| Acknowledge |
Marks that someone has seen an alarm. |
| Alarm |
An event from a rule or device that needs handling by people. It has a severity, cause, and an active or cleared status. |
| Auto-clear |
Closing an alarm automatically after the condition has returned to normal for N minutes or N messages. |
| bn (base name) |
A name prefix in SenML that marks the source, for example 001a2b3c4d5e:. |
| Bootstrap |
Automatic device provisioning through a challenge-response protocol. |
| Bridge |
A Mosquitto feature that forwards messages from the gateway’s local broker to the Celestian broker. |
| Channel |
A message stream, part of the MQTT topic. |
| Comparison |
A logic node that evaluates a simple condition on the payload. |
| Connection |
A device’s permission to publish or subscribe to a channel. |
| Custom Node |
Logic that is saved and reused in many rules. |
| Deny by default |
Without a written permission, access is refused. |
| Device |
Equipment with an ID and key to connect to the broker. |
| Device key |
The device’s MQTT password; shown once. |
| Device type |
An attribute schema for a group of devices. |
| Direct policy |
A permission given directly to one member for one object. |
| Executions |
The 7-day execution trace of a rule. |
| Gateway |
A device that represents many sensors behind it. |
| Group |
A hierarchical grouping; a vehicle for permission inheritance. |
| Internal DB |
A rule output that stores messages in Celestian’s time-series database. |
| Journal |
The audit trail of changes. |
| Metric Catalog |
The list of units and labels of metrics per workspace. |
| Last Seen |
The time a message was last received from a device. |
| Live |
A realtime message stream in Messages; not stored. |
| Logic |
A rule node that decides whether and what to forward. |
| Metadata |
Typed extra data on an object (text, number, location, perimeter). |
| Output |
A rule node that stores or forwards the result. |
| PAT |
A Personal Access Token for the REST API. |
| Permission block |
A scope, object, actions, and effect (allow or deny). |
| Publisher |
The authenticated device that sent a message, recorded by the broker. |
| Retained |
An MQTT message that the broker keeps and sends to new subscribers; used for device configuration. |
| Roster |
The list of sources (child sensors) seen in gateway messages. |
| Route |
A unique slug of a workspace or channel used in topics. |
| Rule |
An Input, Logic, Output flow for processing messages. |
| Scope |
The kind of object that permissions apply to. |
| SenFlat |
A compact flat payload format (v1 and v2). |
| SenML |
The standard payload format, RFC 8428. |
| Serial |
An optional device identifier (a MAC or serial number), unique per workspace. |
| Severity |
An alarm level from 0 to 100 (Low, Medium, High, Critical). |
| Subtopic |
The part of a topic after the channel; a free-form label. |
| Workspace |
The data and access boundary; a team’s working space. |
