/// <summary>
/// Raises the APDU Received event
/// </summary>
/// <param name="apdu">The apdu that was received</param>
// Revision History
// MM/DD/YY who Version Issue# Description
// -------- --- ------- ------ ---------------------------------------
// 05/21/13 RCG 2.80.32 N/A Created
private void OnAPDUReceived(xDLMSAPDU apdu)
{
if (APDUReceived != null && apdu != null)
{
APDUReceived(this, new APDUEventArguments(apdu));
}
}
/// <summary>
/// Sends an APDU to the connected device
/// </summary>
/// <param name="apdu">The APDU to send</param>
// Revision History
// MM/DD/YY who Version Issue# Description
// -------- --- ------- ------ ---------------------------------------
// 05/21/13 RCG 2.80.32 N/A Created
public void SendAPDU(xDLMSAPDU apdu)
{
if (IsOpen && apdu != null)
{
WPDU Wrapper = new WPDU(ClientPort, ServerPort, apdu.Data);
m_Logger.WriteLine(Logger.LoggingLevel.Detailed, "Sending APDU. Type: " + EnumDescriptionRetriever.RetrieveDescription(apdu.Tag));
Send(Wrapper.Data);
}
}
/// <summary>
/// Parses the data for any APDU's
/// </summary>
// Revision History
// MM/DD/YY who Version Issue# Description
// -------- --- ------- ------ ---------------------------------------
// 02/04/12 RCG 2.70.63 N/A Created
private void ParseAPDUData()
{
try
{
lock (m_HighLevelDataBuffer)
{
while (m_HighLevelDataBuffer.Count > 0)
{
// The first byte should be the APDU tag
xDLMSAPDU NewAPDU = xDLMSAPDU.Create((xDLMSTags)m_HighLevelDataBuffer[0]);
CipheredAPDU NewCipheredAPDU = NewAPDU as CipheredAPDU;
if (NewAPDU != null)
{
// Set up the security settings for a Ciphered APDU
if (NewCipheredAPDU != null)
{
if (CipheredAPDU.IsTagGlobalCipher(NewCipheredAPDU.Tag))
{
NewCipheredAPDU.BlockCipherKey = GlobalEncryptionKey;
}
else if (CipheredAPDU.IsTagDedicatedCipher(NewCipheredAPDU.Tag))
{
NewCipheredAPDU.BlockCipherKey = DedicatedEncryptionKey;
}
if (PendingDecryptAuthenticationKey != null)
{
NewCipheredAPDU.AuthenticationKey = PendingDecryptAuthenticationKey;
}
else
{
NewCipheredAPDU.AuthenticationKey = DecryptAuthenticationKey;
}
NewCipheredAPDU.ApTitle = ServerApTitle;
m_LastFrameCounterReceived = NewCipheredAPDU.FrameCounter;
}
// We found a valid APDU tag so we can try to parse it. We already checked the first byte so just use the rest
MemoryStream DataStream = new MemoryStream(m_HighLevelDataBuffer.ToArray());
NewAPDU.Parse(DataStream);
// Remove the data that has been parsed
m_HighLevelDataBuffer.RemoveRange(0, (int)DataStream.Position);
m_Logger.WriteLine(Logger.LoggingLevel.Detailed, "APDU Received. Type: " + EnumDescriptionRetriever.RetrieveDescription(NewAPDU.Tag));
if (NewCipheredAPDU != null)
{
xDLMSAPDU UncipheredAPDU = null;
if (PendingDecryptAuthenticationKey != null)
{
// We are in the middle of a key exchange so we could get a message using either the pending key or
// the previous key. We need to attempt the Pending key first
try
{
UncipheredAPDU = NewCipheredAPDU.UncipheredAPDU;
}
catch (Exception)
{
m_Logger.WriteLine(Logger.LoggingLevel.Detailed, "Unciphering failed using the Pending Authentication Key. Using previous key.");
}
if (UncipheredAPDU == null)
{
// Try it with the previous key
NewCipheredAPDU.AuthenticationKey = DecryptAuthenticationKey;
UncipheredAPDU = NewCipheredAPDU.UncipheredAPDU;
}
}
else
{
UncipheredAPDU = NewCipheredAPDU.UncipheredAPDU;
}
// Send up the Unciphered APDU
OnAPDUReceived(UncipheredAPDU);
}
else
{
OnAPDUReceived(NewAPDU);
}
}
else
{
// The tag is not valid so lets get rid of the byte and move on
m_HighLevelDataBuffer.RemoveAt(0);
}
}
}
}
catch (Exception e)
{
// This most likely means that we don't have all of the data yet for a specific message
// so do nothing and hope the rest of the data comes in soon.
m_Logger.WriteLine(Logger.LoggingLevel.Detailed, "Exception while parsing an APDU. Waiting for more data. Message: " + e.Message);
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="apdu">The APDU for the event</param>
// Revision History
// MM/DD/YY who Version Issue# Description
// -------- --- ------- ------ ---------------------------------------
// 05/21/13 RCG 2.80.32 N/A Created
public APDUEventArguments(xDLMSAPDU apdu)
: base()
{
m_APDU = apdu;
}
