Acknowledging concox GT06N gps device after receiving login

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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 the code i am using:-

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"); }

 

Please help me.I am stuck.

Thanks in advance