Reply To: Eclipsys SCM Acknowledgements

[Richard Hart]

We are using iSoft’s version of SCM.

I beleive that that messaging component is similar with Cloverleaf connecting to MSMQ and sending and receiving data on different ports.

The MSMQ will send a TCP ACK (single character), encapsulated in MLLP when it receives the message from Cloverleaf and expects this in reply when an ACK is sent to Cloverleaf.

I modified the ‘tcp_acknak.pdl’ code for the variant and this has been in production for a few years.

The header is

define phrase basic-msg;

   ;

   field data = variable-array( not( ) );

   ; ;

end phrase;

define phrase ack-msg;

   ;

   ;

   ;

   ;

end phrase;

define phrase ack-msg;

   ;

   ;

   ;

   ;

end phrase;

A word of caution – we proved that if MSMQ crashes when a large number of message are queued – all are lost!