Connect device readings to operational assets
An authorised MQTT subscription can supply device and gateway observations to Uplyst's intelligence layer. Asset identity, measurement units and observation time connect telemetry with equipment, maintenance records and production activity.
MQTT topics route messages; the payload defines what each observation means. Mapping a device to a stable business asset preserves its operational history when sensors are replaced or moved.
Distinguish current readings from last known values
A retained message can give a new subscriber the latest retained publication for a topic. Its arrival does not establish when the equipment was measured or whether the device is still connected. Observation time and an appropriate freshness threshold determine how that value is used.
MQTT 5 message and session expiry settings affect what remains available to reconnecting consumers. Stale readings and missing intervals remain visible in the operational view.
Bearing temperature
72.4°C
Last known reading
- Observed
- 14:02:08 UTC
- Received
- 14:14:08 UTC
- Delivery
- Retained publication
Observation age at receipt
12 minutesFresh observation requiredThe broker delivered a value now. The asset was measured twelve minutes earlier.
- Maintenance reference
- WO-2841 · Bearing inspection
- Operational use
- Retain in history; exclude from current condition.
utilities/pump-p204/bearing/temperatureDelivery quality and observation history
MQTT provides three quality-of-service levels: at most once, at least once and exactly once within the protocol delivery exchange. Broker and client session settings affect what can be recovered after a disconnection.
Application observation identifiers or sequences help recognise missing and repeated readings. MQTT delivery guarantees do not by themselves guarantee that a downstream maintenance task or database update happens exactly once.
| Telemetry concern | Required context |
|---|---|
| Measurement value | Unit, scale and valid range |
| Observation time | Source clock and timestamp meaning |
| Device replacement | Mapping to stable asset identity |
| Repeated delivery | Application observation identity or revision |
Scoped broker and topic access
The broker controls authentication and authorisation for publishers and subscribers. Supported TLS settings, dedicated client identities and topic permissions limit access to the relevant equipment or site. Credential and certificate renewal form part of maintaining that connection.
Put equipment conditions in business context
Changes in condition can be considered alongside maintenance history, production schedules and quality records. Units, valid ranges and clock quality help distinguish a real operating change from a faulty or delayed observation. Equipment control requires its own authorised industrial workflow.