Battery Service Server API
src/ble/gatt-service/battery_service_server.h
/**
* @brief Init Battery Service Server with ATT DB
* @param battery_value in range 0-100
*/
void battery_service_server_init(uint8_t battery_value);
/**
* @brief Update battery value
* @note triggers notifications if subscribed
* @param battery_value in range 0-100
*/
void battery_service_server_set_battery_value(uint8_t battery_value);