Every device page has a Telemetry tab. It is the quickest way to check that a device sends what you expect: it lists every key the device has sent, with its latest value and when it came, and draws a trend of the numeric keys you pick.
Open it
- Open Devices and select the device.
- Select the Telemetry tab.
You need the Read telemetry readings permission (every member role has it by default) and access to the device.
The table of latest values
The table, captioned Latest values, has one row per key the device has sent:
| Column | Shows |
|---|---|
| Name | The key’s Label from the device profile, or the key itself when the profile does not name it |
| Value | The latest value. Numbers in your locale’s format (up to 3 decimals) with the profile’s Unit; true/false as On / Off; JSON shortened to 120 characters |
| Type | Number, On / off, Text or JSON (hidden on narrow screens) |
| Updated | How long ago the value arrived; hover for the date and time |
- Search keys filters by label and key.
- The Type filter shows one kind of value.
- Columns sort by clicking their header.
Live updates
The label above the chart says Live while the page receives values as they are stored, or Updates every 30 s when a live connection is not available and the table is read again every 30 seconds. A value changes in place; a key the device sends for the first time joins the table.
A value appears here only after the root flow saved it. A key the device sends but the root flow does not store never appears.
The trend
Above the table, the Trend chart draws numeric keys over a window:
- Tick up to 4 numeric keys in the table. At first, the chart shows the numeric key that changed most recently.
- Pick the Window: Last hour, Last 6 hours (the default), Last 24 hours or Last 7 days.
The chart is read again every minute. Windows up to 24 hours show every stored reading; Last 7 days shows hourly averages (7 days hold more than 10,000 minutes, so the hour level is used). See Aggregates and rollups.
Only numeric keys can be ticked (“Only a numeric key can be charted.”). Text, On / off and JSON keys show their latest value only. See Numbers, text and true/false values.
Messages you may see
| Message | Meaning |
|---|---|
| “This device has not sent any telemetry yet.” | No value of this device has been stored. Check the connection, then the root flow. |
| “Tick up to 4 numeric keys in the table to chart them.” | No key is ticked, or the device has no numeric key. |
| “No values in this window.” | The ticked keys have no reading in the chosen window. Pick a longer window. |
| “At most 4 keys at a time.” | You ticked more than 4 keys; only 4 are drawn. |
| “Could not load the telemetry.” / “Could not load the chart.” | The read failed. Reload the page; if it persists, check your permissions. |
What the tab does not do
- It has no download button. To download readings, use a dashboard table or chart card with Download data (CSV), or the history API. See Exporting data.
- It shows the device’s own keys only, not attributes. Attributes are on the device’s Attributes tab. See Attributes.
- It does not change the stored data.
Troubleshooting
| Symptom | Check |
|---|---|
| The device shows as online but the tab is empty | The root flow is not storing data: its Save telemetry block is missing, a profile root without one serves this device, or the flows are stopped. See Hosts, the root flow and profile root flows. |
| One key is missing | It broke a key rule, is reserved, or your plan’s key cap is reached. See Telemetry keys. |
| Updated shows an old time though the device reports | The device sends an old or fixed ts. See Timestamps, late and duplicate readings. |
| A key with numbers is listed as Text | The device sends numbers in quotes. |