| /** @file |
| * @brief GATT Battery Service |
| */ |
| |
| /* |
| * Copyright (c) 2018 Nordic Semiconductor ASA |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <errno.h> |
| #include <init.h> |
| #include <sys/__assert.h> |
| #include <stdbool.h> |
| #include <zephyr/types.h> |
| |
| #include <bluetooth/bluetooth.h> |
| #include <bluetooth/conn.h> |
| #include <bluetooth/gatt.h> |
| #include <bluetooth/uuid.h> |
| #include <bluetooth/services/bas.h> |
| |
| #define LOG_LEVEL CONFIG_BT_BAS_LOG_LEVEL |
| #include <logging/log.h> |
| LOG_MODULE_REGISTER(bas); |
| |
| static uint8_t battery_level = 100U; |
| |
| static void blvl_ccc_cfg_changed(const struct bt_gatt_attr *attr, |
| uint16_t value) |
| { |
| ARG_UNUSED(attr); |
| |
| bool notif_enabled = (value == BT_GATT_CCC_NOTIFY); |
| |
| LOG_INF("BAS Notifications %s", notif_enabled ? "enabled" : "disabled"); |
| } |
| |
| static ssize_t read_blvl(struct bt_conn *conn, |
| const struct bt_gatt_attr *attr, void *buf, |
| uint16_t len, uint16_t offset) |
| { |
| uint8_t lvl8 = battery_level; |
| |
| return bt_gatt_attr_read(conn, attr, buf, len, offset, &lvl8, |
| sizeof(lvl8)); |
| } |
| |
| BT_GATT_SERVICE_DEFINE(bas, |
| BT_GATT_PRIMARY_SERVICE(BT_UUID_BAS), |
| BT_GATT_CHARACTERISTIC(BT_UUID_BAS_BATTERY_LEVEL, |
| BT_GATT_CHRC_READ | BT_GATT_CHRC_NOTIFY, |
| BT_GATT_PERM_READ, read_blvl, NULL, |
| &battery_level), |
| BT_GATT_CCC(blvl_ccc_cfg_changed, |
| BT_GATT_PERM_READ | BT_GATT_PERM_WRITE), |
| ); |
| |
| static int bas_init(const struct device *dev) |
| { |
| ARG_UNUSED(dev); |
| |
| return 0; |
| } |
| |
| uint8_t bt_bas_get_battery_level(void) |
| { |
| return battery_level; |
| } |
| |
| int bt_bas_set_battery_level(uint8_t level) |
| { |
| int rc; |
| |
| if (level > 100U) { |
| return -EINVAL; |
| } |
| |
| battery_level = level; |
| |
| rc = bt_gatt_notify(NULL, &bas.attrs[1], &level, sizeof(level)); |
| |
| return rc == -ENOTCONN ? 0 : rc; |
| } |
| |
| SYS_INIT(bas_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY); |