I amend my statement as far as "all 8 messages at once" since most messages only go one way. Like so:
- Response message - RECEIVE to SEND task on both sides (ILS and EMS will handle this message - contains code notifying that message was accepted or rejected by socket)
- Ping message - SEND to RECEIVE task (this acts as the "keep alive" mechanism) Pings are sent from both sides at 40-second intervals.
- Add message - ILS to EMS only
- Delete message - ILS to EMS only
- Return message - ILS to EMS only
- Request message - ILS to EMS only
- Status Check message - ILS to EMS only
- Status message - EMS to ILS only
As a visual representation, a typical transaction would follow this order:
ILS EMS
--- ---
Request -->
<-- Response (request accepted/rejected)
<-- Status (requested item in available/unavailable)
Response -->
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