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void btc_gatts_call_handler(btc_msg_t *msg)
{
    btc_ble_gatts_args_t *arg = (btc_ble_gatts_args_t *)msg->arg;

    switch (msg->act) {
    case BTC_GATTS_ACT_APP_REGISTER: {
        tBT_UUID uuid;

        uuid.len = LEN_UUID_16;
        uuid.uu.uuid16 = arg->app_reg.app_id;

        BTA_GATTS_AppRegister(&uuid, btc_gatts_inter_cb);

        break;
    }
    case BTC_GATTS_ACT_APP_UNREGISTER:
        BTA_GATTS_AppDeregister(arg->app_unreg.gatts_if);
        break;
    case BTC_GATTS_ACT_CREATE_SERVICE: {
        tBTA_GATT_SRVC_ID srvc_id;
        btc_to_bta_srvc_id(&srvc_id, &arg->create_srvc.service_id);
        BTA_GATTS_CreateService(arg->create_srvc.gatts_if, &srvc_id.id.uuid,
                                srvc_id.id.inst_id, arg->create_srvc.num_handle,
                                srvc_id.is_primary);
        break;
    }
   case BTC_GATTS_ACT_CREATE_ATTR_TAB:
    btc_gatts_act_create_attr_tab(arg->create_attr_tab.gatts_attr_db,
                                         arg->create_attr_tab.gatts_if,
                                         arg->create_attr_tab.max_nb_attr,
                                         arg->create_attr_tab.srvc_inst_id);
    break;
    case BTC_GATTS_ACT_DELETE_SERVICE:
        BTA_GATTS_DeleteService(arg->delete_srvc.service_handle);
        break;
    case BTC_GATTS_ACT_START_SERVICE:
        BTA_GATTS_StartService(arg->start_srvc.service_handle, BTA_GATT_TRANSPORT_LE);
        break;
    case BTC_GATTS_ACT_STOP_SERVICE:
        BTA_GATTS_StopService(arg->stop_srvc.service_handle);
        break;
    case BTC_GATTS_ACT_ADD_INCLUDE_SERVICE:
        BTA_GATTS_AddIncludeService(arg->add_incl_srvc.service_handle, arg->add_incl_srvc.included_service_handle);
        break;
    case BTC_GATTS_ACT_ADD_CHAR: {
        tBT_UUID uuid;
        btc_to_bta_uuid(&uuid, &arg->add_char.char_uuid);

        BTA_GATTS_AddCharacteristic(arg->add_char.service_handle, &uuid,
                                    arg->add_char.perm, arg->add_char.property, 
                                    (tGATT_ATTR_VAL *)&arg->add_char.char_val,
                                    (tBTA_GATTS_ATTR_CONTROL *)&arg->add_char.attr_control);
        break;
    }
    case BTC_GATTS_ACT_ADD_CHAR_DESCR: {
        tBT_UUID uuid;
        btc_to_bta_uuid(&uuid, &arg->add_descr.descr_uuid);
        BTA_GATTS_AddCharDescriptor(arg->add_descr.service_handle, arg->add_descr.perm, &uuid,
                                   (tBTA_GATT_ATTR_VAL *)&arg->add_descr.descr_val, 
                                   (tBTA_GATTS_ATTR_CONTROL *)&arg->add_descr.attr_control);
        break;
    }
    case BTC_GATTS_ACT_SEND_INDICATE:
        BTA_GATTS_HandleValueIndication(arg->send_ind.conn_id, arg->send_ind.attr_handle,
                                        arg->send_ind.value_len, arg->send_ind.value, arg->send_ind.need_confirm);
        break;
    case BTC_GATTS_ACT_SEND_RESPONSE: {
        esp_ble_gatts_cb_param_t param;
        esp_gatt_rsp_t *p_rsp = arg->send_rsp.rsp;

        if (p_rsp) {
            tBTA_GATTS_RSP rsp_struct;
            btc_to_bta_response(&rsp_struct, p_rsp);
            BTA_GATTS_SendRsp(arg->send_rsp.conn_id, arg->send_rsp.trans_id,
                              arg->send_rsp.status, &rsp_struct);
            param.rsp.handle = rsp_struct.attr_value.handle;
        } else {
            BTA_GATTS_SendRsp(arg->send_rsp.conn_id, arg->send_rsp.trans_id,
                              arg->send_rsp.status, NULL);
        }

        param.rsp.status = 0;
        btc_gatts_cb_to_app(ESP_GATTS_RESPONSE_EVT, BTC_GATT_GET_GATT_IF(arg->send_rsp.conn_id), &param);
        break;
    }
  case BTC_GATTS_ACT_SET_ATTR_VALUE:
    
    break;
    case BTC_GATTS_ACT_OPEN: {
        // Ensure device is in inquiry database
        tBTA_GATT_TRANSPORT transport = BTA_GATT_TRANSPORT_LE;

        //TODO : implement address type and device type
#if  0
        if (_get_address_type(arg->remote_bda, &addr_type) &&
                btif_get_device_type(arg->remote_bda, &device_type) &&
                device_type != BT_DEVICE_TYPE_BREDR) {
            BTA_DmAddBleDevice(p_cb->bd_addr.address, addr_type, device_type);
        }
#else
        //BTA_DmAddBleDevice(p_cb->bd_addr.address, addr_type, device_type);
#endif
        // Mark background connections
        if (!arg->open.is_direct) {
            BTA_DmBleSetBgConnType(BTM_BLE_CONN_AUTO, NULL);
        }

        transport = BTA_GATT_TRANSPORT_LE;

        // Connect!
        BTA_GATTS_Open(arg->open.gatts_if, arg->open.remote_bda,
                       arg->open.is_direct, transport);
        break;
    }
    case BTC_GATTS_ACT_CLOSE:
        // TODO : implement cancel open
        // Cancel pending foreground/background connections
        //BTA_GATTS_CancelOpen(p_cb->server_if, p_cb->bd_addr.address, TRUE);
        //BTA_GATTS_CancelOpen(p_cb->server_if, p_cb->bd_addr.address, FALSE);

        // Close active connection
        if (arg->close.conn_id != 0) {
            BTA_GATTS_Close(arg->close.conn_id);
        }

        break;
    default:
        break;
    }
    btc_gatts_arg_deep_free(msg);
}