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doc: relnotes: Add Bluetooth release notes for 2.4

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Contains Host, Mesh and Controller release notes for the 2.4 release.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
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Carles Cufi 2020-09-25 21:35:18 +02:00 • committed by Maureen Helm
commit ad940e6170
1 changed files with 61 additions and 3 deletions
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doc/releases/release-notes-2.4.rst
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@ -156,6 +156,16 @@ Stable API changes in this release
* HID class callbacks now takes a parameter ``const struct device*`` which
is the HID device for which callback was called.
* Bluetooth:
* The ``_gatt_`` infix has been removed from all GATT service APIs.
* Bluetooth HCI Driver:
* bt_hci_evt_is_prio() removed, use bt_hci_evt_get_flags() instead when
CONFIG_BT_RECV_IS_RX_THREAD is defined and call bt_recv and bt_recv_prio
when their flag is set, otherwise always call bt_recv().
Kernel
******
@ -614,14 +624,62 @@ Bluetooth
* Host:
* Added basic support for Isochronous Channels (also known as LE Audio).
* Added support for Periodic Advertising (both Advertising and Scanning
procedures).
* The application can now specify preferences for the PHY update procedure PHY
choices.
* A new "bond_deleted" callback has been introduced.
* Added a new callback for GATT (un)subscription.
* Added support for the application to provide subscription information to the
stack prior to reconnection (``bt_gatt_resubscribe``).
* The application can now request for the CCC descriptor to be discovered
automatically by the stack when subscribing to a characteristic.
* Fixed a regression introduced in 2.3 along the EATT feature, where the ATT
throughput could not reach the expected values.
* Fixed a deadlock in the RX thread that was observed multiple times in
scenarios involving high throughput and a sudden disconnection.
* Fixed a race condition upon advertising resume.
* The GATT notify multiple feature is now disabled by default.
* The advertiser can now be requested to restart even when a connection
object is not available.
* The L2CAP security level will now be elevated automatically when a
connection is rejected for security reasons.
* When LE Secure Connections are the only option enabled, the security level
will now be elevated to Level 4 automatically.
* Fixed CCC restoring when using settings lazy loading.
* Fixed recombination of ACL L2CAP PDUs when the header itself is split across
multiple HCI ACL packets.
* GATT no longer assumes the position of the CCC descriptor and instead
discovers it.
* Multiple additional fixes.
* Mesh:
* Added support for storage of model data in a key-value fashion.
* Added support for a network loopback.
* Multiple qualification-related fixes.
* BLE split software Controller:
* The advanced scheduling algorithms that were supported in the legacy
Controller have been ported to the split one.
* Preliminary support for Advertising Extensions, restricted to
non-connectable advertising for now.
* Very early support for Periodic Advertising. This should be considered an
early experimental draft at this stage.
* Added full support for the Nordic nRF5340 IC, not just the engineering
sample.
* Added support for the Nordic nRF52805 IC.
* Several fixes to scheduling and window calculation, some of which had an
impact in the cooperation between the flash driver and the Controller.
* Fixed an null pointer dereference in the ticker code.
* HCI Driver:
* bt_hci_evt_is_prio() removed, use bt_hci_evt_get_flags() instead when
CONFIG_BT_RECV_IS_RX_THREAD is defined and call bt_recv and bt_recv_prio
when their flag is set, otherwise always call bt_recv().
* A new BT_QUIRK_NO_AUTO_DLE has been added for Controllers that do not follow
the recommendation of auto-initating the data length update procedure. This
is in fact the case of the split software Controller.
Build and Infrastructure
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