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Device Inactivity Alarm

Monitor HMI Device connectivity and automatically create or clear an alarm when a HMI Device stops sending data.

Use case

Section titled “Use case”

Thermometer A1 (thermostat profile) sends temperature telemetry to iRis Cloud. When it stops reporting data, iRis Cloud marks it inactive and raises a HMI Device inactive alarm. When the HMI Device reconnects, the alarm clears automatically.

This recipe uses an Alarm Rule approach: no-code, scoped to a device profile, and best for standard inactivity monitoring.

Prerequisites

Section titled “Prerequisites”

Create a HMI Device (see Register a License to a HMI Device for the access token and license steps), then set its profile from the details panel:

  • Name: Thermometer A1
  • Device profile: thermostat — open the HMI Device, click the edit (pencil) button, select the profile, and click Apply changes.

iRis Cloud’s Device State service automatically maintains two server attributes on every device:

  • active — true when the device is active, false when inactive
  • inactivityAlarmTime — timestamp of the last inactivity event

Alarm Rule

Section titled “Alarm Rule”

You can import a ready-made alarm rule or build it manually.

Option 1. Import alarm rule

  • Download the HMI Device Active/Inactive alarm rule as JSON file and import it into your instance.

When importing, set the thermostat as the target device profile.

Option 2. Create manually

Go to Alarms ⇾ Alarm rules and click + Add alarm rule ⇾ Create new alarm rule.

Step 1. Configure general settings

Section titled “Step 1. Configure general settings”

In the Alarm rule dialog, set:

  • Alarm type: Device inactive
  • Entity type: Device profile
  • Device profile: thermostat (here specify the device type of your device)

Step 2. Add argument

Section titled “Step 2. Add argument”

Click Add argument and configure it to read the active server attribute:

  • Entity type: Current entity
  • Argument type: Attribute
  • Attribute scope: Server attributes
  • Attribute key: active
  • Argument name: active

Step 3. Add trigger condition

Section titled “Step 3. Add trigger condition”

In the Trigger conditions section, set Severity to Critical, then click Add condition and configure:

  • Mode: Script
  • Script: 
    return active == false;

Step 4. Add clear condition

Section titled “Step 4. Add clear condition”

Scroll down to Clear condition, click Add clear condition, and configure:

  • Mode: Script
  • Script: 
    return active == true;

Click Add to save the alarm rule.

Step 5. Verify

Section titled “Step 5. Verify”

Open Thermometer A1 ⇾ Attributes ⇾ Server attributes. iRis Cloud writes active and inactivityAlarmTime automatically.

To simulate inactivity, edit the active attribute and set it to false:

Open Thermometer A1 ⇾ Alarms. A HMI Device inactive Critical alarm appears:

Set active back to true to clear the alarm:

See also

Section titled “See also”
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