esp-idf/components/bt/host/bluedroid/stack/gap/gap_ble.c

/******************************************************************************
 *
 *  Copyright (C) 2009-2013 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.
 *
 ******************************************************************************/
#include "common/bt_target.h"

#if (defined BLE_INCLUDED && BLE_INCLUDED == TRUE && GATTS_INCLUDED == TRUE)

#include "common/bt_defs.h"
#include "osi/allocator.h"
#include <string.h>
#include "gap_int.h"
#include "stack/gap_api.h"
#include "stack/gattdefs.h"
#include "stack/gatt_api.h"
#include "gatt_int.h"
#include "btm_int.h"
#include "stack/hcimsgs.h"
#include "stack/sdpdefs.h"

#define GAP_CHAR_ICON_SIZE          2
#define GAP_CHAR_DEV_NAME_SIZE      248
#define GAP_MAX_NUM_INC_SVR       0
#define GAP_MAX_ATTR_NUM          (2 * GAP_MAX_CHAR_NUM + GAP_MAX_NUM_INC_SVR + 1)
#define GAP_MAX_CHAR_VALUE_SIZE   (30 + GAP_CHAR_DEV_NAME_SIZE)


#ifndef GAP_ATTR_DB_SIZE
#define GAP_ATTR_DB_SIZE      GATT_DB_MEM_SIZE(GAP_MAX_NUM_INC_SVR, GAP_MAX_CHAR_NUM, GAP_MAX_CHAR_VALUE_SIZE)
#endif

static void gap_ble_s_attr_request_cback (UINT16 conn_id, UINT32 trans_id, tGATTS_REQ_TYPE op_code, tGATTS_DATA *p_data);

/* client connection callback */
static void  gap_ble_c_connect_cback (tGATT_IF gatt_if, BD_ADDR bda, UINT16 conn_id, BOOLEAN connected,
                                      tGATT_DISCONN_REASON reason, tGATT_TRANSPORT transport);
static void  gap_ble_c_cmpl_cback (UINT16 conn_id, tGATTC_OPTYPE op, tGATT_STATUS status, tGATT_CL_COMPLETE *p_data);

static const tGATT_CBACK gap_cback = {
    gap_ble_c_connect_cback,
    gap_ble_c_cmpl_cback,
    NULL,
    NULL,
    gap_ble_s_attr_request_cback,
    NULL,
    NULL
};



/*******************************************************************************
**
** Function         gap_find_clcb_by_bd_addr
**
** Description      The function searches all LCB with macthing bd address
**
** Returns          total number of clcb found.
**
*******************************************************************************/
tGAP_CLCB *gap_find_clcb_by_bd_addr(BD_ADDR bda)
{
    UINT8 i_clcb;
    tGAP_CLCB    *p_clcb = NULL;

    for (i_clcb = 0, p_clcb = gap_cb.clcb; i_clcb < GAP_MAX_CL; i_clcb++, p_clcb++) {
        if (p_clcb->in_use && !memcmp(p_clcb->bda, bda, BD_ADDR_LEN)) {
            return p_clcb;
        }
    }

    return NULL;
}

/*******************************************************************************
**
** Function         gap_ble_find_clcb_by_conn_id
**
** Description      The function searches all LCB with macthing connection ID
**
** Returns          total number of clcb found.
**
*******************************************************************************/
tGAP_CLCB *gap_ble_find_clcb_by_conn_id(UINT16 conn_id)
{
    UINT8 i_clcb;
    tGAP_CLCB    *p_clcb = NULL;

    for (i_clcb = 0, p_clcb = gap_cb.clcb; i_clcb < GAP_MAX_CL; i_clcb++, p_clcb++) {
        if (p_clcb->in_use && p_clcb->connected && p_clcb->conn_id == conn_id) {
            return p_clcb;
        }
    }

    return p_clcb;
}

/*******************************************************************************
**
** Function         gap_clcb_alloc
**
** Description      The function allocates a GAP  connection link control block
**
** Returns           NULL if not found. Otherwise pointer to the connection link block.
**
*******************************************************************************/
tGAP_CLCB *gap_clcb_alloc (BD_ADDR bda)
{
    UINT8         i_clcb = 0;
    tGAP_CLCB    *p_clcb = NULL;

    for (i_clcb = 0, p_clcb = gap_cb.clcb; i_clcb < GAP_MAX_CL; i_clcb++, p_clcb++) {
        if (!p_clcb->in_use) {
            memset(p_clcb, 0, sizeof(tGAP_CLCB));
            p_clcb->in_use = TRUE;
            memcpy (p_clcb->bda, bda, BD_ADDR_LEN);
            break;
        }
    }
    return p_clcb;
}

/*******************************************************************************
**
** Function         gap_ble_dealloc_clcb
**
** Description      The function clean up the pending request queue in GAP
**
** Returns          none
**
*******************************************************************************/
void gap_ble_dealloc_clcb(tGAP_CLCB *p_clcb)
{
    tGAP_BLE_REQ    *p_q;

    while ((p_q = (tGAP_BLE_REQ *)fixed_queue_dequeue(p_clcb->pending_req_q, 0)) != NULL) {
        /* send callback to all pending requests if being removed*/
        if (p_q->p_cback != NULL) {
            (*p_q->p_cback)(FALSE, p_clcb->bda, 0, NULL);
        }

        osi_free (p_q);
    }

    memset(p_clcb, 0, sizeof(tGAP_CLCB));
}

/*******************************************************************************
**
** Function         gap_ble_enqueue_request
**
** Description      The function enqueue a GAP client request
**
** Returns           TRUE is successul; FALSE otherwise
**
*******************************************************************************/
BOOLEAN gap_ble_enqueue_request (tGAP_CLCB *p_clcb, UINT16 uuid, tGAP_BLE_CMPL_CBACK *p_cback)
{
    tGAP_BLE_REQ  *p_q = (tGAP_BLE_REQ *)osi_malloc(sizeof(tGAP_BLE_REQ));

    if (p_q != NULL) {
        p_q->p_cback = p_cback;
        p_q->uuid = uuid;
        fixed_queue_enqueue(p_clcb->pending_req_q, p_q, FIXED_QUEUE_MAX_TIMEOUT);
        return TRUE;
    }

    return FALSE;
}
/*******************************************************************************
**
** Function         gap_ble_dequeue_request
**
** Description      The function dequeue a GAP client request if any
**
** Returns           TRUE is successul; FALSE otherwise
**
*******************************************************************************/
BOOLEAN gap_ble_dequeue_request (tGAP_CLCB *p_clcb, UINT16 *p_uuid, tGAP_BLE_CMPL_CBACK **p_cback)
{
    tGAP_BLE_REQ *p_q = (tGAP_BLE_REQ *)fixed_queue_dequeue(p_clcb->pending_req_q, 0);;

    if (p_q != NULL) {
        *p_cback    = p_q->p_cback;
        *p_uuid     = p_q->uuid;
        osi_free((void *)p_q);
        return TRUE;
    }

    return FALSE;
}

/*******************************************************************************
**   GAP Attributes Database Request callback
*******************************************************************************/
tGATT_STATUS gap_read_attr_value (UINT16 handle, tGATT_VALUE *p_value, BOOLEAN is_long)
{
    tGAP_ATTR   *p_db_attr = gap_cb.gap_attr;
    UINT8       *p = p_value->value, i;
    UINT16      offset = p_value->offset;
    UINT8       *p_dev_name = NULL;

    for (i = 0; i < GAP_MAX_CHAR_NUM; i ++, p_db_attr ++) {
        if (handle == p_db_attr->handle) {
            if (p_db_attr->uuid != GATT_UUID_GAP_DEVICE_NAME &&
                    is_long == TRUE) {
                return GATT_NOT_LONG;
            }

            switch (p_db_attr->uuid) {
            case GATT_UUID_GAP_DEVICE_NAME:
                BTM_ReadLocalDeviceName((char **)&p_dev_name);
                if (strlen ((char *)p_dev_name) > GATT_MAX_ATTR_LEN) {
                    p_value->len = GATT_MAX_ATTR_LEN;
                } else {
                    p_value->len = (UINT16)strlen ((char *)p_dev_name);
                }

                if (offset > p_value->len) {
                    return GATT_INVALID_OFFSET;
                } else {
                    p_value->len -= offset;
                    p_dev_name += offset;
                    ARRAY_TO_STREAM(p, p_dev_name, p_value->len);
                    GAP_TRACE_EVENT("GATT_UUID_GAP_DEVICE_NAME len=0x%04x", p_value->len);
                }
                break;

            case GATT_UUID_GAP_ICON:
                UINT16_TO_STREAM(p, p_db_attr->attr_value.icon);
                p_value->len = 2;
                break;

            case GATT_UUID_GAP_PREF_CONN_PARAM:
                UINT16_TO_STREAM(p, p_db_attr->attr_value.conn_param.int_min); /* int_min */
                UINT16_TO_STREAM(p, p_db_attr->attr_value.conn_param.int_max); /* int_max */
                UINT16_TO_STREAM(p, p_db_attr->attr_value.conn_param.latency); /* latency */
                UINT16_TO_STREAM(p, p_db_attr->attr_value.conn_param.sp_tout);  /* sp_tout */
                p_value->len = 8;
                break;

            /* address resolution */
            case GATT_UUID_GAP_CENTRAL_ADDR_RESOL:
                UINT8_TO_STREAM(p, p_db_attr->attr_value.addr_resolution);
                p_value->len = 1;
                break;
            }
            return GATT_SUCCESS;
        }
    }
    return GATT_NOT_FOUND;
}

/*******************************************************************************
**   GAP Attributes Database Read/Read Blob Request process
*******************************************************************************/
tGATT_STATUS gap_proc_read (tGATTS_REQ_TYPE type, tGATT_READ_REQ *p_data, tGATTS_RSP *p_rsp)
{
    tGATT_STATUS    status = GATT_NO_RESOURCES;
    UNUSED(type);

    if (p_data->is_long) {
        p_rsp->attr_value.offset = p_data->offset;
    }

    p_rsp->attr_value.handle = p_data->handle;

    status = gap_read_attr_value(p_data->handle, &p_rsp->attr_value, p_data->is_long);

    return status;
}

/******************************************************************************
**
** Function         gap_proc_write_req
**
** Description      GAP ATT server process a write request.
**
** Returns          void.
**
*******************************************************************************/
UINT8 gap_proc_write_req( tGATTS_REQ_TYPE type, tGATT_WRITE_REQ *p_data)
{
    tGAP_ATTR   *p_db_attr = gap_cb.gap_attr;
    UINT8   i;
    UNUSED(type);

    for (i = 0; i < GAP_MAX_CHAR_NUM; i ++, p_db_attr ++) {
        if (p_data-> handle == p_db_attr->handle) {
            return GATT_WRITE_NOT_PERMIT;
        }
    }
    return GATT_NOT_FOUND;

}

/******************************************************************************
**
** Function         gap_ble_s_attr_request_cback
**
** Description      GAP ATT server attribute access request callback.
**
** Returns          void.
**
*******************************************************************************/
void gap_ble_s_attr_request_cback (UINT16 conn_id, UINT32 trans_id,
                                   tGATTS_REQ_TYPE type, tGATTS_DATA *p_data)
{
    UINT8       status = GATT_INVALID_PDU;
    tGATTS_RSP  rsp_msg;
    BOOLEAN     ignore = FALSE;

    GAP_TRACE_EVENT("gap_ble_s_attr_request_cback : recv type (0x%02x)", type);

    memset(&rsp_msg, 0, sizeof(tGATTS_RSP));

    switch (type) {
    case GATTS_REQ_TYPE_READ:
        status = gap_proc_read(type, &p_data->read_req, &rsp_msg);
        break;

    case GATTS_REQ_TYPE_WRITE:
        if (!p_data->write_req.need_rsp) {
            ignore = TRUE;
        }

        status = gap_proc_write_req(type, &p_data->write_req);
        break;

    case GATTS_REQ_TYPE_WRITE_EXEC:
        ignore = TRUE;
        GAP_TRACE_EVENT("Ignore GATTS_REQ_TYPE_WRITE_EXEC"  );
        break;

    case GATTS_REQ_TYPE_MTU:
        GAP_TRACE_EVENT("Get MTU exchange new mtu size: %d", p_data->mtu);
        ignore = TRUE;
        break;

    default:
        GAP_TRACE_EVENT("Unknown/unexpected LE GAP ATT request: 0x%02x", type);
        break;
    }

    if (!ignore) {
        GATTS_SendRsp (conn_id, trans_id, status, &rsp_msg);
    }
}

/*******************************************************************************
**
** Function         btm_ble_att_db_init
**
** Description      GAP ATT database initalization.
**
** Returns          void.
**
*******************************************************************************/
void gap_attr_db_init(void)
{
    tBT_UUID        app_uuid = {LEN_UUID_128, {0}};
    tBT_UUID        uuid     = {LEN_UUID_16, {UUID_SERVCLASS_GAP_SERVER}};
    UINT16          service_handle;
    tGAP_ATTR       *p_db_attr = &gap_cb.gap_attr[0];
    tGATT_STATUS    status;

    /* Fill our internal UUID with a fixed pattern 0x82 */
    memset (&app_uuid.uu.uuid128, 0x82, LEN_UUID_128);
    memset(gap_cb.gap_attr, 0, sizeof(tGAP_ATTR) *GAP_MAX_CHAR_NUM);

    gap_cb.gatt_if = GATT_Register(&app_uuid, &gap_cback);

    GATT_StartIf(gap_cb.gatt_if);

    /* Create a GAP service */
    service_handle = GATTS_CreateService (gap_cb.gatt_if, &uuid, 0, GAP_MAX_ATTR_NUM, TRUE);

    GAP_TRACE_EVENT ("gap_attr_db_init service_handle = %d", service_handle);

    /* add Device Name Characteristic
    */
    uuid.len = LEN_UUID_16;
    uuid.uu.uuid16 = p_db_attr->uuid = GATT_UUID_GAP_DEVICE_NAME;
    p_db_attr->handle = GATTS_AddCharacteristic(service_handle, &uuid, GATT_PERM_READ, GATT_CHAR_PROP_BIT_READ,
											NULL, NULL);
    p_db_attr ++;

    /* add Icon characteristic
    */
    uuid.uu.uuid16   = p_db_attr->uuid = GATT_UUID_GAP_ICON;
    p_db_attr->handle = GATTS_AddCharacteristic(service_handle,
                        &uuid,
                        GATT_PERM_READ,
                        GATT_CHAR_PROP_BIT_READ,
                        NULL, NULL);
    p_db_attr ++;

#if ((defined BTM_PERIPHERAL_ENABLED) && (BTM_PERIPHERAL_ENABLED == TRUE))
    /* Only needed for peripheral testing */
    /* add preferred connection parameter characteristic
    */
    uuid.uu.uuid16 = p_db_attr->uuid = GATT_UUID_GAP_PREF_CONN_PARAM;
    p_db_attr->attr_value.conn_param.int_max = GAP_PREFER_CONN_INT_MAX; /* 6 */
    p_db_attr->attr_value.conn_param.int_min = GAP_PREFER_CONN_INT_MIN; /* 0 */
    p_db_attr->attr_value.conn_param.latency = GAP_PREFER_CONN_LATENCY; /* 0 */
    p_db_attr->attr_value.conn_param.sp_tout = GAP_PREFER_CONN_SP_TOUT; /* 2000 */
    p_db_attr->handle = GATTS_AddCharacteristic(service_handle,
                        &uuid,
                        GATT_PERM_READ,
                        GATT_CHAR_PROP_BIT_READ,
                        NULL, NULL);
    p_db_attr ++;
#endif

    /* add Central address resolution Characteristic */
    uuid.len = LEN_UUID_16;
    uuid.uu.uuid16 = p_db_attr->uuid = GATT_UUID_GAP_CENTRAL_ADDR_RESOL;
    p_db_attr->handle = GATTS_AddCharacteristic(service_handle, &uuid,
                        GATT_PERM_READ, GATT_CHAR_PROP_BIT_READ,
                        NULL, NULL);
    p_db_attr->attr_value.addr_resolution = 0;
    p_db_attr++;

    /* start service now */
    memset (&app_uuid.uu.uuid128, 0x81, LEN_UUID_128);

    status = GATTS_StartService(gap_cb.gatt_if, service_handle, GAP_TRANSPORT_SUPPORTED );
#if (CONFIG_BT_STACK_NO_LOG)
    (void) status;
#endif

    GAP_TRACE_EVENT ("GAP App gatt_if: %d  s_hdl = %d start_status=%d",
                     gap_cb.gatt_if, service_handle, status);



}

/*******************************************************************************
**
** Function         GAP_BleAttrDBUpdate
**
** Description      GAP ATT database update.
**
** Returns          void.
**
*******************************************************************************/
void GAP_BleAttrDBUpdate(UINT16 attr_uuid, tGAP_BLE_ATTR_VALUE *p_value)
{
    tGAP_ATTR  *p_db_attr = gap_cb.gap_attr;
    UINT8       i = 0;

    GAP_TRACE_EVENT("GAP_BleAttrDBUpdate attr_uuid=0x%04x\n", attr_uuid);

    for (i = 0; i < GAP_MAX_CHAR_NUM; i ++, p_db_attr ++) {
        if (p_db_attr->uuid == attr_uuid) {
            GAP_TRACE_EVENT("Found attr_uuid=0x%04x\n", attr_uuid);

            switch (attr_uuid) {
            case GATT_UUID_GAP_ICON:
                p_db_attr->attr_value.icon  =  p_value->icon;
                break;

            case GATT_UUID_GAP_PREF_CONN_PARAM:
                memcpy((void *)&p_db_attr->attr_value.conn_param,
                       (const void *)&p_value->conn_param, sizeof(tGAP_BLE_PREF_PARAM));
                break;

            case GATT_UUID_GAP_DEVICE_NAME:
                BTM_SetLocalDeviceName((char *)p_value->p_dev_name);
                break;

            case GATT_UUID_GAP_CENTRAL_ADDR_RESOL:
                p_db_attr->attr_value.addr_resolution = p_value->addr_resolution;
                break;

            }
            break;
        }
    }

    return;
}

/*******************************************************************************
**
** Function         gap_ble_send_cl_read_request
**
** Description      utility function to send a read request for a GAP charactersitic
**
** Returns          TRUE if read started, else FALSE if GAP is busy
**
*******************************************************************************/
BOOLEAN gap_ble_send_cl_read_request(tGAP_CLCB *p_clcb)
{
    tGATT_READ_PARAM        param;
    UINT16                  uuid = 0;
    BOOLEAN                 started = FALSE;

    if (gap_ble_dequeue_request(p_clcb, &uuid, &p_clcb->p_cback)) {
        memset(&param, 0, sizeof(tGATT_READ_PARAM));

        param.service.uuid.len       = LEN_UUID_16;
        param.service.uuid.uu.uuid16 = uuid;
        param.service.s_handle       = 1;
        param.service.e_handle       = 0xFFFF;
        param.service.auth_req       = 0;
#if (GATTC_INCLUDED == TRUE)
        if (GATTC_Read(p_clcb->conn_id, GATT_READ_BY_TYPE, &param) == GATT_SUCCESS) {
            p_clcb->cl_op_uuid = uuid;
            started = TRUE;
        }
#endif  ///GATTC_INCLUDED == TRUE
    }

    return started;
}

/*******************************************************************************
**
** Function         gap_ble_cl_op_cmpl
**
** Description      GAP client operation complete callback
**
** Returns          void
**
*******************************************************************************/
void gap_ble_cl_op_cmpl(tGAP_CLCB *p_clcb, BOOLEAN status, UINT16 len, UINT8 *p_name)
{
    tGAP_BLE_CMPL_CBACK *p_cback = p_clcb->p_cback;
    UINT16                  op = p_clcb->cl_op_uuid;

    GAP_TRACE_EVENT("gap_ble_cl_op_cmpl status: %d", status);

    p_clcb->cl_op_uuid = 0;
    p_clcb->p_cback = NULL;

    if (p_cback && op) {
        GAP_TRACE_EVENT("calling gap_ble_cl_op_cmpl");
        (* p_cback)(status, p_clcb->bda, len, (char *)p_name);
    }

    /* if no further activity is requested in callback, drop the link */
    if (p_clcb->connected) {
        if (!gap_ble_send_cl_read_request(p_clcb)) {
            GATT_Disconnect(p_clcb->conn_id);
            gap_ble_dealloc_clcb(p_clcb);
        }
    }
}

/*******************************************************************************
**
** Function         gap_ble_c_connect_cback
**
** Description      Client connection callback.
**
** Returns          void
**
*******************************************************************************/
static void gap_ble_c_connect_cback (tGATT_IF gatt_if, BD_ADDR bda, UINT16 conn_id,
                                     BOOLEAN connected, tGATT_DISCONN_REASON reason,
                                     tGATT_TRANSPORT transport)
{
    tGAP_CLCB   *p_clcb = gap_find_clcb_by_bd_addr (bda);

    UNUSED(gatt_if);
    UNUSED(transport);

    if (p_clcb != NULL) {
        if (connected) {
            p_clcb->conn_id = conn_id;
            p_clcb->connected = TRUE;
            /* start operation is pending */
            gap_ble_send_cl_read_request(p_clcb);
        } else {
            p_clcb->connected = FALSE;
            gap_ble_cl_op_cmpl(p_clcb, FALSE, 0, NULL);
            /* clean up clcb */
            gap_ble_dealloc_clcb(p_clcb);
        }
    }
}

/*******************************************************************************
**
** Function         gap_ble_c_cmpl_cback
**
** Description      Client operation complete callback.
**
** Returns          void
**
*******************************************************************************/
static void gap_ble_c_cmpl_cback (UINT16 conn_id, tGATTC_OPTYPE op, tGATT_STATUS status, tGATT_CL_COMPLETE *p_data)

{
    tGAP_CLCB   *p_clcb = gap_ble_find_clcb_by_conn_id(conn_id);
    UINT16      op_type;
    UINT16      min, max, latency, tout;
    UINT16      len;
    UINT8       *pp;

    if (p_clcb == NULL) {
        return;
    }

    op_type = p_clcb->cl_op_uuid;

    GAP_TRACE_EVENT ("gap_ble_c_cmpl_cback() - op_code: 0x%02x  status: 0x%02x  read_type: 0x%04x\n", op, status, op_type);
    /* Currently we only issue read commands */
    if (op != GATTC_OPTYPE_READ) {
        return;
    }

    if (status != GATT_SUCCESS) {
        gap_ble_cl_op_cmpl(p_clcb, FALSE, 0, NULL);
        return;
    }

    pp = p_data->att_value.value;

    switch (op_type) {
    case GATT_UUID_GAP_PREF_CONN_PARAM:
        GAP_TRACE_EVENT ("GATT_UUID_GAP_PREF_CONN_PARAM");
        /* Extract the peripheral preferred connection parameters and save them */

        STREAM_TO_UINT16 (min, pp);
        STREAM_TO_UINT16 (max, pp);
        STREAM_TO_UINT16 (latency, pp);
        STREAM_TO_UINT16 (tout, pp);

        BTM_BleSetPrefConnParams (p_clcb->bda, min, max, latency, tout);
        /* release the connection here */
        gap_ble_cl_op_cmpl(p_clcb, TRUE, 0, NULL);
        break;

    case GATT_UUID_GAP_DEVICE_NAME:
        GAP_TRACE_EVENT ("GATT_UUID_GAP_DEVICE_NAME\n");
        len = (UINT16)strlen((char *)pp);
        if (len > GAP_CHAR_DEV_NAME_SIZE) {
            len = GAP_CHAR_DEV_NAME_SIZE;
        }
        gap_ble_cl_op_cmpl(p_clcb, TRUE, len, pp);
        break;

    case GATT_UUID_GAP_CENTRAL_ADDR_RESOL:
        gap_ble_cl_op_cmpl(p_clcb, TRUE, 1, pp);
        break;
    }
}


/*******************************************************************************
**
** Function         gap_ble_accept_cl_operation
**
** Description      Start a process to read peer address resolution capability
**
** Returns          TRUE if request accepted
**
*******************************************************************************/
BOOLEAN gap_ble_accept_cl_operation(BD_ADDR peer_bda, UINT16 uuid, tGAP_BLE_CMPL_CBACK *p_cback)
{
    tGAP_CLCB *p_clcb;
    BOOLEAN started = FALSE;

    if (p_cback == NULL && uuid != GATT_UUID_GAP_PREF_CONN_PARAM) {
        return (started);
    }

    if ((p_clcb = gap_find_clcb_by_bd_addr (peer_bda)) == NULL) {
        if ((p_clcb = gap_clcb_alloc(peer_bda)) == NULL) {
            GAP_TRACE_ERROR("gap_ble_accept_cl_operation max connection reached");
            return started;
        }
    }

    GAP_TRACE_EVENT ("%s() - BDA: %08x%04x  cl_op_uuid: 0x%04x",
                     __FUNCTION__,
                     (peer_bda[0] << 24) + (peer_bda[1] << 16) + (peer_bda[2] << 8) + peer_bda[3],
                     (peer_bda[4] << 8) + peer_bda[5], uuid);

    if (GATT_GetConnIdIfConnected(gap_cb.gatt_if, peer_bda, &p_clcb->conn_id, BT_TRANSPORT_LE)) {
        p_clcb->connected = TRUE;
    }

    /* hold the link here */
    if (!GATT_Connect(gap_cb.gatt_if, p_clcb->bda, BLE_ADDR_UNKNOWN_TYPE, TRUE, BT_TRANSPORT_LE)) {
        return started;
    }

    /* enqueue the request */
    gap_ble_enqueue_request(p_clcb, uuid, p_cback);

    if (p_clcb->connected && p_clcb->cl_op_uuid == 0) {
        started = gap_ble_send_cl_read_request(p_clcb);
    } else { /* wait for connection up or pending operation to finish */
        started = TRUE;
    }

    return started;
}
/*******************************************************************************
**
** Function         GAP_BleReadPeerPrefConnParams
**
** Description      Start a process to read a connected peripheral's preferred
**                  connection parameters
**
** Returns          TRUE if read started, else FALSE if GAP is busy
**
*******************************************************************************/
BOOLEAN GAP_BleReadPeerPrefConnParams (BD_ADDR peer_bda)
{
    return gap_ble_accept_cl_operation (peer_bda, GATT_UUID_GAP_PREF_CONN_PARAM, NULL);
}

/*******************************************************************************
**
** Function         GAP_BleReadPeerDevName
**
** Description      Start a process to read a connected peripheral's device name.
**
** Returns          TRUE if request accepted
**
*******************************************************************************/
BOOLEAN GAP_BleReadPeerDevName (BD_ADDR peer_bda, tGAP_BLE_CMPL_CBACK *p_cback)
{
    return gap_ble_accept_cl_operation (peer_bda, GATT_UUID_GAP_DEVICE_NAME, p_cback);
}

/*******************************************************************************
**
** Function         GAP_BleReadPeerAddressResolutionCap
**
** Description      Start a process to read peer address resolution capability
**
** Returns          TRUE if request accepted
**
*******************************************************************************/
BOOLEAN GAP_BleReadPeerAddressResolutionCap (BD_ADDR peer_bda, tGAP_BLE_CMPL_CBACK *p_cback)
{
    return gap_ble_accept_cl_operation(peer_bda, GATT_UUID_GAP_CENTRAL_ADDR_RESOL, p_cback);
}

/*******************************************************************************
**
** Function         GAP_BleCancelReadPeerDevName
**
** Description      Cancel reading a peripheral's device name.
**
** Returns          TRUE if request accepted
**
*******************************************************************************/
BOOLEAN GAP_BleCancelReadPeerDevName (BD_ADDR peer_bda)
{
    tGAP_CLCB *p_clcb = gap_find_clcb_by_bd_addr (peer_bda);

    GAP_TRACE_EVENT ("GAP_BleCancelReadPeerDevName() - BDA: %08x%04x  cl_op_uuid: 0x%04x",
                     (peer_bda[0] << 24) + (peer_bda[1] << 16) + (peer_bda[2] << 8) + peer_bda[3],
                     (peer_bda[4] << 8) + peer_bda[5], (p_clcb == NULL) ? 0 : p_clcb->cl_op_uuid);

    if (p_clcb == NULL) {
        GAP_TRACE_ERROR ("Cannot cancel current op is not get dev name");
        return FALSE;
    }

    if (!p_clcb->connected) {
        if (!GATT_CancelConnect(gap_cb.gatt_if, peer_bda, TRUE)) {
            GAP_TRACE_ERROR ("Cannot cancel where No connection id");
            return FALSE;
        }
    }

    gap_ble_cl_op_cmpl(p_clcb, FALSE, 0, NULL);

    return (TRUE);
}

#endif  /* BLE_INCLUDED == TRUE && GATTS_INCLUDED == TRUE*/