Specialized FEPI functions

These topics describe specialized control functions that are handled by FEPI but can be taken over by a FEPI application.

Set and test sequence number (STSN)
In SLU P mode, message sequence numbers are available in the data stream to allow message resynchronization. This can be demanded by a ‘Set and Test Sequence Number’ (STSN) request when a session is started.
DRx responses
In all cases except those mentioned in the next paragraph, FEPI automatically gives a positive DRx response when the inbound data indicates that a response is required. This response flows on the next FEPI command (SEND, RECEIVE, CONVERSE, FREE, or START).
SNA commands
The FEPI ISSUE command allows you to send various other SNA commands yourself. You should do this only if you have a particular requirement.

Parent topic: Developing with the FEPI API