CustomNetManager

using UnityEngine;
using System.Collections;
using UnityEngine.Networking;
using UnityEngine.Networking.Match;
using UnityEngine.Networking.Types;
using UnityEngine.UI;

public class MyNetworkManager : NetworkManager {
    [SerializeField] GameObject gameBrowserWindow;
    [SerializeField] GameObject noGamesText;
    [SerializeField] BrowserButton browserButtonPrefab;
    [SerializeField] GameObject offlineUI;
    [SerializeField] GameObject onlineUI;
    [HideInInspector] public bool isHost;
    [HideInInspector] public long m_networkID;
    [HideInInspector] public long m_nodeID;

    void Start()
    {
        StartMatchMaker();
    }

    // NOTE: This is a workaround to avoid a disconnection bug (Issue Tracker case No. 794106)
    public override void OnClientDisconnect (NetworkConnection conn)
    {
        Debug.Log("Client would disconnect now if the following line is uncommented.");
        //base.OnClientDisconnect (conn);
    }

    public void StartGameServer()
    {
        maxConnections = 2;
        if(matchMaker == null) StartMatchMaker();
        matchMaker.CreateMatch("My Game", (uint)8, true, "", info => {
            base.OnMatchCreate (info);
            isHost = true;
            offlineUI.SetActive(false);
            onlineUI.SetActive(true);
            m_networkID = (long)info.networkId;
            Debug.Log("Match Created " + m_networkID.ToString());
        });
    }

    public void JoinGame(MatchDesc match)
    {
        if(matchMaker == null) StartMatchMaker();
        matchName = match.name;
        matchSize = (uint)match.currentSize;
        matchMaker.JoinMatch(match.networkId, "", info => {
            base.OnMatchJoined(info);
            if(info.success)
            {
                m_nodeID = (long)info.nodeId;
                StartClient(new MatchInfo(info));
                offlineUI.SetActive(false);
                onlineUI.SetActive(true);
                Debug.Log("Match found, joining game...");
            }
            else
            {
                Debug.Log("Error Connecting!");
            }
        });
    }

    public void ListMatches()
    {
        if(matchMaker == null) StartMatchMaker();
        matchMaker.ListMatches(0, 20, "", OnMatchList);
    }

    public override void OnMatchList (UnityEngine.Networking.Match.ListMatchResponse matchList)
    {
        // Remove existing buttons
        DestroyButtons();

        if(matchList.matches == null || matchList.matches.Count == 0)
        {
            noGamesText.SetActive(true);
        }
        else
        {
            noGamesText.SetActive(false);
            foreach(var match in matchList.matches)
            {
                var button = Instantiate<BrowserButton>(browserButtonPrefab);
                button.OnClickedHandler = JoinGame;
                button.match = match;
                button.SetText(match.name);
                button.transform.SetParent(gameBrowserWindow.GetComponentInChildren<GridLayoutGroup>().transform, false);
            }
        }
    }

    public void Disconnect()
    {
        if(isHost)
        {
            matchMaker.DestroyMatch((NetworkID)m_networkID,response =>
                {
                    Debug.Log("Shutdown host");
                    NetworkManager.singleton.StopHost();
                    NetworkManager.singleton.StopMatchMaker();
                });
        }
        else
        {
            if(matchMaker != null)
            {
                matchMaker.DropConnection((NetworkID)m_networkID, (NodeID)m_nodeID, response =>
                    {
                        Debug.Log("Shutdown client");
                        NetworkManager.singleton.StopClient();
                        NetworkManager.singleton.StopMatchMaker();
                    });
            }

        }

        offlineUI.SetActive(true);
        onlineUI.SetActive(false);
    }

    void DestroyButtons()
    {
        foreach(Transform child in gameBrowserWindow.GetComponentInChildren<GridLayoutGroup>().transform)
        {
            DestroyImmediate(child.gameObject);
        }
    }
}