Bluetooth LE state module

In nRF Desktop, the Bluetooth® LE state module is responsible for the following actions:

• Enabling Bluetooth (bt_enable()).

• Handling Zephyr connection callbacks (bt_conn_cb).

• Propagating information about the connection state and parameters by using Application Event Manager events.

Module events

Source Module	Input Event	This Module	Output Event	Sink Module
Source modules for module_state_event	module_state_event	ble_state
Bluetooth LE advertising module	ble_peer_event
Bluetooth LE state module
			ble_peer_conn_params_event	Bluetooth LE connection parameters module
				Bluetooth LE latency module
				DVFS module
			ble_peer_event	Sink modules for ble_peer_event
			module_state_event	Sink modules for module_state_event

Note

See the Application overview for more information about the event-based communication in the nRF Desktop application and about how to read this table.

Configuration

nRF Desktop uses the Bluetooth LE state module from Common Application Framework (CAF). The CONFIG_DESKTOP_BLE_STATE Kconfig option selects the CONFIG_CAF_BLE_STATE option.

For more information about Bluetooth configuration in nRF Desktop, see nRF Desktop: Bluetooth.

Implementation details

The Bluetooth LE state module handles, among others, Zephyr’s connection parameters update request callback. The module rejects a connection parameters update request and submits the ble_peer_conn_params_event event. The event is handled by the Bluetooth LE connection parameters module, which updates the connection parameters.

For information on implementation details, see the CAF Bluetooth LE state page.