As discussed in previous parts of this series, from the Bluetooth Low Energy Specification point of view, Bluetooth 4.2 supports new features that make BLE-based wireless systems faster, more secure, and more power efficient. These features—Data Length Extension (DLE), Low Energy (LE) Secure Connections, and Link Layer (LL) Privacy—require an upgrade to either the LL controller or the BLE host stack, or both. Thus, to add these features to an application, system designers require
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