You can use Offline Alerts to get notified when a Device has not transmitted any data in a certain time period.
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Create new Offline Alert
To create an Offline alert for your device, expand the location menu and select Alerts.
Select Create Alert.
In the Create Alert options, be sure to select Online/Offline in the Alert Type dropdown.
You can then specify the time period for how long the device must be offline (no data points sent) and which Contacts should be notified. Contacts will receive notifications for both Offline events as well as when the device returns to an Online state.
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