esp-idf/components/bt/bluedroid/bta/gatt/bta_gattc_main.c

/******************************************************************************
 *
 *  Copyright (C) 2003-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

/******************************************************************************
 *
 *  This file contains the GATT client main functions and state machine.
 *
 ******************************************************************************/

#include "bt_target.h"

#if (GATTC_INCLUDED == TRUE && BLE_INCLUDED == TRUE)

#include <string.h>

#include "bta_gattc_int.h"


/*****************************************************************************
** Constants and types
*****************************************************************************/


/* state machine action enumeration list */
enum {
    BTA_GATTC_OPEN,
    BTA_GATTC_OPEN_FAIL,
    BTA_GATTC_OPEN_ERROR,
    BTA_GATTC_CANCEL_OPEN,
    BTA_GATTC_CANCEL_OPEN_OK,
    BTA_GATTC_CANCEL_OPEN_ERROR,
    BTA_GATTC_CONN,
    BTA_GATTC_START_DISCOVER,
    BTA_GATTC_DISC_CMPL,

    BTA_GATTC_Q_CMD,
    BTA_GATTC_CLOSE,
    BTA_GATTC_CLOSE_FAIL,
    BTA_GATTC_READ,
    BTA_GATTC_WRITE,

    BTA_GATTC_OP_CMPL,
    BTA_GATTC_SEARCH,
    BTA_GATTC_FAIL,
    BTA_GATTC_CONFIRM,
    BTA_GATTC_EXEC,
    BTA_GATTC_READ_MULTI,
    BTA_GATTC_IGNORE_OP_CMPL,
    BTA_GATTC_DISC_CLOSE,
    BTA_GATTC_RESTART_DISCOVER,
    BTA_GATTC_CFG_MTU,

    BTA_GATTC_IGNORE
};
/* type for action functions */
typedef void (*tBTA_GATTC_ACTION)(tBTA_GATTC_CLCB *p_clcb, tBTA_GATTC_DATA *p_data);

/* action function list */
const tBTA_GATTC_ACTION bta_gattc_action[] = {
    bta_gattc_open,
    bta_gattc_open_fail,
    bta_gattc_open_error,
    bta_gattc_cancel_open,
    bta_gattc_cancel_open_ok,
    bta_gattc_cancel_open_error,
    bta_gattc_conn,
    bta_gattc_start_discover,
    bta_gattc_disc_cmpl,

    bta_gattc_q_cmd,
    bta_gattc_close,
    bta_gattc_close_fail,
    bta_gattc_read,
    bta_gattc_write,

    bta_gattc_op_cmpl,
    bta_gattc_search,
    bta_gattc_fail,
    bta_gattc_confirm,
    bta_gattc_execute,
    bta_gattc_read_multi,
    bta_gattc_ignore_op_cmpl,
    bta_gattc_disc_close,
    bta_gattc_restart_discover,
    bta_gattc_cfg_mtu
};


/* state table information */
#define BTA_GATTC_ACTIONS           1       /* number of actions */
#define BTA_GATTC_NEXT_STATE          1       /* position of next state */
#define BTA_GATTC_NUM_COLS            2       /* number of columns in state tables */

/* state table for idle state */
static const UINT8 bta_gattc_st_idle[][BTA_GATTC_NUM_COLS] = {
    /* Event                            Action 1                  Next state */
    /* BTA_GATTC_API_OPEN_EVT           */   {BTA_GATTC_OPEN,              BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_INT_OPEN_FAIL_EVT      */   {BTA_GATTC_IGNORE,            BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_API_CANCEL_OPEN_EVT    */   {BTA_GATTC_IGNORE,            BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_INT_CANCEL_OPEN_OK_EVT */   {BTA_GATTC_IGNORE,            BTA_GATTC_IDLE_ST},

    /* BTA_GATTC_API_READ_EVT           */   {BTA_GATTC_FAIL,              BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_API_WRITE_EVT          */   {BTA_GATTC_FAIL,              BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_API_EXEC_EVT           */   {BTA_GATTC_FAIL,              BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_API_CFG_MTU_EVT        */   {BTA_GATTC_IGNORE,            BTA_GATTC_IDLE_ST},

    /* BTA_GATTC_API_CLOSE_EVT          */   {BTA_GATTC_CLOSE_FAIL,        BTA_GATTC_IDLE_ST},

    /* BTA_GATTC_API_SEARCH_EVT         */   {BTA_GATTC_FAIL,              BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_API_CONFIRM_EVT        */   {BTA_GATTC_FAIL,              BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_API_READ_MULTI_EVT     */   {BTA_GATTC_FAIL,              BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_API_REFRESH_EVT        */   {BTA_GATTC_IGNORE,            BTA_GATTC_IDLE_ST},

    /* BTA_GATTC_INT_CONN_EVT           */   {BTA_GATTC_CONN,              BTA_GATTC_CONN_ST},
    /* BTA_GATTC_INT_DISCOVER_EVT       */   {BTA_GATTC_IGNORE,            BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_DISCOVER_CMPL_EVT      */   {BTA_GATTC_IGNORE,            BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_OP_CMPL_EVT            */   {BTA_GATTC_IGNORE,            BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_INT_DISCONN_EVT       */    {BTA_GATTC_IGNORE,            BTA_GATTC_IDLE_ST},

};

/* state table for wait for open state */
static const UINT8 bta_gattc_st_w4_conn[][BTA_GATTC_NUM_COLS] = {
    /* Event                            Action 1                             Next state */
    /* BTA_GATTC_API_OPEN_EVT           */   {BTA_GATTC_OPEN,              BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_INT_OPEN_FAIL_EVT      */   {BTA_GATTC_OPEN_FAIL,         BTA_GATTC_IDLE_ST},
    /* BTA_GATTC_API_CANCEL_OPEN_EVT    */   {BTA_GATTC_CANCEL_OPEN,       BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_INT_CANCEL_OPEN_OK_EVT */   {BTA_GATTC_CANCEL_OPEN_OK,    BTA_GATTC_IDLE_ST},

    /* BTA_GATTC_API_READ_EVT           */   {BTA_GATTC_FAIL,               BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_API_WRITE_EVT          */   {BTA_GATTC_FAIL,               BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_API_EXEC_EVT           */   {BTA_GATTC_FAIL,               BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_API_CFG_MTU_EVT        */   {BTA_GATTC_IGNORE,             BTA_GATTC_W4_CONN_ST},

    /* BTA_GATTC_API_CLOSE_EVT          */   {BTA_GATTC_CANCEL_OPEN,         BTA_GATTC_W4_CONN_ST},

    /* BTA_GATTC_API_SEARCH_EVT         */   {BTA_GATTC_FAIL,               BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_API_CONFIRM_EVT        */   {BTA_GATTC_FAIL,               BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_API_READ_MULTI_EVT     */   {BTA_GATTC_FAIL,               BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_API_REFRESH_EVT        */   {BTA_GATTC_IGNORE,             BTA_GATTC_W4_CONN_ST},

    /* BTA_GATTC_INT_CONN_EVT           */   {BTA_GATTC_CONN,               BTA_GATTC_CONN_ST},
    /* BTA_GATTC_INT_DISCOVER_EVT       */   {BTA_GATTC_IGNORE,             BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_DISCOVER_CMPL_EVT       */  {BTA_GATTC_IGNORE,             BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_OP_CMPL_EVT            */   {BTA_GATTC_IGNORE,             BTA_GATTC_W4_CONN_ST},
    /* BTA_GATTC_INT_DISCONN_EVT      */     {BTA_GATTC_OPEN_FAIL,          BTA_GATTC_IDLE_ST},

};

/* state table for open state */
static const UINT8 bta_gattc_st_connected[][BTA_GATTC_NUM_COLS] = {
    /* Event                            Action 1                            Next state */
    /* BTA_GATTC_API_OPEN_EVT           */   {BTA_GATTC_OPEN,               BTA_GATTC_CONN_ST},
    /* BTA_GATTC_INT_OPEN_FAIL_EVT      */   {BTA_GATTC_IGNORE,             BTA_GATTC_CONN_ST},
    /* BTA_GATTC_API_CANCEL_OPEN_EVT    */   {BTA_GATTC_CANCEL_OPEN_ERROR, BTA_GATTC_CONN_ST},
    /* BTA_GATTC_INT_CANCEL_OPEN_OK_EVT */   {BTA_GATTC_IGNORE,            BTA_GATTC_CONN_ST},

    /* BTA_GATTC_API_READ_EVT           */   {BTA_GATTC_READ,               BTA_GATTC_CONN_ST},
    /* BTA_GATTC_API_WRITE_EVT          */   {BTA_GATTC_WRITE,              BTA_GATTC_CONN_ST},
    /* BTA_GATTC_API_EXEC_EVT           */   {BTA_GATTC_EXEC,               BTA_GATTC_CONN_ST},
    /* BTA_GATTC_API_CFG_MTU_EVT        */   {BTA_GATTC_CFG_MTU,            BTA_GATTC_CONN_ST},

    /* BTA_GATTC_API_CLOSE_EVT          */   {BTA_GATTC_CLOSE,              BTA_GATTC_IDLE_ST},

    /* BTA_GATTC_API_SEARCH_EVT         */   {BTA_GATTC_SEARCH,             BTA_GATTC_CONN_ST},
    /* BTA_GATTC_API_CONFIRM_EVT        */   {BTA_GATTC_CONFIRM,            BTA_GATTC_CONN_ST},
    /* BTA_GATTC_API_READ_MULTI_EVT     */   {BTA_GATTC_READ_MULTI,         BTA_GATTC_CONN_ST},
    /* BTA_GATTC_API_REFRESH_EVT        */   {BTA_GATTC_IGNORE,             BTA_GATTC_CONN_ST},

    /* BTA_GATTC_INT_CONN_EVT           */   {BTA_GATTC_IGNORE,             BTA_GATTC_CONN_ST},
    /* BTA_GATTC_INT_DISCOVER_EVT       */   {BTA_GATTC_START_DISCOVER,     BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_DISCOVER_CMPL_EVT       */  {BTA_GATTC_IGNORE,             BTA_GATTC_CONN_ST},
    /* BTA_GATTC_OP_CMPL_EVT            */   {BTA_GATTC_OP_CMPL,            BTA_GATTC_CONN_ST},

    /* BTA_GATTC_INT_DISCONN_EVT        */   {BTA_GATTC_CLOSE,              BTA_GATTC_IDLE_ST},

};

/* state table for discover state */
static const UINT8 bta_gattc_st_discover[][BTA_GATTC_NUM_COLS] = {
    /* Event                            Action 1                            Next state */
    /* BTA_GATTC_API_OPEN_EVT           */   {BTA_GATTC_OPEN,               BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_INT_OPEN_FAIL_EVT      */   {BTA_GATTC_IGNORE,             BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_API_CANCEL_OPEN_EVT    */   {BTA_GATTC_CANCEL_OPEN_ERROR,  BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_INT_CANCEL_OPEN_OK_EVT */   {BTA_GATTC_FAIL,               BTA_GATTC_DISCOVER_ST},

    /* BTA_GATTC_API_READ_EVT           */   {BTA_GATTC_Q_CMD,              BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_API_WRITE_EVT          */   {BTA_GATTC_Q_CMD,              BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_API_EXEC_EVT           */   {BTA_GATTC_Q_CMD,              BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_API_CFG_MTU_EVT        */   {BTA_GATTC_Q_CMD,              BTA_GATTC_DISCOVER_ST},

    /* BTA_GATTC_API_CLOSE_EVT          */   {BTA_GATTC_DISC_CLOSE,         BTA_GATTC_DISCOVER_ST},

    /* BTA_GATTC_API_SEARCH_EVT         */   {BTA_GATTC_Q_CMD,              BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_API_CONFIRM_EVT        */   {BTA_GATTC_CONFIRM,            BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_API_READ_MULTI_EVT     */   {BTA_GATTC_Q_CMD,              BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_API_REFRESH_EVT        */   {BTA_GATTC_IGNORE,             BTA_GATTC_DISCOVER_ST},

    /* BTA_GATTC_INT_CONN_EVT           */   {BTA_GATTC_IGNORE,             BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_INT_DISCOVER_EVT       */   {BTA_GATTC_RESTART_DISCOVER,   BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_DISCOVER_CMPL_EVT      */   {BTA_GATTC_DISC_CMPL,          BTA_GATTC_CONN_ST},
    /* BTA_GATTC_OP_CMPL_EVT            */   {BTA_GATTC_IGNORE_OP_CMPL,     BTA_GATTC_DISCOVER_ST},
    /* BTA_GATTC_INT_DISCONN_EVT        */   {BTA_GATTC_CLOSE,              BTA_GATTC_IDLE_ST},

};

/* type for state table */
typedef const UINT8 (*tBTA_GATTC_ST_TBL)[BTA_GATTC_NUM_COLS];

/* state table */
const tBTA_GATTC_ST_TBL bta_gattc_st_tbl[] = {
    bta_gattc_st_idle,
    bta_gattc_st_w4_conn,
    bta_gattc_st_connected,
    bta_gattc_st_discover
};

/*****************************************************************************
** Global data
*****************************************************************************/

/* GATTC control block */
#if BTA_DYNAMIC_MEMORY == FALSE
tBTA_GATTC_CB  bta_gattc_cb;
#endif

#if BTA_GATT_DEBUG == TRUE
static char *gattc_evt_code(tBTA_GATTC_INT_EVT evt_code);
static char *gattc_state_code(tBTA_GATTC_STATE state_code);
#endif

/*******************************************************************************
**
** Function         bta_gattc_sm_execute
**
** Description      State machine event handling function for GATTC
**
**
** Returns          BOOLEAN  : TRUE if queued client request buffer can be immediately released
**                                        else FALSE
**
*******************************************************************************/
BOOLEAN bta_gattc_sm_execute(tBTA_GATTC_CLCB *p_clcb, UINT16 event, tBTA_GATTC_DATA *p_data)
{
    tBTA_GATTC_ST_TBL     state_table;
    UINT8               action;
    int                 i;
    BOOLEAN             rt = TRUE;
#if BTA_GATT_DEBUG == TRUE
    tBTA_GATTC_STATE in_state = p_clcb->state;
    UINT16         in_event = event;
    APPL_TRACE_DEBUG("bta_gattc_sm_execute: State 0x%02x [%s], Event 0x%x[%s]", in_state,
                     gattc_state_code(in_state),
                     in_event,
                     gattc_evt_code(in_event));
#endif


    /* look up the state table for the current state */
    state_table = bta_gattc_st_tbl[p_clcb->state];

    event &= 0x00FF;

    /* set next state */
    p_clcb->state = state_table[event][BTA_GATTC_NEXT_STATE];

    /* execute action functions */
    for (i = 0; i < BTA_GATTC_ACTIONS; i++) {
        if ((action = state_table[event][i]) != BTA_GATTC_IGNORE) {
            (*bta_gattc_action[action])(p_clcb, p_data);
            if (p_clcb->p_q_cmd == p_data) {
                /* buffer is queued, don't free in the bta dispatcher.
                 * we free it ourselves when a completion event is received.
                 */
                rt = FALSE;
            }
        } else {
            break;
        }
    }

#if BTA_GATT_DEBUG == TRUE
    if (in_state != p_clcb->state) {
        APPL_TRACE_DEBUG("GATTC State Change: [%s] -> [%s] after Event [%s]",
                         gattc_state_code(in_state),
                         gattc_state_code(p_clcb->state),
                         gattc_evt_code(in_event));
    }
#endif
    return rt;
}

/*******************************************************************************
**
** Function         bta_gattc_hdl_event
**
** Description      GATT client main event handling function.
**
**
** Returns          BOOLEAN
**
*******************************************************************************/
BOOLEAN bta_gattc_hdl_event(BT_HDR *p_msg)
{
    tBTA_GATTC_CB *p_cb = &bta_gattc_cb;
    tBTA_GATTC_CLCB *p_clcb = NULL;
    tBTA_GATTC_RCB      *p_clreg;
    BOOLEAN             rt = TRUE;
#if BTA_GATT_DEBUG == TRUE
    APPL_TRACE_DEBUG("bta_gattc_hdl_event: Event [%s]\n", gattc_evt_code(p_msg->event));
#endif
    switch (p_msg->event) {
    case BTA_GATTC_API_DISABLE_EVT:
        bta_gattc_disable(p_cb);
        break;

    case BTA_GATTC_API_REG_EVT:
        bta_gattc_register(p_cb, (tBTA_GATTC_DATA *) p_msg);
        break;

    case BTA_GATTC_INT_START_IF_EVT:
        bta_gattc_start_if(p_cb, (tBTA_GATTC_DATA *) p_msg);
        break;

    case BTA_GATTC_API_DEREG_EVT:
        p_clreg = bta_gattc_cl_get_regcb(((tBTA_GATTC_DATA *)p_msg)->api_dereg.client_if);
        bta_gattc_deregister(p_cb, p_clreg);
        break;

    case BTA_GATTC_API_OPEN_EVT:
        bta_gattc_process_api_open(p_cb, (tBTA_GATTC_DATA *) p_msg);
        break;

    case BTA_GATTC_API_CANCEL_OPEN_EVT:
        bta_gattc_process_api_open_cancel(p_cb, (tBTA_GATTC_DATA *) p_msg);
        break;

    case BTA_GATTC_API_REFRESH_EVT:
        bta_gattc_process_api_refresh(p_cb, (tBTA_GATTC_DATA *) p_msg);
        break;

#if BLE_INCLUDED == TRUE
    case BTA_GATTC_API_LISTEN_EVT:
        bta_gattc_listen(p_cb, (tBTA_GATTC_DATA *) p_msg);
        break;
    case BTA_GATTC_API_BROADCAST_EVT:
        bta_gattc_broadcast(p_cb, (tBTA_GATTC_DATA *) p_msg);
        break;
#endif

    case BTA_GATTC_ENC_CMPL_EVT:
        bta_gattc_process_enc_cmpl(p_cb, (tBTA_GATTC_DATA *) p_msg);
        break;

    default:
        if (p_msg->event == BTA_GATTC_INT_CONN_EVT) {
            p_clcb = bta_gattc_find_int_conn_clcb((tBTA_GATTC_DATA *) p_msg);
            p_clreg = bta_gattc_cl_get_regcb(((tBTA_GATTC_DATA *)p_msg)->int_conn.client_if);
            if (p_clreg != NULL){
                bta_gattc_conncback(p_clreg, (tBTA_GATTC_DATA *) p_msg);
            }

        } else if (p_msg->event == BTA_GATTC_INT_DISCONN_EVT) {
            p_clreg = bta_gattc_cl_get_regcb(((tBTA_GATTC_DATA *)p_msg)->int_conn.client_if);
            if (p_clreg != NULL){
                bta_gattc_disconncback(p_clreg, (tBTA_GATTC_DATA *) p_msg);
            }
            p_clcb = bta_gattc_find_int_disconn_clcb((tBTA_GATTC_DATA *) p_msg);
        } else {
            p_clcb = bta_gattc_find_clcb_by_conn_id(p_msg->layer_specific);
        }

        if (p_clcb != NULL) {
            rt = bta_gattc_sm_execute(p_clcb, p_msg->event, (tBTA_GATTC_DATA *) p_msg);
        } else {
            APPL_TRACE_DEBUG("Ignore unknown conn ID: %d\n", p_msg->layer_specific);
        }

        break;
    }


    return rt;
}


/*****************************************************************************
**  Debug Functions
*****************************************************************************/
#if BTA_GATT_DEBUG == TRUE

/*******************************************************************************
**
** Function         gattc_evt_code
**
** Description
**
** Returns          void
**
*******************************************************************************/
static char *gattc_evt_code(tBTA_GATTC_INT_EVT evt_code)
{
    switch (evt_code) {
    case BTA_GATTC_API_OPEN_EVT:
        return "BTA_GATTC_API_OPEN_EVT";
    case BTA_GATTC_INT_OPEN_FAIL_EVT:
        return "BTA_GATTC_INT_OPEN_FAIL_EVT";
    case BTA_GATTC_API_CANCEL_OPEN_EVT:
        return "BTA_GATTC_API_CANCEL_OPEN_EVT";
    case BTA_GATTC_INT_CANCEL_OPEN_OK_EVT:
        return "BTA_GATTC_INT_CANCEL_OPEN_OK_EVT";
    case BTA_GATTC_API_READ_EVT:
        return "BTA_GATTC_API_READ_EVT";
    case BTA_GATTC_API_WRITE_EVT:
        return "BTA_GATTC_API_WRITE_EVT";
    case BTA_GATTC_API_EXEC_EVT:
        return "BTA_GATTC_API_EXEC_EVT";
    case BTA_GATTC_API_CLOSE_EVT:
        return "BTA_GATTC_API_CLOSE_EVT";
    case BTA_GATTC_API_SEARCH_EVT:
        return "BTA_GATTC_API_SEARCH_EVT";
    case BTA_GATTC_API_CONFIRM_EVT:
        return "BTA_GATTC_API_CONFIRM_EVT";
    case BTA_GATTC_API_READ_MULTI_EVT:
        return "BTA_GATTC_API_READ_MULTI_EVT";
    case BTA_GATTC_INT_CONN_EVT:
        return "BTA_GATTC_INT_CONN_EVT";
    case BTA_GATTC_INT_DISCOVER_EVT:
        return "BTA_GATTC_INT_DISCOVER_EVT";
    case BTA_GATTC_DISCOVER_CMPL_EVT:
        return "BTA_GATTC_DISCOVER_CMPL_EVT";
    case BTA_GATTC_OP_CMPL_EVT:
        return "BTA_GATTC_OP_CMPL_EVT";
    case BTA_GATTC_INT_DISCONN_EVT:
        return "BTA_GATTC_INT_DISCONN_EVT";
    case BTA_GATTC_INT_START_IF_EVT:
        return "BTA_GATTC_INT_START_IF_EVT";
    case BTA_GATTC_API_REG_EVT:
        return "BTA_GATTC_API_REG_EVT";
    case BTA_GATTC_API_DEREG_EVT:
        return "BTA_GATTC_API_DEREG_EVT";
    case BTA_GATTC_API_REFRESH_EVT:
        return "BTA_GATTC_API_REFRESH_EVT";
    case BTA_GATTC_API_LISTEN_EVT:
        return "BTA_GATTC_API_LISTEN_EVT";
    case BTA_GATTC_API_DISABLE_EVT:
        return "BTA_GATTC_API_DISABLE_EVT";
    case BTA_GATTC_API_CFG_MTU_EVT:
        return "BTA_GATTC_API_CFG_MTU_EVT";
    default:
        return "unknown GATTC event code";
    }
}

/*******************************************************************************
**
** Function         gattc_state_code
**
** Description
**
** Returns          void
**
*******************************************************************************/
static char *gattc_state_code(tBTA_GATTC_STATE state_code)
{
    switch (state_code) {
    case BTA_GATTC_IDLE_ST:
        return "GATTC_IDLE_ST";
    case BTA_GATTC_W4_CONN_ST:
        return "GATTC_W4_CONN_ST";
    case BTA_GATTC_CONN_ST:
        return "GATTC_CONN_ST";
    case BTA_GATTC_DISCOVER_ST:
        return "GATTC_DISCOVER_ST";
    default:
        return "unknown GATTC state code";
    }
}

#endif  /* Debug Functions */
#endif /* GATTC_INCLUDED == TRUE && BLE_INCLUDED == TRUE */