With the advent of Bluetooth Low Energy, a technology which is rapidly maturing, it has already started to find its way into a variety of premises.
iTags are small Bluetooth Low Energy sensors, which can be planted on things or individuals (especially toddlers) to track whether the iTag is nearby or far away:
Figure 4: iTag; source: www.amazon.com
You can buy an iTag for a few Euros online or at a nearby electronics shop.
The Bluetooth implementation of an iTag usually consists of a Link Loss and Immediate Alert Service.
Note
To read more about the Immediate Alert Service in detail, visit https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.service.immediate_alert.xml.
Apart from many other functionalities, the Immediate Alert and Link Loss services are used for providing alerts when the device link is lost.
Note
To read more about the Link Loss Service in detail, visit https://www.bluetooth.com/specifications/gatt/viewer...