public BaseInputPacket WaitPacket(TcpClient client, long timeoutMillis)
        {
            Stopwatch timer = Stopwatch.StartNew();
            NetworkStream stream = client.GetStream();
            BaseInputPacket packet = null;
            while (!stream.DataAvailable)
            {
        if (timer.ElapsedMilliseconds > timeoutMillis)
        {
            timer.Stop();
                    return null;
        }
        }
                //reading header
                byte[] packetHeader = new byte[24];
                stream.Read(packetHeader, 0, packetHeader.Length);
                uint packetType = BitConverter.ToUInt32(packetHeader, 8);
                uint dataLength = BitConverter.ToUInt32(packetHeader, 12);
                //if header is OK, create and parse new packet
                if (mInputPackets[(PacketType) packetType] != null)
                {
                    packet = (BaseInputPacket)Activator.CreateInstance(mInputPackets[(PacketType) packetType]);
                    packet.Parse(stream, dataLength);
                }
                else
                {
                    throw new Exception("Unknown packet received!");
                }
            }

            timer.Stop();

            return packet;
        }