Devices
Devices views
The "Devices" page provides a detailed overview of the system's current status, allowing real-time monitoring of gateways and connected devices. This section presents crucial information, such as connectivity status and Signal Quality Indicator (SQI), along with other important performance metrics.
List View
The default display format is "List," which shows all devices in the project along with their diagnostic and status parameters.
Image view
You can also select the "Image" view, which provides a spatial representation of the sensors on a photograph or an image of the structure.
Sensor Identification
Devices are uniquely identified by the device ID (devEUI) and device type, parameters that cannot be modified by the user as they are provided by the system. Typically, a Custom Name is associated with the device ID, which can be personalized by the user on the Device Settings page.
Signal Quality Indicator (SQI)
The SQI provides a snapshot of the signal quality for each sensor, based solely on the last transmitted packet. LoRa uplinks provide key information for calculating the Signal Quality Indicator (SQI), which is based on the Signal-to-Noise Ratio (SNR) and the Received Signal Strength Indicator (RSSI).
The SQI is represented on the following scale:
No uplink available
1/4 Very weak signal
2/4 Weak signal
3/4 Good signal
4/4 - Strong signal
Device Status: Online/Offline
It is important to note that this information may vary between the different packets that make up each individual event and/or transmitted data. The thresholds determining the signal quality of the last packet were established through experimental statistical analysis. This analysis involved multiple transmissions from various sensors in different scenarios and transmission channels. By dividing the statistical distribution of snr-rssi value pairs into percentiles, the most appropriate thresholds were identified.
The operational status of devices is indicated as follows:
• Online (green tag) if the device is functioning properly and transmitting data to the system.
• Offline (red tag) if the device is not transmitting data to the system.
The device status is calculated through the following process:
Initial Check: The system checks if there is recent information from the last device uplink. If no information is available, the device is marked as offline.
Time Calculation: The time elapsed since the last device uplink is calculated.
Time Verification: If more than 35 minutes (extended to 65 minutes for Communication Nodes) have passed without receiving an uplink, the device is presumed to be offline. An additional 15 minutes is added to account for potential delays or temporary issues.
Final Decision: If the total time since the last uplink is less than 50 minutes (35 + 15 extra minutes) for regular devices, or 80 minutes (65 + 15 extra minutes) for Communication Nodes, the device is considered online. Otherwise, it is marked as offline.
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