Sensor Monitoring Data Update Rules

Sensors may take measurements more frequently than they report them. A measurement is reported only when an update rule is triggered.

Common Reporting Rules

For all models covered below, monitoring data is reported when any of these conditions is met:

1. A monitored value or state reaches its change threshold.
2. For models with scheduled reporting, the scheduled interval is reached even if nothing has changed.
3. An alert rule is triggered or returns to normal. Alert and recovery reports are not blocked by the normal change threshold or reporting interval.

Probe disconnection and recovery are also reported immediately. For Sensors with a physical button, briefly pressing the button for 1 second forces an immediate data update. Battery data accompanies temperature reports and is sent at most once per hour.

Temperature and Humidity Sensors

For ST6 and ST9, temperature and humidity use an OR condition: either value can trigger the report, and the current temperature and humidity values are sent together. The comparison is made against the last values sent by a change-triggered report; a scheduled report does not replace that comparison baseline.

For H1B firmware earlier than v1.9.5, existing Sensor System documentation specifies a 0.9°F temperature-change threshold for ST3 and ST4 instead of 1.8°F.

SW2 Water Leak Sensor