This includes the actual RF radio.īluetooth Low Energy shares some similarities with Classic Bluetooth. The physical layer is in charge of actually sending the signals over the air. BLE Physical Layerīefore we get into how advertisement packets are sent, we want to talk a little about the BLE physical layer. But a single peripheral can advertise to multiple masters in the area. A Central device can’t send any data to the Peripheral device without a connection. Advertisements are the core of iBeacon, EddyStone and other beacons, so they're used all the timeĪdvertising is by design unidirectional.
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