
}

There is also code that is executed when a refresh Button is pressed in MainMenu

    private void check(){
    	threads.submit(new Runnable(){
    		private static final String __OBFID = "CL_00000818";
    		public void run()
    		{
    			try
    			{
    				NewMawMainGui.this.serverp.pingPendingNetworks();
    				onlinestate=I18n.translateToLocal("mawnewmenu.pinging");
    				NewMawMainGui.this.serverp.ping(server);
    			}
    			catch (Exception exception)
    			{
    				onlinestate = I18n.translateToLocal("mawnewmenu.mawserveroffline");
    				playercount = I18n.translateToLocal("mawnewmenu.playercount")+0;
    				NewMawMainGui.this.server.pingToServer = -1L;
    			}
    		}
    	});
    }

The onlinestate and playercount variables are the text that MainMenuGUI displays to let me know if the server is on

^{_{As the title says, I want to know how to get the code to get whether the server is on or not, and displays it on GuiScreen]}}

Thank you.