# Omnitracs Event Subscription Service (ESS)

**Canonical:** https://apis.io/apis/omnitracs/omnitracs-event-subscription-api/  
**Provider:** Omnitracs — https://apis.io/providers/omnitracs/  
**Documentation:** https://services.omnitracs.com/portalWeb/

Omnitracs Event Subscription Service (ESS) is one of 3 APIs that [Omnitracs](https://apis.io/providers/omnitracs/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Positions, Message, HOS, Critical Events, and Publish Subscribe. The published artifact set on APIs.io includes API documentation.

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.

## Machine-readable artifacts (1)

- **Documentation** — https://www.cnrportal.com/help/otsWeb/help/en_US/documents/doc_cust_integrate-with-sp_d.pdf

## Other Omnitracs APIs (2)

- [Omnitracs Web Services (Roadnet Platform)](https://apis.io/apis/omnitracs/omnitracs-web-services-api/)
- [Omnitracs Entity Management Web Services](https://apis.io/apis/omnitracs/omnitracs-entity-management-api/)

## Tags

Positions, Message, HOS, Critical Events, Publish Subscribe

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/omnitracs/omnitracs-event-subscription-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/omnitracs/.