C# 接收登录数据包后确认concox GT06N GPS设备

我正在从我的concox GT06N GPS设备接收登录数据包。我也读过。但当我试图向设备发送响应包（确认）时，似乎响应包没有被传递。因为在发送确认后，我并没有从设备接收位置数据包

下面是我正在使用的代码：

TcpClient cli = new TcpClient();

IPEndPoint deviceIPE = new IPEndPoint(IPAddress.Parse(System.Configuration.ConfigurationManager.AppSettings["CID"].ToString())
  , Convert.ToInt32(System.Configuration.ConfigurationManager.AppSettings["CPORT"]));
cli.Connect(deviceIPE);
logsys.Enqueue("TCP Client created");
using (NetworkStream clientstream = cli.GetStream())
{
    byte[] data = (byte[])sdata1.Dequeue();
    string cip = suser1.Dequeue().ToString();
    string[] acip = new string[2];
    if (cip != "")
    {
        acip = cip.Split(':');
    }
    TechnoComPacket packet = new TechnoComPacket(data);

    string rdata = packet.StringToByteArray(data);

    logsys.Enqueue("Response Packet to be Send Is :" + rdata);

    byte[] toSend = Encoding.ASCII.GetBytes(rdata);


    ASCIIEncoding encoder = new ASCIIEncoding();
    byte[] buffer = encoder.GetBytes(rdata);
    clientstream.Write(buffer, 0, buffer.Length);
    logsys.Enqueue("Response Packet Sent successfully");
}