Omnitracs Event Subscription Service (ESS)
A publish-subscribe integration service in which Omnitracs applications continually publish transactions (vehicle positions/GPS, driver messages, Hours-of-Service logs, and critical-event / driver-coaching notifications) to the Integration Web Server, and back-office applications subscribe to and periodically request the transaction types they want. The Event Subscription Service delivers each transaction as a SOAP/XML package and expects a SOAP/XML acknowledgement. Transport is request/response polling over HTTPS, not a WebSocket. Partner/customer gated; endpoints are modeled.