- Bluetooth 5.1

The Bluetooth SIG presented Bluetooth 5.1 on 21 January 2019.

The major areas of improvement are:

Angle of Arrival (AoA) and Angle of Departure (AoD) which are used for locating and tracking of devices
Advertising Channel Index
GATT Caching
Minor Enhancements batch 1:
- HCI support for debug keys in LE Secure Connections
- Sleep clock accuracy update mechanism
- ADI field in scan response data
- Interaction between QoS and Flow Specification
- Block Host channel classification for secondary advertising
- Allow the SID to appear in scan response reports
- Specify the behavior when rules are violated
Periodic Advertising Sync Transfer

Features Added in Core Specification Addendum (CSA) 6 – Integrated in v5.1:

Models
Mesh-based model hierarchy

The following features were removed in this version of the specification:

Unit keys

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