Client

using UnityEngine;
using System.Collections;
using UnityEngine.Networking;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Collections.Generic;

public class ClientScript : MonoBehaviour
{

    // Use this for initialization
    int channelID;
    int socketID;
    int socketPort = 8899;
    int connectionID;
    List<byte> _updateMessage = new List<byte>();
    int _updateMessageLength = 21;
    private static int player = 0;
    int recConnectionId;
    // Use this for initialization
    void Start()
    {
        NetworkTransport.Init();
        ConnectionConfig config = new ConnectionConfig();
        channelID = config.AddChannel(QosType.Reliable);
        int maxConnections = 5;
        HostTopology topology = new HostTopology(config, maxConnections);
        socketID = NetworkTransport.AddHost(topology, socketPort);
        Debug.Log("Socket Open. Socket ID = " + socketID);
        player = 0;
    }

    public void Connect()
    {
        byte error;
        connectionID = NetworkTransport.Connect(socketID, "149.153.102.43", socketPort, 0, out error);
        Debug.Log("Sending my connect message ");
        if (player == 0)
        {
            player = 2;
        }
    }

    // Update is called once per frame
    void Update()
    {
        int recHostId;
        int recChannelId;
        byte[] recBuffer = new byte[1024];
        int bufferSize = 1024;
        int dataSize;
        byte error;
        NetworkEventType recNetworkEvent = NetworkTransport.Receive(out recHostId, out recConnectionId, out recChannelId,
            recBuffer, bufferSize, out dataSize, out error);

        GameObject m_object;
        if (player == 1)
        {
            m_object = GameObject.Find("Blue");
            Vector3 pos = m_object.transform.position;
            SendMyUpdate(pos.x, pos.y, new Vector2(0, 0), 0);
        }
        else if (player == 2)
        {
            m_object = GameObject.Find("Red");
            Vector3 pos = m_object.transform.position;
            SendMyUpdate(pos.x, pos.y, new Vector2(0, 0), 0);
        }


        switch (recNetworkEvent)
        {
            case NetworkEventType.Nothing:
                break;
            case NetworkEventType.ConnectEvent:
                Debug.Log("incoming connection event received");
                if (player == 0)
                {
                    player = 1;
                }
                break;
            case NetworkEventType.DataEvent:
                recievedMessage(recBuffer);
                break;
            case NetworkEventType.DisconnectEvent:
                Debug.Log("remote client event disconnected");
                break;
        }
    }

    public void recievedMessage(byte[] data)
    {
        //Let's figure out what type of message this is.
        Debug.Log("Receiving Message ");
        char messageType = (char)data[0];
        if (messageType == 'U')
        {
            float posX = System.BitConverter.ToSingle(data, 1);
            float posY = System.BitConverter.ToSingle(data, 5);
            float velX = System.BitConverter.ToSingle(data, 9);
            float velY = System.BitConverter.ToSingle(data, 13);
            float rotZ = System.BitConverter.ToSingle(data, 17);
            Debug.Log("Player 2" + " is at (" + posX + ", " + posY + ") traveling (" + velX + ", " + velY + ") rotation " + rotZ);

            GameObject m_object;
            if (player == 1)
            {
                m_object = GameObject.Find("Red");
                m_object.transform.position = new Vector3(posX, posY, 0);

            }
            else if (player == 2)
            {
                m_object = GameObject.Find("Blue");
                m_object.transform.position = new Vector3(posX, posY, 0);
            }
        }
    }

    public void SendMyUpdate(float posX, float posY, Vector2 velocity, float rotZ)
    {
        byte error;
        _updateMessage.Clear();
        _updateMessage.Add((byte)'U');
        _updateMessage.AddRange(System.BitConverter.GetBytes(posX));
        _updateMessage.AddRange(System.BitConverter.GetBytes(posY));
        _updateMessage.AddRange(System.BitConverter.GetBytes(velocity.x));
        _updateMessage.AddRange(System.BitConverter.GetBytes(velocity.y));
        _updateMessage.AddRange(System.BitConverter.GetBytes(rotZ));
        byte[] messageToSend = _updateMessage.ToArray();
        Debug.Log("Sending my update message  " + messageToSend + " to all players in the room , Length " +
            messageToSend.Length);
        //PlayGamesPlatform.Instance.RealTime.SendMessageToAll(false, messageToSend);
        NetworkTransport.Send(socketID, connectionID, channelID, messageToSend, messageToSend.Length, out error);
    }

    public static int getPlayer()
    {
        return player;
    }
}