When using BLE, an Android device can act as a peripheral device, a central device, or both. Peripheral mode lets devices send advertisement packets. Central mode lets devices scan for advertisements. … Devices supporting Bluetooth 4.1 and earlier can only use BLE in central mode.

What is central and peripheral in BLE?

One important concept in BLE connectivity is the difference between a master device and a slave device. … Master / Central – the BLE device which initiates an outgoing connection request to an advertising peripheral device. Slave / Peripheral – the BLE device which accepts an incoming connection request after advertising.

What is a BLE used for?

Bluetooth Low Energy (BLE) is a form of wireless communication designed especially for short-range communication. BLE is very similar to Wi-Fi in the sense that it allows devices to communicate with each other. However, BLE is meant for situations where battery life is preferred over high data transfer speeds.