bta/gatt/bta_gatts_act.cc

/******************************************************************************
 *
 *  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 Server action functions for the state
 *  machine.
 *
 ******************************************************************************/

#include "bt_target.h"

#include <string.h>
#include "bt_common.h"
#include "bta_gatts_co.h"
#include "bta_gatts_int.h"
#include "bta_sys.h"
#include "btif/include/btif_debug_conn.h"
#include "btm_ble_api.h"
#include "osi/include/osi.h"
#include "utl.h"

static void bta_gatts_nv_save_cback(bool is_saved,
                                    tGATTS_HNDL_RANGE* p_hndl_range);
static bool bta_gatts_nv_srv_chg_cback(tGATTS_SRV_CHG_CMD cmd,
                                       tGATTS_SRV_CHG_REQ* p_req,
                                       tGATTS_SRV_CHG_RSP* p_rsp);

static void bta_gatts_conn_cback(tGATT_IF gatt_if, BD_ADDR bda,
                                 uint16_t conn_id, bool connected,
                                 tGATT_DISCONN_REASON reason,
                                 tGATT_TRANSPORT transport);
static void bta_gatts_send_request_cback(uint16_t conn_id, uint32_t trans_id,
                                         tGATTS_REQ_TYPE req_type,
                                         tGATTS_DATA* p_data);
static void bta_gatts_cong_cback(uint16_t conn_id, bool congested);

static tGATT_CBACK bta_gatts_cback = {
    bta_gatts_conn_cback, NULL, NULL, NULL, bta_gatts_send_request_cback, NULL,
    bta_gatts_cong_cback};

tGATT_APPL_INFO bta_gatts_nv_cback = {bta_gatts_nv_save_cback,
                                      bta_gatts_nv_srv_chg_cback};

/*******************************************************************************
 *
 * Function         bta_gatts_nv_save_cback
 *
 * Description      NV save callback function.
 *
 * Parameter        is_add: true is to add a handle range; otherwise is to
 *                          delete.
 * Returns          none.
 *
 ******************************************************************************/
static void bta_gatts_nv_save_cback(bool is_add,
                                    tGATTS_HNDL_RANGE* p_hndl_range) {
  bta_gatts_co_update_handle_range(is_add,
                                   (tBTA_GATTS_HNDL_RANGE*)p_hndl_range);
}

/*******************************************************************************
 *
 * Function         bta_gatts_nv_srv_chg_cback
 *
 * Description      NV save callback function.
 *
 * Parameter        is_add: true is to add a handle range; otherwise is to
 *                          delete.
 * Returns          none.
 *
 ******************************************************************************/
static bool bta_gatts_nv_srv_chg_cback(tGATTS_SRV_CHG_CMD cmd,
                                       tGATTS_SRV_CHG_REQ* p_req,
                                       tGATTS_SRV_CHG_RSP* p_rsp) {
  return bta_gatts_co_srv_chg((tBTA_GATTS_SRV_CHG_CMD)cmd,
                              (tBTA_GATTS_SRV_CHG_REQ*)p_req,
                              (tBTA_GATTS_SRV_CHG_RSP*)p_rsp);
}

/*******************************************************************************
 *
 * Function         bta_gatts_enable
 *
 * Description      enable BTA GATTS module.
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_enable(tBTA_GATTS_CB* p_cb) {
  uint8_t index = 0;
  tBTA_GATTS_HNDL_RANGE handle_range;

  if (p_cb->enabled) {
    APPL_TRACE_DEBUG("GATTS already enabled.");
  } else {
    memset(p_cb, 0, sizeof(tBTA_GATTS_CB));

    p_cb->enabled = true;

    while (bta_gatts_co_load_handle_range(index, &handle_range)) {
      GATTS_AddHandleRange((tGATTS_HNDL_RANGE*)&handle_range);
      memset(&handle_range, 0, sizeof(tGATTS_HNDL_RANGE));
      index++;
    }

    APPL_TRACE_DEBUG("bta_gatts_enable: num of handle range added=%d", index);

    if (!GATTS_NVRegister(&bta_gatts_nv_cback)) {
      APPL_TRACE_ERROR("BTA GATTS NV register failed.");
    }
  }
}

/*******************************************************************************
 *
 * Function         bta_gatts_api_disable
 *
 * Description      disable BTA GATTS module.
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_api_disable(tBTA_GATTS_CB* p_cb) {
  uint8_t i;

  if (p_cb->enabled) {
    for (i = 0; i < BTA_GATTS_MAX_APP_NUM; i++) {
      if (p_cb->rcb[i].in_use) {
        GATT_Deregister(p_cb->rcb[i].gatt_if);
      }
    }
    memset(p_cb, 0, sizeof(tBTA_GATTS_CB));
  } else {
    APPL_TRACE_ERROR("GATTS not enabled");
  }
}

/*******************************************************************************
 *
 * Function         bta_gatts_register
 *
 * Description      register an application.
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_register(tBTA_GATTS_CB* p_cb, tBTA_GATTS_DATA* p_msg) {
  tBTA_GATTS cb_data;
  tBTA_GATT_STATUS status = BTA_GATT_OK;
  uint8_t i, first_unuse = 0xff;

  if (p_cb->enabled == false) {
    bta_gatts_enable(p_cb);
  }

  for (i = 0; i < BTA_GATTS_MAX_APP_NUM; i++) {
    if (p_cb->rcb[i].in_use) {
      if (bta_gatts_uuid_compare(p_cb->rcb[i].app_uuid,
                                 p_msg->api_reg.app_uuid)) {
        APPL_TRACE_ERROR("application already registered.");
        status = BTA_GATT_DUP_REG;
        break;
      }
    }
  }

  if (status == BTA_GATT_OK) {
    for (i = 0; i < BTA_GATTS_MAX_APP_NUM; i++) {
      if (first_unuse == 0xff && !p_cb->rcb[i].in_use) {
        first_unuse = i;
        break;
      }
    }

    cb_data.reg_oper.server_if = BTA_GATTS_INVALID_IF;
    memcpy(&cb_data.reg_oper.uuid, &p_msg->api_reg.app_uuid, sizeof(tBT_UUID));
    if (first_unuse != 0xff) {
      APPL_TRACE_ERROR("register application first_unuse rcb_idx = %d",
                       first_unuse);

      p_cb->rcb[first_unuse].in_use = true;
      p_cb->rcb[first_unuse].p_cback = p_msg->api_reg.p_cback;
      memcpy(&p_cb->rcb[first_unuse].app_uuid, &p_msg->api_reg.app_uuid,
             sizeof(tBT_UUID));
      cb_data.reg_oper.server_if = p_cb->rcb[first_unuse].gatt_if =
          GATT_Register(&p_msg->api_reg.app_uuid, &bta_gatts_cback);
      if (!p_cb->rcb[first_unuse].gatt_if) {
        status = BTA_GATT_NO_RESOURCES;
      } else {
        tBTA_GATTS_INT_START_IF* p_buf = (tBTA_GATTS_INT_START_IF*)osi_malloc(
            sizeof(tBTA_GATTS_INT_START_IF));
        p_buf->hdr.event = BTA_GATTS_INT_START_IF_EVT;
        p_buf->server_if = p_cb->rcb[first_unuse].gatt_if;

        bta_sys_sendmsg(p_buf);
      }
    } else {
      status = BTA_GATT_NO_RESOURCES;
    }
  }
  cb_data.reg_oper.status = status;
  if (p_msg->api_reg.p_cback)
    (*p_msg->api_reg.p_cback)(BTA_GATTS_REG_EVT, &cb_data);
}

/*******************************************************************************
 *
 * Function         bta_gatts_start_if
 *
 * Description      start an application interface.
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_start_if(UNUSED_ATTR tBTA_GATTS_CB* p_cb,
                        tBTA_GATTS_DATA* p_msg) {
  if (bta_gatts_find_app_rcb_by_app_if(p_msg->int_start_if.server_if)) {
    GATT_StartIf(p_msg->int_start_if.server_if);
  } else {
    APPL_TRACE_ERROR("Unable to start app.: Unknown interface =%d",
                     p_msg->int_start_if.server_if);
  }
}
/*******************************************************************************
 *
 * Function         bta_gatts_deregister
 *
 * Description      deregister an application.
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_deregister(tBTA_GATTS_CB* p_cb, tBTA_GATTS_DATA* p_msg) {
  tBTA_GATT_STATUS status = BTA_GATT_ERROR;
  tBTA_GATTS_CBACK* p_cback = NULL;
  uint8_t i;
  tBTA_GATTS cb_data;

  cb_data.reg_oper.server_if = p_msg->api_dereg.server_if;
  cb_data.reg_oper.status = status;

  for (i = 0; i < BTA_GATTS_MAX_APP_NUM; i++) {
    if (p_cb->rcb[i].in_use &&
        p_cb->rcb[i].gatt_if == p_msg->api_dereg.server_if) {
      p_cback = p_cb->rcb[i].p_cback;
      status = BTA_GATT_OK;

      /* deregister the app */
      GATT_Deregister(p_cb->rcb[i].gatt_if);

      /* reset cb */
      memset(&p_cb->rcb[i], 0, sizeof(tBTA_GATTS_RCB));
      cb_data.reg_oper.status = status;
      break;
    }
  }

  if (p_cback) {
    (*p_cback)(BTA_GATTS_DEREG_EVT, &cb_data);
  } else {
    APPL_TRACE_ERROR("application not registered.");
  }
}

/*******************************************************************************
 *
 * Function         bta_gatts_delete_service
 *
 * Description      action function to delete a service.
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_delete_service(tBTA_GATTS_SRVC_CB* p_srvc_cb,
                              tBTA_GATTS_DATA* p_msg) {
  tBTA_GATTS_RCB* p_rcb = &bta_gatts_cb.rcb[p_srvc_cb->rcb_idx];
  tBTA_GATTS cb_data;

  cb_data.srvc_oper.server_if = p_rcb->gatt_if;
  // cb_data.srvc_oper.service_id = p_msg->api_add_incl_srvc.hdr.layer_specific;

  if (GATTS_DeleteService(p_rcb->gatt_if, &p_srvc_cb->service_uuid,
                          p_srvc_cb->service_id)) {
    cb_data.srvc_oper.status = BTA_GATT_OK;
    memset(p_srvc_cb, 0, sizeof(tBTA_GATTS_SRVC_CB));
  } else {
    cb_data.srvc_oper.status = BTA_GATT_ERROR;
  }

  if (p_rcb->p_cback) (*p_rcb->p_cback)(BTA_GATTS_DELELTE_EVT, &cb_data);
}

/*******************************************************************************
 *
 * Function         bta_gatts_stop_service
 *
 * Description      action function to stop a service.
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_stop_service(tBTA_GATTS_SRVC_CB* p_srvc_cb,
                            UNUSED_ATTR tBTA_GATTS_DATA* p_msg) {
  tBTA_GATTS_RCB* p_rcb = &bta_gatts_cb.rcb[p_srvc_cb->rcb_idx];
  tBTA_GATTS cb_data;

  GATTS_StopService(p_srvc_cb->service_id);
  cb_data.srvc_oper.server_if = p_rcb->gatt_if;
  cb_data.srvc_oper.service_id = p_srvc_cb->service_id;
  cb_data.srvc_oper.status = BTA_GATT_OK;
  APPL_TRACE_ERROR("bta_gatts_stop_service service_id= %d",
                   p_srvc_cb->service_id);

  if (p_rcb->p_cback) (*p_rcb->p_cback)(BTA_GATTS_STOP_EVT, &cb_data);
}
/*******************************************************************************
 *
 * Function         bta_gatts_send_rsp
 *
 * Description      GATTS send response.
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_send_rsp(UNUSED_ATTR tBTA_GATTS_CB* p_cb,
                        tBTA_GATTS_DATA* p_msg) {
  if (GATTS_SendRsp(p_msg->api_rsp.hdr.layer_specific, p_msg->api_rsp.trans_id,
                    p_msg->api_rsp.status,
                    (tGATTS_RSP*)p_msg->api_rsp.p_rsp) != GATT_SUCCESS) {
    APPL_TRACE_ERROR("Sending response failed");
  }
}
/*******************************************************************************
 *
 * Function         bta_gatts_indicate_handle
 *
 * Description      GATTS send handle value indication or notification.
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_indicate_handle(tBTA_GATTS_CB* p_cb, tBTA_GATTS_DATA* p_msg) {
  tBTA_GATTS_SRVC_CB* p_srvc_cb;
  tBTA_GATTS_RCB* p_rcb = NULL;
  tBTA_GATT_STATUS status = BTA_GATT_ILLEGAL_PARAMETER;
  tGATT_IF gatt_if;
  BD_ADDR remote_bda;
  tBTA_TRANSPORT transport;
  tBTA_GATTS cb_data;

  p_srvc_cb =
      bta_gatts_find_srvc_cb_by_attr_id(p_cb, p_msg->api_indicate.attr_id);

  if (p_srvc_cb) {
    if (GATT_GetConnectionInfor(p_msg->api_indicate.hdr.layer_specific,
                                &gatt_if, remote_bda, &transport)) {
      p_rcb = bta_gatts_find_app_rcb_by_app_if(gatt_if);

      if (p_msg->api_indicate.need_confirm)

        status = GATTS_HandleValueIndication(
            p_msg->api_indicate.hdr.layer_specific, p_msg->api_indicate.attr_id,
            p_msg->api_indicate.len, p_msg->api_indicate.value);
      else
        status = GATTS_HandleValueNotification(
            p_msg->api_indicate.hdr.layer_specific, p_msg->api_indicate.attr_id,
            p_msg->api_indicate.len, p_msg->api_indicate.value);

      /* if over BR_EDR, inform PM for mode change */
      if (transport == BTA_TRANSPORT_BR_EDR) {
        bta_sys_busy(BTA_ID_GATTS, BTA_ALL_APP_ID, remote_bda);
        bta_sys_idle(BTA_ID_GATTS, BTA_ALL_APP_ID, remote_bda);
      }
    } else {
      APPL_TRACE_ERROR("Unknown connection ID: %d fail sending notification",
                       p_msg->api_indicate.hdr.layer_specific);
    }

    if ((status != GATT_SUCCESS || !p_msg->api_indicate.need_confirm) &&
        p_rcb && p_cb->rcb[p_srvc_cb->rcb_idx].p_cback) {
      cb_data.req_data.status = status;
      cb_data.req_data.conn_id = p_msg->api_indicate.hdr.layer_specific;

      (*p_rcb->p_cback)(BTA_GATTS_CONF_EVT, &cb_data);
    }
  } else {
    APPL_TRACE_ERROR("Not an registered servce attribute ID: 0x%04x",
                     p_msg->api_indicate.attr_id);
  }
}

/*******************************************************************************
 *
 * Function         bta_gatts_open
 *
 * Description
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_open(UNUSED_ATTR tBTA_GATTS_CB* p_cb, tBTA_GATTS_DATA* p_msg) {
  tBTA_GATTS_RCB* p_rcb = NULL;
  tBTA_GATT_STATUS status = BTA_GATT_ERROR;
  uint16_t conn_id;

  p_rcb = bta_gatts_find_app_rcb_by_app_if(p_msg->api_open.server_if);
  if (p_rcb != NULL) {
    /* should always get the connection ID */
    if (GATT_Connect(p_rcb->gatt_if, p_msg->api_open.remote_bda,
                     p_msg->api_open.is_direct, p_msg->api_open.transport,
                     false)) {
      status = BTA_GATT_OK;

      if (GATT_GetConnIdIfConnected(p_rcb->gatt_if, p_msg->api_open.remote_bda,
                                    &conn_id, p_msg->api_open.transport)) {
        status = BTA_GATT_ALREADY_OPEN;
      }
    }
  } else {
    APPL_TRACE_ERROR("Inavlide server_if=%d", p_msg->api_open.server_if);
  }

  if (p_rcb && p_rcb->p_cback)
    (*p_rcb->p_cback)(BTA_GATTS_OPEN_EVT, (tBTA_GATTS*)&status);
}
/*******************************************************************************
 *
 * Function         bta_gatts_cancel_open
 *
 * Description
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_cancel_open(UNUSED_ATTR tBTA_GATTS_CB* p_cb,
                           tBTA_GATTS_DATA* p_msg) {
  tBTA_GATTS_RCB* p_rcb;
  tBTA_GATT_STATUS status = BTA_GATT_ERROR;

  p_rcb = bta_gatts_find_app_rcb_by_app_if(p_msg->api_cancel_open.server_if);
  if (p_rcb != NULL) {
    if (!GATT_CancelConnect(p_rcb->gatt_if, p_msg->api_cancel_open.remote_bda,
                            p_msg->api_cancel_open.is_direct)) {
      APPL_TRACE_ERROR("bta_gatts_cancel_open failed for open request");
    } else {
      status = BTA_GATT_OK;
    }
  } else {
    APPL_TRACE_ERROR("Inavlide server_if=%d", p_msg->api_cancel_open.server_if);
  }

  if (p_rcb && p_rcb->p_cback)
    (*p_rcb->p_cback)(BTA_GATTS_CANCEL_OPEN_EVT, (tBTA_GATTS*)&status);
}
/*******************************************************************************
 *
 * Function         bta_gatts_close
 *
 * Description
 *
 * Returns          none.
 *
 ******************************************************************************/
void bta_gatts_close(UNUSED_ATTR tBTA_GATTS_CB* p_cb, tBTA_GATTS_DATA* p_msg) {
  tBTA_GATTS_RCB* p_rcb;
  tBTA_GATT_STATUS status = BTA_GATT_ERROR;
  tGATT_IF gatt_if;
  BD_ADDR remote_bda;
  tBTA_GATT_TRANSPORT transport;

  if (GATT_GetConnectionInfor(p_msg->hdr.layer_specific, &gatt_if, remote_bda,
                              &transport)) {
    if (GATT_Disconnect(p_msg->hdr.layer_specific) != GATT_SUCCESS) {
      APPL_TRACE_ERROR("bta_gatts_close fail conn_id=%d",
                       p_msg->hdr.layer_specific);
    } else {
      status = BTA_GATT_OK;
    }

    p_rcb = bta_gatts_find_app_rcb_by_app_if(gatt_if);

    if (p_rcb && p_rcb->p_cback) {
      if (transport == BTA_TRANSPORT_BR_EDR)
        bta_sys_conn_close(BTA_ID_GATTS, BTA_ALL_APP_ID, remote_bda);

      (*p_rcb->p_cback)(BTA_GATTS_CLOSE_EVT, (tBTA_GATTS*)&status);
    }
  } else {
    APPL_TRACE_ERROR("Unknown connection ID: %d", p_msg->hdr.layer_specific);
  }
}

/*******************************************************************************
 *
 * Function         bta_gatts_request_cback
 *
 * Description      GATTS attribute request callback.
 *
 * Returns          none.
 *
 ******************************************************************************/
static void bta_gatts_send_request_cback(uint16_t conn_id, uint32_t trans_id,
                                         tGATTS_REQ_TYPE req_type,
                                         tGATTS_DATA* p_data) {
  tBTA_GATTS cb_data;
  tBTA_GATTS_RCB* p_rcb;
  tGATT_IF gatt_if;
  tBTA_GATT_TRANSPORT transport;

  memset(&cb_data, 0, sizeof(tBTA_GATTS));

  if (GATT_GetConnectionInfor(conn_id, &gatt_if, cb_data.req_data.remote_bda,
                              &transport)) {
    p_rcb = bta_gatts_find_app_rcb_by_app_if(gatt_if);

    APPL_TRACE_DEBUG("%s: conn_id=%d trans_id=%d req_type=%d", __func__,
                     conn_id, trans_id, req_type);

    if (p_rcb && p_rcb->p_cback) {
      /* if over BR_EDR, inform PM for mode change */
      if (transport == BTA_TRANSPORT_BR_EDR) {
        bta_sys_busy(BTA_ID_GATTS, BTA_ALL_APP_ID, cb_data.req_data.remote_bda);
        bta_sys_idle(BTA_ID_GATTS, BTA_ALL_APP_ID, cb_data.req_data.remote_bda);
      }

      cb_data.req_data.conn_id = conn_id;
      cb_data.req_data.trans_id = trans_id;
      cb_data.req_data.p_data = (tBTA_GATTS_REQ_DATA*)p_data;

      (*p_rcb->p_cback)(req_type, &cb_data);
    } else {
      APPL_TRACE_ERROR("connection request on gatt_if[%d] is not interested",
                       gatt_if);
    }
  } else {
    APPL_TRACE_ERROR("request received on unknown connectino ID: %d", conn_id);
  }
}

/*******************************************************************************
 *
 * Function         bta_gatts_conn_cback
 *
 * Description      connection callback.
 *
 * Returns          none.
 *
 ******************************************************************************/
static void bta_gatts_conn_cback(tGATT_IF gatt_if, BD_ADDR bda,
                                 uint16_t conn_id, bool connected,
                                 tGATT_DISCONN_REASON reason,
                                 tGATT_TRANSPORT transport) {
  tBTA_GATTS cb_data;
  uint8_t evt = connected ? BTA_GATTS_CONNECT_EVT : BTA_GATTS_DISCONNECT_EVT;
  tBTA_GATTS_RCB* p_reg;

  APPL_TRACE_DEBUG(
      "bta_gatts_conn_cback gatt_if=%d conn_id=%d connected=%d reason = 0x%04d",
      gatt_if, conn_id, connected, reason);
  APPL_TRACE_DEBUG("bta_gatts_conn_cback  bda :%02x-%02x-%02x-%02x-%02x-%02x ",
                   bda[0], bda[1], bda[2], bda[3], bda[4], bda[5]);

  bt_bdaddr_t bdaddr;
  bdcpy(bdaddr.address, bda);
  if (connected)
    btif_debug_conn_state(bdaddr, BTIF_DEBUG_CONNECTED, GATT_CONN_UNKNOWN);
  else
    btif_debug_conn_state(bdaddr, BTIF_DEBUG_DISCONNECTED, reason);

  p_reg = bta_gatts_find_app_rcb_by_app_if(gatt_if);

  if (p_reg && p_reg->p_cback) {
    /* there is no RM for GATT */
    if (transport == BTA_TRANSPORT_BR_EDR) {
      if (connected)
        bta_sys_conn_open(BTA_ID_GATTS, BTA_ALL_APP_ID, bda);
      else
        bta_sys_conn_close(BTA_ID_GATTS, BTA_ALL_APP_ID, bda);
    }

    cb_data.conn.conn_id = conn_id;
    cb_data.conn.server_if = gatt_if;
    cb_data.conn.reason = reason;
    cb_data.conn.transport = transport;
    memcpy(cb_data.conn.remote_bda, bda, BD_ADDR_LEN);
    (*p_reg->p_cback)(evt, &cb_data);
  } else {
    APPL_TRACE_ERROR("bta_gatts_conn_cback server_if=%d not found", gatt_if);
  }
}

/*******************************************************************************
 *
 * Function         bta_gatts_cong_cback
 *
 * Description      congestion callback.
 *
 * Returns          none.
 *
 ******************************************************************************/
static void bta_gatts_cong_cback(uint16_t conn_id, bool congested) {
  tBTA_GATTS_RCB* p_rcb;
  tGATT_IF gatt_if;
  tBTA_GATT_TRANSPORT transport;
  tBTA_GATTS cb_data;

  if (GATT_GetConnectionInfor(conn_id, &gatt_if, cb_data.req_data.remote_bda,
                              &transport)) {
    p_rcb = bta_gatts_find_app_rcb_by_app_if(gatt_if);

    if (p_rcb && p_rcb->p_cback) {
      cb_data.congest.conn_id = conn_id;
      cb_data.congest.congested = congested;

      (*p_rcb->p_cback)(BTA_GATTS_CONGEST_EVT, &cb_data);
    }
  }
}