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Home Architecture, security and coding Implementing MLLP in C#
Implementing MLLP in C#
Written by Division by Zero   
Saturday, 13 February 2010 10:15

The MLLP (Minimal Lower Layer Protocol) protocol, which most HL7 communications use, is quite easy to implement in C#. Here's an example of how it can be done. The following code snippet is another way to "pack" and "unpack" MLLP messages. This needs to be done just after receiving and before sending a message over a TCP socket.

/// 
 /// This helper class supports the Minimum Low Layer Protocol
 /// 
 public abstract class MLLPHelper
 {
 #region Private constants
 private const int MLLP_START_CHARACTER = 11; // HEX 0B
 private const int MLLP_FIRST_END_CHARACTER = 28; // HEX 1C
 private const int MLLP_LAST_END_CHARACTER = 13; // HEX 0D
 #endregion

 #region Public static methods
 /// 
 /// Validate MLLP message
 /// 
 ///
 
Stringbuilder containing the message
 public static void StripMLLPContainer(StringBuilder sb)
 {
 // Strip the message of the MLLP container characters
 sb.Remove(0, 1);
 sb.Remove(sb.Length - 2, 2);
 }

 /// 
 /// Validate the MLLP message containing the HL7 message
 /// 
 ///
Message
 /// true if valid
 public static bool ValidateMLLPMessage(StringBuilder sb)
 {
 bool result = false;

 if (sb.Length > 3)
 {
 if (((int)sb[0] == MLLP_START_CHARACTER))
 {
 if (((int)sb[sb.Length - 2] == MLLP_FIRST_END_CHARACTER) && ((int)sb[sb.Length - 1] == MLLP_LAST_END_CHARACTER))
 result = true;
 }
 }

 return result;
 }

 /// 
 /// Create a MLLP message
 /// 
 ///
Original message
 /// MLLP message
 public static string CreateMLLPMessage(string p)
 {
 StringBuilder sb = new StringBuilder(p);
 sb.Insert(0, (char)MLLP_START_CHARACTER);
 sb.Append((char)MLLP_FIRST_END_CHARACTER);
 sb.Append((char)MLLP_LAST_END_CHARACTER);

 return sb.ToString();
 }

 /// 
 /// Test if the character equals the start message character
 /// 
 ///
Character to test
 /// True if matches
 public static bool IsStartCharacter(char start)
 {
 return (start == MLLP_START_CHARACTER);
 }
 #endregion
 }
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Comments  

 
0 # Mayura 2012-05-07 16:12
I have used SSL stream to secure the MLLP transaction. Can you point me to any documentation to show how to set up the client and server certificates for the same?
Reply | Reply with quote | Quote
 
 
0 # Bas 2012-05-08 08:08
Hi Mayura,

I'm not sure I understand your question correctly. Do you want to use SSL as a client or a server? Do you use .Net?

If so, maybe these two posts will help you. They show how to use a server certiciate and a client certificate. In the comments (see the code examples) is shortly explained how to install/import a certificate in order to let the software work.

Here's the post on certificates on a server:
dib0.nl/.../...

here's the post on client-side certificates:
dib0.nl/.../...
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