///<summary>
/// Get packet from received data.
///</summary>
///<param name="buff">
/// Received data. </param>
///<returns>
///Reply if any.
///</returns>
private byte[] GetPacket(byte[] buff)
{
GXByteBuffer receivedFrame = new GXByteBuffer(buff);
// Save position where data was. This is used if data is not sent to
// this server.
ushort offset = Reply.Data.Size;
GXDLMS.GetData(Settings, receivedFrame, Reply);
// If all data is not received yet.
if (!Reply.IsComplete)
{
return(null);
}
byte[] data;
// If client sends keepalive or get next frame request.
if ((Reply.MoreData & RequestTypes.Frame) != 0)
{
if (Frames != null && Frames.Length > FrameIndex)
{
data = Frames[FrameIndex++];
return(data);
}
FrameIndex = 0;
data = GXDLMS.SplitToHdlcFrames(Settings, Settings.KeepAlive(), null)[0];
return(data);
}
// Check is data sent to this server.
if (ConnectedServerAddress == 0 || ConnectedClientAddress == 0)
{
// Check is data send to this server.
if (!IsTarget(Settings.ServerAddress, Settings.ClientAddress))
{
Reply.Data.Size = offset;
Reply.IsComplete = false;
}
ConnectedServerAddress = Settings.ServerAddress;
ConnectedClientAddress = Settings.ClientAddress;
}
else if (Settings.ServerAddress != ConnectedServerAddress ||
Settings.ClientAddress != ConnectedClientAddress)
{
Reply.Data.Size = offset;
Reply.IsComplete = false;
}
// Clear received data.
receivedFrame.Clear();
ServerReply.Data = Reply.Data;
FrameIndex = 0;
return(null);
}
///<summary>
/// Removes the HDLC frame from the packet, and returns COSEM data only.
///</summary>
///<param name="reply">
/// The received data from the device.
///</param>
///<param name="data">
/// Information from the received data.
///</param>
///<returns>
/// Is frame complete.
///</returns>
public bool GetData(GXByteBuffer reply, GXReplyData data)
{
return(GXDLMS.GetData(Settings, reply, data));
}
///<summary>
/// Removes the HDLC frame from the packet, and returns COSEM data only.
///</summary>
///<param name="reply">
/// The received data from the device.
///</param>
///<param name="data">
/// Information from the received data.
///</param>
///<returns>
/// Is frame complete.
///</returns>
public bool GetData(GXByteBuffer reply, GXReplyData data, GXReplyData notify)
{
return(GXDLMS.GetData(Settings, reply, data, notify, null));
}
///<summary>
/// Removes the HDLC frame from the packet, and returns COSEM data only.
///</summary>
///<param name="reply">
/// The received data from the device.
///</param>
///<param name="data">
/// Information from the received data.
///</param>
///<returns>
/// Is frame complete.
///</returns>
public bool GetData(byte[] reply, GXReplyData data)
{
return(GXDLMS.GetData(Settings, new GXByteBuffer(reply), data));
}
///<summary>
/// Handles client request.
/// </summary>
///<param name="buff">
/// Received data from the client. </param>
///<returns>
///Response to the request. Response is null if request packet is not complete.
///</returns>
public virtual byte[] HandleRequest(byte[] buff, GXDLMSConnectionEventArgs connectionInfo)
{
if (buff == null || buff.Length == 0)
{
return(null);
}
if (!Initialized)
{
throw new Exception("Server not Initialized.");
}
try
{
receivedData.Set(buff);
bool first = Settings.ServerAddress == 0 && Settings.ClientAddress == 0;
GXDLMS.GetData(Settings, receivedData, info);
//If all data is not received yet.
if (!info.IsComplete)
{
return(null);
}
receivedData.Clear();
if (first)
{
// Check is data send to this server.
if (!IsTarget(Settings.ServerAddress,
Settings.ClientAddress))
{
info.Clear();
return(null);
}
}
//If client want next frame.
if ((info.MoreData & RequestTypes.Frame) == RequestTypes.Frame)
{
return(GXDLMS.GetHdlcFrame(Settings, Settings.ReceiverReady(), replyData));
}
//Update command if transaction and next frame is asked.
if (info.Command == Command.None)
{
if (transaction != null)
{
info.Command = transaction.command;
}
}
//Check inactivity time out.
if (hdlcSetup != null)
{
if (info.Command == Command.Snrm)
{
dataReceived = DateTime.Now;
}
else
{
int elapsed = (int)(DateTime.Now - dataReceived).TotalSeconds;
//If inactivity time out is elapsed.
if (elapsed >= hdlcSetup.InactivityTimeout)
{
Reset();
dataReceived = DateTime.MinValue;
return(null);
}
dataReceived = DateTime.Now;
}
}
byte[] reply = HandleCommand(info.Command, info.Data, connectionInfo);
info.Clear();
return(reply);
}
catch (Exception ex)
{
Debug.WriteLine(ex.ToString());
if (info.Command != Command.None)
{
return(ReportError(info.Command, ErrorCode.HardwareFault));
}
else
{
Reset();
if (Settings.Connected)
{
Settings.Connected = false;
Disconnected(connectionInfo);
}
return(null);
}
}
}
