applications: nrf_desktop: Update first HID report delay for keyboards

Change updates first HID report delay for keyboards to make sure that
the input is not lost on reconnection with the nRF Desktop dongle.

Jira: NCSDK-34348

Signed-off-by: Marek Pieta <[email protected]>
Signed-off-by: Anna Wojdylo <[email protected]>

Author: MarekPieta

applications/nrf_desktop/doc/hids.rst

@@ -76,7 +76,7 @@ Sending the first HID report to the connected Bluetooth peer is delayed by this
 .. note::
    The nRF Desktop centrals perform the GATT service discovery and reenable the HID notifications on every reconnection.
    A HID report that is received before the subscription is reenabled will be dropped before it reaches the application.
-   The :ref:`CONFIG_DESKTOP_HIDS_FIRST_REPORT_DELAY <config_desktop_app_options>` option is set to 500 ms for nRF Desktop keyboards (:ref:`CONFIG_DESKTOP_PERIPHERAL_TYPE_KEYBOARD <config_desktop_app_options>`) to make sure that the input is not lost on reconnection with the nRF Desktop dongle.
+   The :ref:`CONFIG_DESKTOP_HIDS_FIRST_REPORT_DELAY <config_desktop_app_options>` option is set to 1000 ms for nRF Desktop keyboards (:ref:`CONFIG_DESKTOP_PERIPHERAL_TYPE_KEYBOARD <config_desktop_app_options>`) to make sure that the input is not lost on reconnection with the nRF Desktop dongle.
 
 Implementation details
 **********************

applications/nrf_desktop/src/modules/Kconfig.hids

@@ -18,7 +18,7 @@ if DESKTOP_HIDS_ENABLE
 
 config DESKTOP_HIDS_FIRST_REPORT_DELAY
 	int "First HID report delay [ms]"
-	default 500 if DESKTOP_PERIPHERAL_TYPE_KEYBOARD
+	default 1000 if DESKTOP_PERIPHERAL_TYPE_KEYBOARD
 	default 0
 	range 0 2000
 	help
@@ -28,7 +28,7 @@ config DESKTOP_HIDS_FIRST_REPORT_DELAY
 	  centrals reenable the subscriptions on every reconnection. HID report
 	  is dropped if received before the subscription was reenabled.
 
-	  By default, nRF Desktop keyboard uses a delay of 500 ms to prevent
+	  By default, nRF Desktop keyboard uses a delay of 1000 ms to prevent
 	  dropping HID reports right after reconnection.
 
 config DESKTOP_HIDS_SUBSCRIBER_PRIORITY

doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst

@@ -307,6 +307,8 @@ nRF Desktop
     Extra ATT buffers are no longer needed for keyboards as :ref:`nrf_desktop_hids` limits the maximum number of simultaneously processed HID input reports (:ref:`CONFIG_DESKTOP_HIDS_SUBSCRIBER_REPORT_MAX <config_desktop_app_options>`) to ``2`` by default.
   * The nRF Desktop application aligns the defaults of :kconfig:option:`CONFIG_BT_ATT_TX_COUNT` and :kconfig:option:`CONFIG_BT_CONN_TX_MAX` Kconfig options to application needs.
     The options are no longer explicitly set in application configurations.
+  * Increased the default first HID report delay (:ref:`CONFIG_DESKTOP_HIDS_FIRST_REPORT_DELAY <config_desktop_app_options>`) for keyboard (:ref:`CONFIG_DESKTOP_PERIPHERAL_TYPE_KEYBOARD <config_desktop_app_options>`) in :ref:`nrf_desktop_hids` from ``500 ms`` to ``1000 ms``.
+    This change ensures that queued keypresses are not lost when reconnecting with the nRF Desktop dongle.
 
 nRF Machine Learning (Edge Impulse)
 -----------------------------------