
One ETA out of three kinds of telematics
Own trucks report through OEM portals on the ACEA rFMS API, subcontractors run aftermarket boxes, and the spot carrier has a phone. We normalise all three into one position and status model — OAuth2 bearer tokens, version pinned in the Accept header, 429 backoff, pagination by receivedDateTime — and state the ceiling first: rFMS 5.0.0 guarantees position only every fifteen minutes and status every sixty, which is roughly twenty kilometres of uncertainty at motorway speed. Most OEMs push more often than that, but the guarantee is what a customer contract can rest on, so the last leg into a 30- or 60-minute dock window has to come from driver-app pings rather than the OEM feed. We measure the observed interval per OEM in week one and tell you which windows your data can and cannot support.
- rFMS 5.0.0, aftermarket telematics and driver-app pings joined into one event model
- Per-lane calibration and a published prediction interval rather than a point ETA
- Honest degradation: fewer pings widens the interval instead of inventing precision




