This module implements the Battery Service with the Battery Level characteristic. During initialization it adds the Battery Service and Battery Level characteristic to the BLE stack database. Optionally it can also add a Report Reference descriptor to the Battery Level characteristic (used when including the Battery Service in the HID service).

If specified, the module will support notification of the Battery Level characteristic through the ble_bas_battery_level_update() function. If an event handler is supplied by the application, the Battery Service will generate Battery Service events to the application.

Note: The application must propagate BLE stack events to the Battery Service module by calling ble_bas_on_ble_evt() from the from the ble_stack_handler callback.