private void Device_OnPacketArrival(object sender, CaptureEventArgs e)
{
var time = e.Packet.Timeval.Date;
var len = e.Packet.Data.Length;
OpcPacket packet = new OpcPacket().Parse(e.Packet);
if (packet != null)
{
Log.Information("OPC Packet Transfer. ID: {0} Type: {1} Direction: {2}", packet.SecuritySequenceNumber, packet.OpcMessage.ToString(), packet.Direction);
if (ResponseToRequest(packet))
{
var diff = packet.Time - lastPacket.Time;
if (diff > 100000)
{
return;
}
OpcConversation conv = new OpcConversation(lastPacket, packet);
Prom.UpdateMetrics(conv);
}
lastPacket = packet;
}
}
private bool ResponseToRequest(OpcPacket newPacket)
{
if (lastPacket != null)
{
// Was the previous packet a request and the new packet a response?
if (lastPacket.Direction == Direction.Incoming && newPacket.Direction == Direction.Outgoing)
{
// Are we sure they have the same ID?
if (lastPacket.SecuritySequenceNumber == newPacket.SecuritySequenceNumber)
{
return(true);
}
}
}
return(false);
}
