| /** @file |
| * @brief CTS Service sample |
| */ |
| |
| /* |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <zephyr/types.h> |
| #include <stddef.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <misc/printk.h> |
| #include <misc/byteorder.h> |
| #include <zephyr.h> |
| |
| #include <bluetooth/bluetooth.h> |
| #include <bluetooth/hci.h> |
| #include <bluetooth/conn.h> |
| #include <bluetooth/uuid.h> |
| #include <bluetooth/gatt.h> |
| |
| static struct bt_gatt_ccc_cfg ct_ccc_cfg[BT_GATT_CCC_MAX] = {}; |
| static u8_t ct[10]; |
| static u8_t ct_update; |
| |
| static void ct_ccc_cfg_changed(const struct bt_gatt_attr *attr, u16_t value) |
| { |
| /* TODO: Handle value */ |
| } |
| |
| static ssize_t read_ct(struct bt_conn *conn, const struct bt_gatt_attr *attr, |
| void *buf, u16_t len, u16_t offset) |
| { |
| const char *value = attr->user_data; |
| |
| return bt_gatt_attr_read(conn, attr, buf, len, offset, value, |
| sizeof(ct)); |
| } |
| |
| static ssize_t write_ct(struct bt_conn *conn, const struct bt_gatt_attr *attr, |
| const void *buf, u16_t len, u16_t offset, |
| u8_t flags) |
| { |
| u8_t *value = attr->user_data; |
| |
| if (offset + len > sizeof(ct)) { |
| return BT_GATT_ERR(BT_ATT_ERR_INVALID_OFFSET); |
| } |
| |
| memcpy(value + offset, buf, len); |
| ct_update = 1; |
| |
| return len; |
| } |
| |
| /* Current Time Service Declaration */ |
| static struct bt_gatt_attr attrs[] = { |
| BT_GATT_PRIMARY_SERVICE(BT_UUID_CTS), |
| BT_GATT_CHARACTERISTIC(BT_UUID_CTS_CURRENT_TIME, BT_GATT_CHRC_READ | |
| BT_GATT_CHRC_NOTIFY | BT_GATT_CHRC_WRITE), |
| BT_GATT_DESCRIPTOR(BT_UUID_CTS_CURRENT_TIME, |
| BT_GATT_PERM_READ | BT_GATT_PERM_WRITE, |
| read_ct, write_ct, ct), |
| BT_GATT_CCC(ct_ccc_cfg, ct_ccc_cfg_changed), |
| }; |
| |
| static struct bt_gatt_service cts_svc = BT_GATT_SERVICE(attrs); |
| |
| static void generate_current_time(u8_t *buf) |
| { |
| u16_t year; |
| |
| /* 'Exact Time 256' contains 'Day Date Time' which contains |
| * 'Date Time' - characteristic contains fields for: |
| * year, month, day, hours, minutes and seconds. |
| */ |
| |
| year = sys_cpu_to_le16(2015); |
| memcpy(buf, &year, 2); /* year */ |
| buf[2] = 5; /* months starting from 1 */ |
| buf[3] = 30; /* day */ |
| buf[4] = 12; /* hours */ |
| buf[5] = 45; /* minutes */ |
| buf[6] = 30; /* seconds */ |
| |
| /* 'Day of Week' part of 'Day Date Time' */ |
| buf[7] = 1; /* day of week starting from 1 */ |
| |
| /* 'Fractions 256 part of 'Exact Time 256' */ |
| buf[8] = 0; |
| |
| /* Adjust reason */ |
| buf[9] = 0; /* No update, change, etc */ |
| } |
| |
| void cts_init(void) |
| { |
| /* Simulate current time for Current Time Service */ |
| generate_current_time(ct); |
| |
| bt_gatt_service_register(&cts_svc); |
| } |
| |
| void cts_notify(void) |
| { /* Current Time Service updates only when time is changed */ |
| if (!ct_update) { |
| return; |
| } |
| |
| ct_update = 0; |
| bt_gatt_notify(NULL, &attrs[3], &ct, sizeof(ct)); |
| } |