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
			ble_peer_event	Sink modules for ble_peer_event
			module_state_event	Sink modules for module_state_event

Note

See the Overview: Firmware architecture 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 Bluetooth in nRF Desktop.

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.