Acknowledging concox GT06N gps device after receiving login packet

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C#

multi-threading

GPS

I am receiving login packet from my concox GT06N gps device.Also i have read it.But when i am trying to send response packet(acknowledgement) to device it seems like the response packet is not getting delivered. Because after sending acknowledgement i am not receiving location packet from device. Below is my code:-


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");
}