Bluetooth 5.1

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