How to read DLMS without using GXNet nor GXSerial

By khun_panya , 5 April, 2019

Forums

This page https://github.com/Gurux/Gurux.DLMS.Net
says that Gurux.Net nor Gurux.Serial is not necessary.
But the examples have extensively used GXSerial and GXNet.
How can we implement ReadDLMSPacket method by using just simple TcpClient ?
Please show some example. Thanks.

How to read DLMS without using GXNet nor GXSerial

OK. Here is my progress. I write a sub

private static byte[] SendAndReceive(TcpClient net, byte[] command)
{
var ns = net.GetStream();
ns.Write(command, 0, command.Length);
System.Threading.Thread.Sleep(100);
var buff = new byte[1024];
using (var ms = new System.IO.MemoryStream())
{
int len;
while (ns.DataAvailable)
{
len = ns.Read(buff, 0, buff.Length);
ms.Write(buff, 0, len);
}
return ms.ToArray();
}
}

And here is my main program

var net = new TcpClient();
net.Connect("xxx.xxx.xxx.xxx", 6001); // Landis+Gyr meter

var client = new GXDLMSClient();
client.UseLogicalNameReferencing = false;
client.InterfaceType = InterfaceType.HDLC;
client.ServerAddress = 1;
client.ClientAddress = 16;

var send = client.SNRMRequest();
var recv = SendAndReceive(net, send);
client.ParseUAResponse(new GXByteBuffer(recv));

But now the problem is ParseUAResponse throws GXDLMSException("Invalid Exception.").
Why is that? Lines below are send and recv binary.

7E A0 07 03 21 93 0F 01 7E
7E A0 1E 21 03 73 C3 7A 81 80 12 05 01 80 06 01 3E 07 04 00 00 00 01 08 04 00 00 00 01 07 22 7E