Sessions
The following session messages are supported in both directions:
| Message | Type | Comment |
|---|---|---|
| Logon | A | Begin session (or resume a broken session) |
| Heartbeat | 0 | |
| Test Request | 1 | |
| Resend Request | 2 | |
| Reject | 3 | Malformed message or improper session level handling |
| Sequence Reset | 4 | Both Gap Fill (GapFillFlag=Y) and Reset |
| Logout | 5 | Used to gracefully close session |