nus.h

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/*
 * Copyright (c) 2018 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
 
#ifndef BT_NUS_H_
#define BT_NUS_H_
 
#include <zephyr/types.h>
#include <zephyr/bluetooth/conn.h>
#include <zephyr/bluetooth/uuid.h>
#include <zephyr/bluetooth/gatt.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define BT_UUID_NUS_VAL \
        BT_UUID_128_ENCODE(0x6e400001, 0xb5a3, 0xf393, 0xe0a9, 0xe50e24dcca9e)
 
#define BT_UUID_NUS_TX_VAL \
        BT_UUID_128_ENCODE(0x6e400003, 0xb5a3, 0xf393, 0xe0a9, 0xe50e24dcca9e)
 
#define BT_UUID_NUS_RX_VAL \
        BT_UUID_128_ENCODE(0x6e400002, 0xb5a3, 0xf393, 0xe0a9, 0xe50e24dcca9e)
 
#define BT_UUID_NUS_SERVICE   BT_UUID_DECLARE_128(BT_UUID_NUS_VAL)
#define BT_UUID_NUS_RX        BT_UUID_DECLARE_128(BT_UUID_NUS_RX_VAL)
#define BT_UUID_NUS_TX        BT_UUID_DECLARE_128(BT_UUID_NUS_TX_VAL)
 
enum bt_nus_send_status {
        BT_NUS_SEND_STATUS_ENABLED,
        BT_NUS_SEND_STATUS_DISABLED,
};
 
struct bt_nus_cb {
        void (*received)(struct bt_conn *conn,
                         const uint8_t *const data, uint16_t len);
 
        void (*sent)(struct bt_conn *conn);
 
        void (*send_enabled)(enum bt_nus_send_status status);
 
};
 
int bt_nus_init(struct bt_nus_cb *callbacks);
 
int bt_nus_send(struct bt_conn *conn, const uint8_t *data, uint16_t len);
 
static inline uint32_t bt_nus_get_mtu(struct bt_conn *conn)
{
        /* According to 3.4.7.1 Handle Value Notification off the ATT protocol.
         * Maximum supported notification is ATT_MTU - 3 */
        return bt_gatt_get_mtu(conn) - 3;
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* BT_NUS_H_ */