| Alert rule | A condition on one reading, such as "temperature greater than 30", that sends a notification to the user's phone. See Alerts. |
| App | The ThingsLinker app for Android, for users. |
| Auth Token | A device's secret identity on ThingsLinker. It goes into the firmware and must be kept private. |
| Barcode | A device's 13-digit code, printed on its label. Users enter or scan it to add the device. |
| Blueprint | A template for one kind of product, with a hardware type and a connection type. Devices are created under a blueprint. |
| Blueprint Key | A blueprint's code, starting with BLUE. The firmware needs it with the auth token. |
| Cooldown | How long an alert rule waits before it can notify again. |
| Data type | The kind of value a widget carries: Integer, Float, Boolean, String or structured. |
| Device | One physical unit, created by an organization under a blueprint and added to an account by a user. |
| MQTT | The messaging protocol devices and dashboards use to exchange readings and commands through ThingsLinker's broker. |
| Offline storage | A library option that keeps readings while the device has no connection and sends them later. |
| Organization | A company that supplies devices and manages them in the Organization Portal. |
| Organization Portal | The website for organizations: org.thingslinker.com. |
| OTA (over the air) | Updating a device's firmware without a cable. Organizations ship updates as shipments. |
| Setup mode | The state in which a WiFi device advertises over Bluetooth and waits for WiFi details. |
| Shipment | A firmware update sent to selected devices of a blueprint. |
| Telemetry | The readings devices send and ThingsLinker records. |
| User | A person with an account on the User Portal and the app, who adds devices and uses their dashboards. |
| User Portal | The website for users: app.thingslinker.com. |
| Virtual pin | A channel, V0 to V124, that links a widget to the firmware. Unrelated to the ESP32's GPIO pins. |
| Widget | One tile on a device's dashboard that shows or controls something. |