gattc open issue

[Nicholas3388]

Hi,
I use PASSIVE scan type for scanning, and I can scan my BLE device's advertising. But when I try to invoke esp_ble_gattc_open to connect to the device, I got the following error:
[0;31mE (2201) BT: bta_gattc_conn_cback() - cif=3 connected=0 conn_id=3 reason=0x003e[0m
[0;31mE (2201) BT: bta_gattc_conn_cback() - cif=4 connected=0 conn_id=4 reason=0x003e[0m
[0;31mE (2201) BT: btm_sec_disconnected clearing pending flag handle:0 reason:62

According to the link: https://bugs.chromium.org/p/chromium/is ... ?id=578800, the error no. 0x3e means that Connection Failed to be Established. Is anybody faced the same issue? Can anyone tell me how to solve it?

[Nicholas3388]

P.S. esp_ble_gattc_open return 0. It seems that gatt open without problem. But when the ESP_GATTC_OPEN_EVT event occurs, the following error output:

GATTC_DEMO: ESP_GATTC_OPEN_EVT conn_id 0, if 4, status 133, mtu 0

As you can see, the status is 133, there are some errors occurs. Can anyone tell me how to solve it?

[kolban]

Howdy,
I'm not an expert on BLE but I'm trying to study hard. The first thing is to decode the error code which we find means ESP_GATT_ERROR (see https://github.com/espressif/esp-idf/bl ... efs.h#L190) which doesn't really tell us much.

So let us step back ... let us look at the call to esp_ble_gattc_open(). It takes a few parameters ... what exactly are you supplying for those parameters?

The primary parameter is a BLE device address ... how did you determine the address of the device you are connecting against? What (physically) kind of device is it? Are we sure that it is a BLE device as opposed to a Bluetooth classic device?

I would also suggest registering for GATT client events using esp_ble_gattc_register_callback() and log the events received.

[Nicholas3388]

@kolban Hi, Thanks for your advice. The target device is a nRF51822 device, which is not developed by me. I just want to connect to it and control it via ble. I can connect to the target using some BLE debug tool on Android phone, the target address will be shown by the BLE debug tool, so I can determine the device address. I'm sure the target is a BLE device not a Bluetooth classic device, because you can find out the device type when ESP_GAP_BLE_SCAN_RESULT_EVT comes, you can find out the device type via scan_result->scan_rst.dev_type

[kolban]

Howdy,
The next thing to do then will be to look at the design / implementation you have. Can you post the code or a link to the code and ideally jot down the high level design of your logic?

[Trialblazer47]

I also get same error.
[0;32mI (19382) GATTC_DEMO:
[0m
[0;32mI (19392) GATTC_DEMO: Searched Device Name Len 0[0m
[0;32mI (19402) GATTC_DEMO: Stop scan successfully[0m
[0;31mE (19742) BT: bta_gattc_conn_cback() - cif=3 connected=0 conn_id=3 reason=0x003e[0m
[0;31mE (19742) BT: bta_gattc_conn_cback() - cif=4 connected=0 conn_id=4 reason=0x003e[0m
[0;31mE (19742) BT: btm_sec_disconnected clearing pending flag handle:0 reason:62
[0m
[0;32mI (19752) GATTC_DEMO: EVT 2, gattc if 3[0m
[0;32mI (19752) GATTC_DEMO: ESP_GATTC_OPEN_EVT conn_id 0, if 3, status 133, mtu 0[0m
[0;32mI (19762) GATTC_DEMO: REMOTE BDA d4:a2:5c:6d:0c:16[0m


I upload NRF51 with a demo code to make a program for ESP32..

My nrf51 code.

Code: Select all

#include <BLE_API.h>

#define TXRX_BUF_LEN                      20

BLE                                       ble;
Ticker                                    ticker;

static uint16_t value=0;

// The Nordic UART Service
static const uint8_t service1_uuid[]                = {0x71, 0x3D, 0, 0, 0x50, 0x3E, 0x4C, 0x75, 0xBA, 0x94, 0x31, 0x48, 0xF1, 0x8D, 0x94, 0x1E};
static const uint8_t service1_chars1_uuid[]         = {0x71, 0x3D, 0, 2, 0x50, 0x3E, 0x4C, 0x75, 0xBA, 0x94, 0x31, 0x48, 0xF1, 0x8D, 0x94, 0x1E};
static const uint8_t service1_chars2_uuid[]         = {0x71, 0x3D, 0, 3, 0x50, 0x3E, 0x4C, 0x75, 0xBA, 0x94, 0x31, 0x48, 0xF1, 0x8D, 0x94, 0x1E};
static const uint8_t service1_chars3_uuid[]         = {0x71, 0x3D, 0, 4, 0x50, 0x3E, 0x4C, 0x75, 0xBA, 0x94, 0x31, 0x48, 0xF1, 0x8D, 0x94, 0x1D};  //<< different so as to pick it up in ESP32 and enable notification.
static const uint8_t uart_base_uuid_rev[]           = {0x1E, 0x94, 0x8D, 0xF1, 0x48, 0x31, 0x94, 0xBA, 0x75, 0x4C, 0x3E, 0x50, 0, 0, 0x3D, 0x71};

uint8_t chars1_value[TXRX_BUF_LEN] = {0,};
uint8_t chars2_value[TXRX_BUF_LEN] = {0,};
uint8_t chars3_value[TXRX_BUF_LEN] = {0x01, 0x02, 0x03};

char DEVICE_ALIVE_NAME[]={'B','L','E','_','D','E','M','O'}; //Alive name

GattCharacteristic  characteristic1(service1_chars1_uuid, chars1_value, 1, TXRX_BUF_LEN,GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE );

GattCharacteristic  characteristic2(service1_chars2_uuid, chars2_value, 1, TXRX_BUF_LEN, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ);

GattCharacteristic  characteristic3(service1_chars3_uuid, chars3_value, 3, TXRX_BUF_LEN, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);

GattCharacteristic *uartChars[] = {&characteristic1, &characteristic2, &characteristic3};

GattService         uartService(service1_uuid, uartChars, sizeof(uartChars) / sizeof(GattCharacteristic *));


void disconnectionCallBack(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)
{
    Serial.println("Disconnected ");
    Serial.println("Restart advertising ");
    ble.startAdvertising();
}

// GATT call back handle
void writtenHandle(const GattWriteCallbackParams *Handler)
{
    uint8_t buf[TXRX_BUF_LEN];
    uint16_t bytesRead, index;

    Serial.println("Write Handle : ");
    if (Handler->handle == characteristic1.getValueAttribute().getHandle())
    {
        ble.readCharacteristicValue(characteristic1.getValueAttribute().getHandle(), buf, &bytesRead);
        for(byte index=0; index<bytesRead; index++)
        {
            Serial.print(buf[index], HEX);
        }
        Serial.println(" ");
    }
}
void connectionCallBack(const Gap::ConnectionCallbackParams_t *params )
{
  Serial.println("Connected ");
}
// Task handle
void m_1s_handle(void)
{
    Serial.println("1s Loop ");
    value++;
    ble.updateCharacteristicValue(characteristic3.getValueAttribute().getHandle(), (uint8_t *)&value, 2);
}
void dataSent(unsigned Count)
{
 Serial.println("Sent");

  //sendData();//trigger
}

void setup() {

    ticker.attach(m_1s_handle, 1);
    // put your setup code here, to run once
    Serial.begin(9600);
    delay(12000);
    pinMode(D13, OUTPUT);

    Serial.println("Start ");
    ble.init();
    ble.onConnection(connectionCallBack);
    ble.onDisconnection(disconnectionCallBack);
    ble.onDataWritten(writtenHandle);
    ble.onDataSent(dataSent);
    // setup adv_data and srp_data
    ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME , (uint8_t *)DEVICE_ALIVE_NAME, 8 );
    ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_128BIT_SERVICE_IDS,
                                     (const uint8_t *)uart_base_uuid_rev, sizeof(uart_base_uuid_rev));

    ble.accumulateScanResponse(GapAdvertisingData::SHORTENED_LOCAL_NAME,
                              (const uint8_t *)"hello", sizeof("hello") - 1);
    ble.accumulateScanResponse(GapAdvertisingData::COMPLETE_LIST_128BIT_SERVICE_IDS,
                              (const uint8_t *)uart_base_uuid_rev, sizeof(uart_base_uuid_rev));

    // set adv_type
    ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
    // add service
    ble.addService(uartService);
    // set device name
    ble.setDeviceName((const uint8_t *)"BLE_DEMO");
    // set tx power,valid values are -40, -20, -16, -12, -8, -4, 0, 4
    ble.setTxPower(4);

    // set adv_interval, 100ms in multiples of 0.625ms.
    ble.setAdvertisingInterval(160);
    // set adv_timeout, in seconds
    ble.setAdvertisingTimeout(0);
    // ger BLE stack version
    Serial.println( ble.getVersion() );
    // start advertising
    ble.startAdvertising();

    Serial.println("start advertising ");
}

void loop() {
    ble.waitForEvent();
}

and my ESP32 code is made from demo code for Gatt_client.

Code: Select all

// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// 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 is for gatt client. It can scan ble device, connect one device,
*
****************************************************************************/

#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#include "controller.h"

#include "bt.h"
#include "bt_trace.h"
#include "bt_types.h"
#include "btm_api.h"
#include "bta_api.h"
#include "bta_gatt_api.h"
#include "esp_gap_ble_api.h"
#include "esp_gattc_api.h"
#include "esp_gatt_defs.h"
#include "esp_bt_main.h"

#define GATTC_TAG "GATTC_DEMO"

///Declare static functions
static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param);
static void esp_gattc_cb(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param);
static void gattc_profile_a_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param);
static void gattc_profile_b_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param);


static esp_gatt_srvc_id_t alert_service_id = {
    .id = {
        .uuid = {
          //  .len = ESP_UUID_LEN_16,
          //  .uuid = {.uuid16 = 0x1811,},

       .len = ESP_UUID_LEN_128,
        .uuid = {.uuid128 = { 0x1E, 0x94, 0x8D, 0xF1, 0x48, 0x31, 0x94, 0xBA, 0x75, 0x4C, 0x3E, 0x50, 0, 0, 0x3D, 0x71 } ,},

        },
        .inst_id = 0,
    },
    .is_primary = true,
};

static esp_gatt_id_t notify_descr_id = {
    .uuid = {
        .len = ESP_UUID_LEN_16,
        .uuid = {.uuid16 = GATT_UUID_CHAR_CLIENT_CONFIG,},
    },
    .inst_id = 0,
};
#define BT_BD_ADDR_STR         "%02x:%02x:%02x:%02x:%02x:%02x"
#define BT_BD_ADDR_HEX(addr)   addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]

static bool connect = false;
static const char device_name[] = "BLE_DEMO";

static esp_ble_scan_params_t ble_scan_params = {
    .scan_type              = BLE_SCAN_TYPE_ACTIVE,
    .own_addr_type          = BLE_ADDR_TYPE_PUBLIC,
    .scan_filter_policy     = BLE_SCAN_FILTER_ALLOW_ALL,
    .scan_interval          = 0x50,
    .scan_window            = 0x30
};


#define PROFILE_NUM 2
#define PROFILE_A_APP_ID 0
#define PROFILE_B_APP_ID 1

struct gattc_profile_inst {
    esp_gattc_cb_t gattc_cb;
    uint16_t gattc_if;
    uint16_t app_id;
    uint16_t conn_id;
    esp_bd_addr_t remote_bda;
};

/* One gatt-based profile one app_id and one gattc_if, this array will store the gattc_if returned by ESP_GATTS_REG_EVT */
static struct gattc_profile_inst gl_profile_tab[PROFILE_NUM] = {
    [PROFILE_A_APP_ID] = {
        .gattc_cb = gattc_profile_a_event_handler,
        .gattc_if = ESP_GATT_IF_NONE,       /* Not get the gatt_if, so initial is ESP_GATT_IF_NONE */
    },
    [PROFILE_B_APP_ID] = {
        .gattc_cb = gattc_profile_b_event_handler,
        .gattc_if = ESP_GATT_IF_NONE,       /* Not get the gatt_if, so initial is ESP_GATT_IF_NONE */
    },
};

static void gattc_profile_a_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param)
{
    uint16_t conn_id = 0;
    esp_ble_gattc_cb_param_t *p_data = (esp_ble_gattc_cb_param_t *)param;

    switch (event) {
    case ESP_GATTC_REG_EVT:
        ESP_LOGI(GATTC_TAG, "REG_EVT");
        esp_ble_gap_set_scan_params(&ble_scan_params);
        break;
    case ESP_GATTC_OPEN_EVT:
        conn_id = p_data->open.conn_id;

        memcpy(gl_profile_tab[PROFILE_A_APP_ID].remote_bda, p_data->open.remote_bda, sizeof(esp_bd_addr_t));
        ESP_LOGI(GATTC_TAG, "ESP_GATTC_OPEN_EVT conn_id %d, if %d, status %d, mtu %d", conn_id, gattc_if, p_data->open.status, p_data->open.mtu);

        ESP_LOGI(GATTC_TAG, "REMOTE BDA  %02x:%02x:%02x:%02x:%02x:%02x",
                            gl_profile_tab[PROFILE_A_APP_ID].remote_bda[0], gl_profile_tab[PROFILE_A_APP_ID].remote_bda[1],
                            gl_profile_tab[PROFILE_A_APP_ID].remote_bda[2], gl_profile_tab[PROFILE_A_APP_ID].remote_bda[3],
                            gl_profile_tab[PROFILE_A_APP_ID].remote_bda[4], gl_profile_tab[PROFILE_A_APP_ID].remote_bda[5]
                         );

        esp_ble_gattc_search_service(gattc_if, conn_id, NULL);
        break;
    case ESP_GATTC_SEARCH_RES_EVT: {
        esp_gatt_srvc_id_t *srvc_id = &p_data->search_res.srvc_id;
        conn_id = p_data->search_res.conn_id;
        ESP_LOGI(GATTC_TAG, "SEARCH RES: conn_id = %x", conn_id);
        if (srvc_id->id.uuid.len == ESP_UUID_LEN_16) {
            ESP_LOGI(GATTC_TAG, "UUID16: %x", srvc_id->id.uuid.uuid.uuid16);
        } else if (srvc_id->id.uuid.len == ESP_UUID_LEN_32) {
            ESP_LOGI(GATTC_TAG, "UUID32: %x", srvc_id->id.uuid.uuid.uuid32);
        } else if (srvc_id->id.uuid.len == ESP_UUID_LEN_128) {
            ESP_LOGI(GATTC_TAG, "UUID128: %x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x", srvc_id->id.uuid.uuid.uuid128[0],
                     srvc_id->id.uuid.uuid.uuid128[1], srvc_id->id.uuid.uuid.uuid128[2], srvc_id->id.uuid.uuid.uuid128[3],
                     srvc_id->id.uuid.uuid.uuid128[4], srvc_id->id.uuid.uuid.uuid128[5], srvc_id->id.uuid.uuid.uuid128[6],
                     srvc_id->id.uuid.uuid.uuid128[7], srvc_id->id.uuid.uuid.uuid128[8], srvc_id->id.uuid.uuid.uuid128[9],
                     srvc_id->id.uuid.uuid.uuid128[10], srvc_id->id.uuid.uuid.uuid128[11], srvc_id->id.uuid.uuid.uuid128[12],
                     srvc_id->id.uuid.uuid.uuid128[13], srvc_id->id.uuid.uuid.uuid128[14], srvc_id->id.uuid.uuid.uuid128[15]);
        } else {
            ESP_LOGE(GATTC_TAG, "UNKNOWN LEN %d", srvc_id->id.uuid.len);
        }
        break;
    }
    case ESP_GATTC_SEARCH_CMPL_EVT:
        conn_id = p_data->search_cmpl.conn_id;
        ESP_LOGI(GATTC_TAG, "SEARCH_CMPL: conn_id = %x, status %d", conn_id, p_data->search_cmpl.status);
        esp_ble_gattc_get_characteristic(gattc_if, conn_id, &alert_service_id, NULL);
        break;
    case ESP_GATTC_GET_CHAR_EVT:
        if (p_data->get_char.status != ESP_GATT_OK) {
            break;
        }
        ESP_LOGI(GATTC_TAG, "GET CHAR: conn_id = %x, status %d", p_data->get_char.conn_id, p_data->get_char.status);
        ESP_LOGI(GATTC_TAG, "GET CHAR: srvc_id = %04x, char_id = %04x", p_data->get_char.srvc_id.id.uuid.uuid.uuid16, p_data->get_char.char_id.uuid.uuid.uuid16);

        if (p_data->get_char.char_id.uuid.uuid.uuid16 ==0x941D){// 0x2a46) {
            ESP_LOGI(GATTC_TAG, "register notify");
            esp_ble_gattc_register_for_notify(gattc_if, gl_profile_tab[PROFILE_A_APP_ID].remote_bda, &alert_service_id, &p_data->get_char.char_id);
        }

        esp_ble_gattc_get_characteristic(gattc_if, conn_id, &alert_service_id, &p_data->get_char.char_id);
        break;
    case ESP_GATTC_REG_FOR_NOTIFY_EVT: {
        uint16_t notify_en = 1;
        ESP_LOGI(GATTC_TAG, "REG FOR NOTIFY: status %d", p_data->reg_for_notify.status);
        ESP_LOGI(GATTC_TAG, "REG FOR_NOTIFY: srvc_id = %04x, char_id = %04x", p_data->reg_for_notify.srvc_id.id.uuid.uuid.uuid16, p_data->reg_for_notify.char_id.uuid.uuid.uuid16);

        esp_ble_gattc_write_char_descr(
                gattc_if,
                conn_id,
                &alert_service_id,
                &p_data->reg_for_notify.char_id,
                &notify_descr_id,
                sizeof(notify_en),
                (uint8_t *)&notify_en,
                ESP_GATT_WRITE_TYPE_RSP,
                ESP_GATT_AUTH_REQ_NONE);
        break;
    }
    case ESP_GATTC_NOTIFY_EVT:
        ESP_LOGI(GATTC_TAG, "NOTIFY: len %d, value %08x", p_data->notify.value_len, *(uint32_t *)p_data->notify.value);
        break;
    case ESP_GATTC_WRITE_DESCR_EVT:
        ESP_LOGI(GATTC_TAG, "WRITE: status %d", p_data->write.status);
        break;
    case ESP_GATTC_SRVC_CHG_EVT: {
        esp_bd_addr_t bda;
        memcpy(bda, p_data->srvc_chg.remote_bda, sizeof(esp_bd_addr_t));
        ESP_LOGI(GATTC_TAG, "ESP_GATTC_SRVC_CHG_EVT, bd_addr:%08x%04x",(bda[0] << 24) + (bda[1] << 16) + (bda[2] << 8) + bda[3],
                 (bda[4] << 8) + bda[5]);
        break;
    }
    default:
        break;
    }
}

static void gattc_profile_b_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param)
{
    uint16_t conn_id = 0;
    esp_ble_gattc_cb_param_t *p_data = (esp_ble_gattc_cb_param_t *)param;

    switch (event) {
    case ESP_GATTC_REG_EVT:
        ESP_LOGI(GATTC_TAG, "REG_EVT");
        break;
    case ESP_GATTC_OPEN_EVT:
        conn_id = p_data->open.conn_id;

        memcpy(gl_profile_tab[PROFILE_B_APP_ID].remote_bda, p_data->open.remote_bda, sizeof(esp_bd_addr_t));
        ESP_LOGI(GATTC_TAG, "ESP_GATTC_OPEN_EVT conn_id %d, if %d, status %d, mtu %d", conn_id, gattc_if, p_data->open.status, p_data->open.mtu);

        ESP_LOGI(GATTC_TAG, "REMOTE BDA  %02x:%02x:%02x:%02x:%02x:%02x",
                            gl_profile_tab[PROFILE_B_APP_ID].remote_bda[0], gl_profile_tab[PROFILE_B_APP_ID].remote_bda[1],
                            gl_profile_tab[PROFILE_B_APP_ID].remote_bda[2], gl_profile_tab[PROFILE_B_APP_ID].remote_bda[3],
                            gl_profile_tab[PROFILE_B_APP_ID].remote_bda[4], gl_profile_tab[PROFILE_B_APP_ID].remote_bda[5]
                         );

        esp_ble_gattc_search_service(gattc_if, conn_id, NULL);
        break;
    case ESP_GATTC_SEARCH_RES_EVT: {
        esp_gatt_srvc_id_t *srvc_id = &p_data->search_res.srvc_id;
        conn_id = p_data->search_res.conn_id;
        ESP_LOGI(GATTC_TAG, "SEARCH RES: conn_id = %x", conn_id);
        if (srvc_id->id.uuid.len == ESP_UUID_LEN_16) {
            ESP_LOGI(GATTC_TAG, "UUID16: %x", srvc_id->id.uuid.uuid.uuid16);
        } else if (srvc_id->id.uuid.len == ESP_UUID_LEN_32) {
            ESP_LOGI(GATTC_TAG, "UUID32: %x", srvc_id->id.uuid.uuid.uuid32);
        } else if (srvc_id->id.uuid.len == ESP_UUID_LEN_128) {
            ESP_LOGI(GATTC_TAG, "UUID128: %x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x,%x", srvc_id->id.uuid.uuid.uuid128[0],
                     srvc_id->id.uuid.uuid.uuid128[1], srvc_id->id.uuid.uuid.uuid128[2], srvc_id->id.uuid.uuid.uuid128[3],
                     srvc_id->id.uuid.uuid.uuid128[4], srvc_id->id.uuid.uuid.uuid128[5], srvc_id->id.uuid.uuid.uuid128[6],
                     srvc_id->id.uuid.uuid.uuid128[7], srvc_id->id.uuid.uuid.uuid128[8], srvc_id->id.uuid.uuid.uuid128[9],
                     srvc_id->id.uuid.uuid.uuid128[10], srvc_id->id.uuid.uuid.uuid128[11], srvc_id->id.uuid.uuid.uuid128[12],
                     srvc_id->id.uuid.uuid.uuid128[13], srvc_id->id.uuid.uuid.uuid128[14], srvc_id->id.uuid.uuid.uuid128[15]);
        } else {
            ESP_LOGE(GATTC_TAG, "UNKNOWN LEN %d", srvc_id->id.uuid.len);
        }
        break;
    }
    case ESP_GATTC_SEARCH_CMPL_EVT:
        conn_id = p_data->search_cmpl.conn_id;
        ESP_LOGI(GATTC_TAG, "SEARCH_CMPL: conn_id = %x, status %d", conn_id, p_data->search_cmpl.status);
        esp_ble_gattc_get_characteristic(gattc_if, conn_id, &alert_service_id, NULL);
        break;
    case ESP_GATTC_GET_CHAR_EVT:
        if (p_data->get_char.status != ESP_GATT_OK) {
            break;
        }
        ESP_LOGI(GATTC_TAG, "GET CHAR: conn_id = %x, status %d", p_data->get_char.conn_id, p_data->get_char.status);
        ESP_LOGI(GATTC_TAG, "GET CHAR: srvc_id = %04x, char_id = %04x", p_data->get_char.srvc_id.id.uuid.uuid.uuid16, p_data->get_char.char_id.uuid.uuid.uuid16);

        if (p_data->get_char.char_id.uuid.uuid.uuid16 == 0x2a46) {
            ESP_LOGI(GATTC_TAG, "register notify");
            esp_ble_gattc_register_for_notify(gattc_if, gl_profile_tab[PROFILE_B_APP_ID].remote_bda, &alert_service_id, &p_data->get_char.char_id);
        }

        esp_ble_gattc_get_characteristic(gattc_if, conn_id, &alert_service_id, &p_data->get_char.char_id);
        break;
    case ESP_GATTC_REG_FOR_NOTIFY_EVT: {
        uint16_t notify_en = 1;
        ESP_LOGI(GATTC_TAG, "REG FOR NOTIFY: status %d", p_data->reg_for_notify.status);
        ESP_LOGI(GATTC_TAG, "REG FOR_NOTIFY: srvc_id = %04x, char_id = %04x", p_data->reg_for_notify.srvc_id.id.uuid.uuid.uuid16, p_data->reg_for_notify.char_id.uuid.uuid.uuid16);

        esp_ble_gattc_write_char_descr(
                gattc_if,
                conn_id,
                &alert_service_id,
                &p_data->reg_for_notify.char_id,
                &notify_descr_id,
                sizeof(notify_en),
                (uint8_t *)&notify_en,
                ESP_GATT_WRITE_TYPE_RSP,
                ESP_GATT_AUTH_REQ_NONE);
        break;
    }
    case ESP_GATTC_NOTIFY_EVT:
        ESP_LOGI(GATTC_TAG, "NOTIFY: len %d, value %08x", p_data->notify.value_len, *(uint32_t *)p_data->notify.value);
        break;
    case ESP_GATTC_WRITE_DESCR_EVT:
        ESP_LOGI(GATTC_TAG, "WRITE: status %d", p_data->write.status);
        break;
    default:
        break;
    }
}

static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param)
{
    uint8_t *adv_name = NULL;
    uint8_t adv_name_len = 0;
    switch (event) {
    case ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT: {
        //the unit of the duration is second
        uint32_t duration = 30;
        esp_ble_gap_start_scanning(duration);
        break;
    }
    case ESP_GAP_BLE_SCAN_START_COMPLETE_EVT:
        //scan start complete event to indicate scan start successfully or failed
        if (param->scan_start_cmpl.status != ESP_BT_STATUS_SUCCESS) {
            ESP_LOGE(GATTC_TAG, "Scan start failed");
        }
        break;
    case ESP_GAP_BLE_SCAN_RESULT_EVT: {
        esp_ble_gap_cb_param_t *scan_result = (esp_ble_gap_cb_param_t *)param;
        switch (scan_result->scan_rst.search_evt) {
        case ESP_GAP_SEARCH_INQ_RES_EVT:
            for (int i = 0; i < 6; i++) {
                ESP_LOGI(GATTC_TAG, "%x:", scan_result->scan_rst.bda[i]);
            }
            ESP_LOGI(GATTC_TAG, "Searched Adv Data Len %d, Scan Response Len %d\n", scan_result->scan_rst.adv_data_len, scan_result->scan_rst.scan_rsp_len);
            ESP_LOGI(GATTC_TAG, "\n");
            adv_name = esp_ble_resolve_adv_data(scan_result->scan_rst.ble_adv,
                                                ESP_BLE_AD_TYPE_NAME_CMPL, &adv_name_len);
            ESP_LOGI(GATTC_TAG, "Searched Device Name Len %d", adv_name_len);
            for (int j = 0; j < adv_name_len; j++) {
                ESP_LOGI(GATTC_TAG, "%c", adv_name[j]);
            }
            if (adv_name != NULL) {
                if (strlen(device_name) == adv_name_len && strncmp((char *)adv_name, device_name, adv_name_len) == 0) {
                    ESP_LOGI(GATTC_TAG, "Searched device %s\n", device_name);
                    if (connect == false) {
                        connect = true;
                        ESP_LOGI(GATTC_TAG, "Connect to the remote device.");
                        esp_ble_gap_stop_scanning();
                        esp_ble_gattc_open(gl_profile_tab[PROFILE_A_APP_ID].gattc_if, scan_result->scan_rst.bda, true);
                      //  esp_ble_gattc_open(gl_profile_tab[PROFILE_B_APP_ID].gattc_if, scan_result->scan_rst.bda, true);
                    }
                }
            }
            break;
        case ESP_GAP_SEARCH_INQ_CMPL_EVT:
            break;
        default:
            break;
        }
        break;
    }

    case ESP_GAP_BLE_SCAN_STOP_COMPLETE_EVT:
        if (param->scan_stop_cmpl.status != ESP_BT_STATUS_SUCCESS){
            ESP_LOGE(GATTC_TAG, "Scan stop failed");
        }
        else {
            ESP_LOGI(GATTC_TAG, "Stop scan successfully");
        }
        break;

    case ESP_GAP_BLE_ADV_STOP_COMPLETE_EVT:
        if (param->adv_stop_cmpl.status != ESP_BT_STATUS_SUCCESS){
            ESP_LOGE(GATTC_TAG, "Adv stop failed");
        }
        else {
            ESP_LOGI(GATTC_TAG, "Stop adv successfully");
        }
        break;

    default:
        break;
    }
}

static void esp_gattc_cb(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param)
{
    ESP_LOGI(GATTC_TAG, "EVT %d, gattc if %d", event, gattc_if);

    /* If event is register event, store the gattc_if for each profile */
    if (event == ESP_GATTC_REG_EVT) {
        if (param->reg.status == ESP_GATT_OK) {
            gl_profile_tab[param->reg.app_id].gattc_if = gattc_if;
        } else {
            ESP_LOGI(GATTC_TAG, "Reg app failed, app_id %04x, status %d",
                    param->reg.app_id,
                    param->reg.status);
            return;
        }
    }

    /* If the gattc_if equal to profile A, call profile A cb handler,
     * so here call each profile's callback */
    do {
        int idx;
        for (idx = 0; idx < PROFILE_NUM; idx++) {
            if (gattc_if == ESP_GATT_IF_NONE || /* ESP_GATT_IF_NONE, not specify a certain gatt_if, need to call every profile cb function */
                    gattc_if == gl_profile_tab[idx].gattc_if) {
                if (gl_profile_tab[idx].gattc_cb) {
                    gl_profile_tab[idx].gattc_cb(event, gattc_if, param);
                }
            }
        }
    } while (0);
}

void ble_client_appRegister(void)
{
    esp_err_t status;

    ESP_LOGI(GATTC_TAG, "register callback");

    //register the scan callback function to the gap module
    if ((status = esp_ble_gap_register_callback(esp_gap_cb)) != ESP_OK) {
        ESP_LOGE(GATTC_TAG, "gap register error, error code = %x", status);
        return;
    }

    //register the callback function to the gattc module
    if ((status = esp_ble_gattc_register_callback(esp_gattc_cb)) != ESP_OK) {
        ESP_LOGE(GATTC_TAG, "gattc register error, error code = %x", status);
        return;
    }
    esp_ble_gattc_app_register(PROFILE_A_APP_ID);
    esp_ble_gattc_app_register(PROFILE_B_APP_ID);
}

void gattc_client_test(void)
{
    esp_bluedroid_init();
    esp_bluedroid_enable();
    ble_client_appRegister();
}

void app_main()
{
    esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
    esp_bt_controller_init(&bt_cfg);
    esp_bt_controller_enable(ESP_BT_MODE_BTDM);

    gattc_client_test();
}

how do I resolve this issue.. once they connect and start geting notification I reset to test it connects again but then this issue happens and NRF51 takes time to disconnect from ESP even when its is scaning NRF51 Seems to be connected because I get disconnection message later.

[f.h-f.s.]

Before you reset do you properly close the connection?
I also sometimes get errors and a closed connection. usually when I try to access some characteristic that is not set by the server.
The nRF Connect app on android helped me debug things. I could close the connection(or pairing?) etc.

[Trialblazer47]

no I don't close connection. I just reset ESP while its connected.

Here is video that shows the issue.
https://www.youtube.com/watch?v=A-Qm5_F ... e=youtu.be

[Trialblazer47]

I am again having this issue. I upgraded to new IDF and so I saw some api have changed and some now event flags. So I wanted to test new gattc_demo example I set up my nrf and services I use in it as it works fine with phone and other gateway we have made with Rpi.I am just making gateway with esp32 to make it cheap. so I configured service UIID and and remote device name. and edited some lines of code.
here is the modified ESP32 code.

Code: Select all

// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
//
// 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 is for gatt client. It can scan ble device, connect one device.
* Run the gatt_server demo, the client demo will automatically connect to the gatt_server demo.
* Client demo will enable gatt_server's notify after connection. Then the two devices will exchange
* data.
*
****************************************************************************/

#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#include "nvs.h"
#include "nvs_flash.h"
#include "controller.h"

#include "bt.h"
#include "esp_gap_ble_api.h"
#include "esp_gattc_api.h"
#include "esp_gatt_defs.h"
#include "esp_bt_main.h"
#include "esp_gatt_common_api.h"

#define GATTC_TAG "GATTC_DEMO"
#define REMOTE_SERVICE_UUID        0x00FF
#define REMOTE_NOTIFY_CHAR_UUID    0xFF01
#define PROFILE_NUM      1
#define PROFILE_A_APP_ID 0
#define INVALID_HANDLE   0

static const char remote_device_name[] = "BTLA";
static bool connect    = false;
static bool get_server = false;
static esp_gattc_char_elem_t *char_elem_result   = NULL;
static esp_gattc_descr_elem_t *descr_elem_result = NULL;

/* eclare static functions */
static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param);
static void esp_gattc_cb(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param);
static void gattc_profile_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param);


static esp_bt_uuid_t remote_filter_service_uuid = {
    .len = ESP_UUID_LEN_16,
    .uuid = {.uuid16 = REMOTE_SERVICE_UUID,},
};

static esp_bt_uuid_t remote_filter_char_uuid = {
    .len = ESP_UUID_LEN_16,
    .uuid = {.uuid16 = REMOTE_NOTIFY_CHAR_UUID,},
};

static esp_bt_uuid_t notify_descr_uuid = {
    .len = ESP_UUID_LEN_16,
    .uuid = {.uuid16 = ESP_GATT_UUID_CHAR_CLIENT_CONFIG,},
};

static esp_ble_scan_params_t ble_scan_params = {
    .scan_type              = BLE_SCAN_TYPE_ACTIVE,
    .own_addr_type          = BLE_ADDR_TYPE_PUBLIC,
    .scan_filter_policy     = BLE_SCAN_FILTER_ALLOW_ALL,
    .scan_interval          = 0x50,
    .scan_window            = 0x30
};

struct gattc_profile_inst {
    esp_gattc_cb_t gattc_cb;
    uint16_t gattc_if;
    uint16_t app_id;
    uint16_t conn_id;
    uint16_t service_start_handle;
    uint16_t service_end_handle;
    uint16_t char_handle;
    esp_bd_addr_t remote_bda;
};

//trailblazer
uint8_t bSerUUID[32] = { 0x1E, 0x94, 0x8D, 0xF1, 0x48, 0x31, 0x94, 0xBA, 0x75, 0x4C, 0x3E, 0x50, 0, 0, 0x3D, 0x71 };

bool compare128UUID(uint8_t u1[])//trailblazer
{
    if ( u1[0] == bSerUUID[0] && u1[1] == bSerUUID[1] && u1[2] == bSerUUID[2] && u1[3] == bSerUUID[3] && u1[4] == bSerUUID[4] && u1[5] == bSerUUID[5] &&
        u1[6] == bSerUUID[6] && u1[7] == bSerUUID[7] && u1[8] == bSerUUID[8] &&  u1[9] == bSerUUID[9] && u1[10] == bSerUUID[10] && u1[11] == bSerUUID[11] &&
        u1[12] == bSerUUID[12] &&  u1[13] == bSerUUID[13] && u1[14] == bSerUUID[14] && u1[15] == bSerUUID[15] )
    {
        return true;
    }
    return false;
}

/* One gatt-based profile one app_id and one gattc_if, this array will store the gattc_if returned by ESP_GATTS_REG_EVT */
static struct gattc_profile_inst gl_profile_tab[PROFILE_NUM] = {
    [PROFILE_A_APP_ID] = {
        .gattc_cb = gattc_profile_event_handler,
        .gattc_if = ESP_GATT_IF_NONE,       /* Not get the gatt_if, so initial is ESP_GATT_IF_NONE */
    },
};

static void gattc_profile_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param)
{
    esp_ble_gattc_cb_param_t *p_data = (esp_ble_gattc_cb_param_t *)param;

    switch (event) {
    case ESP_GATTC_REG_EVT:
        ESP_LOGI(GATTC_TAG, "REG_EVT");
        esp_err_t scan_ret = esp_ble_gap_set_scan_params(&ble_scan_params);
        if (scan_ret){
            ESP_LOGE(GATTC_TAG, "set scan params error, error code = %x", scan_ret);
        }
        break;
    case ESP_GATTC_CONNECT_EVT:{
        //p_data->connect.status always be ESP_GATT_OK
        ESP_LOGI(GATTC_TAG, "ESP_GATTC_CONNECT_EVT conn_id %d, if %d, status %d", p_data->connect.conn_id, gattc_if, p_data->connect.status);
        gl_profile_tab[PROFILE_A_APP_ID].conn_id = p_data->connect.conn_id;
        memcpy(gl_profile_tab[PROFILE_A_APP_ID].remote_bda, p_data->connect.remote_bda, sizeof(esp_bd_addr_t));
        ESP_LOGI(GATTC_TAG, "REMOTE BDA:");
        esp_log_buffer_hex(GATTC_TAG, gl_profile_tab[PROFILE_A_APP_ID].remote_bda, sizeof(esp_bd_addr_t));
        esp_err_t mtu_ret = esp_ble_gattc_send_mtu_req (gattc_if, p_data->connect.conn_id);
        if (mtu_ret){
            ESP_LOGE(GATTC_TAG, "config MTU error, error code = %x", mtu_ret);
        }
        break;
    }
    case ESP_GATTC_OPEN_EVT:
        if (param->open.status != ESP_GATT_OK){
            ESP_LOGE(GATTC_TAG, "open failed, status %d", p_data->open.status);
            break;
        }
        ESP_LOGI(GATTC_TAG, "open success");
        break;
    case ESP_GATTC_CFG_MTU_EVT:
        if (param->cfg_mtu.status != ESP_GATT_OK){
            ESP_LOGE(GATTC_TAG,"config mtu failed, error status = %x", param->cfg_mtu.status);
        }
        ESP_LOGI(GATTC_TAG, "ESP_GATTC_CFG_MTU_EVT, Status %d, MTU %d, conn_id %d", param->cfg_mtu.status, param->cfg_mtu.mtu, param->cfg_mtu.conn_id);
        esp_ble_gattc_search_service(gattc_if, param->cfg_mtu.conn_id, &remote_filter_service_uuid);
        break;
    case ESP_GATTC_SEARCH_RES_EVT: {
        ESP_LOGI(GATTC_TAG, "ESP_GATTC_SEARCH_RES_EVT");
        esp_gatt_srvc_id_t *srvc_id =(esp_gatt_srvc_id_t *)&p_data->search_res.srvc_id;
        if (srvc_id->id.uuid.len == ESP_UUID_LEN_16 && compare128UUID(srvc_id->id.uuid.uuid.uuid128)){//srvc_id->id.uuid.uuid.uuid16 == REMOTE_SERVICE_UUID) {
            ESP_LOGI(GATTC_TAG, "service found");
            get_server = true;
            gl_profile_tab[PROFILE_A_APP_ID].service_start_handle = p_data->search_res.start_handle;
            gl_profile_tab[PROFILE_A_APP_ID].service_end_handle = p_data->search_res.end_handle;
            ESP_LOGI(GATTC_TAG, "UUID16: %x", srvc_id->id.uuid.uuid.uuid16);
        }
        break;
    }
    case ESP_GATTC_SEARCH_CMPL_EVT:
        if (p_data->search_cmpl.status != ESP_GATT_OK){
            ESP_LOGE(GATTC_TAG, "search service failed, error status = %x", p_data->search_cmpl.status);
            break;
        }
        ESP_LOGI(GATTC_TAG, "ESP_GATTC_SEARCH_CMPL_EVT");
        if (get_server){
            uint16_t count = 0;
            esp_gatt_status_t status = esp_ble_gattc_get_attr_count( gattc_if,
                                                                     p_data->search_cmpl.conn_id,
                                                                     ESP_GATT_DB_CHARACTERISTIC,
                                                                     gl_profile_tab[PROFILE_A_APP_ID].service_start_handle,
                                                                     gl_profile_tab[PROFILE_A_APP_ID].service_end_handle,
                                                                     INVALID_HANDLE,
                                                                     &count);
            if (status != ESP_GATT_OK){
                ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_attr_count error");
            }

            if (count > 0){
                char_elem_result = (esp_gattc_char_elem_t *)malloc(sizeof(char_elem_result) * count);
                if (!char_elem_result){
                    ESP_LOGE(GATTC_TAG, "gattc no mem");
                }else{
                    status = esp_ble_gattc_get_char_by_uuid( gattc_if,
                                                             p_data->search_cmpl.conn_id,
                                                             gl_profile_tab[PROFILE_A_APP_ID].service_start_handle,
                                                             gl_profile_tab[PROFILE_A_APP_ID].service_end_handle,
                                                             remote_filter_char_uuid,
                                                             char_elem_result,
                                                             &count);
                    if (status != ESP_GATT_OK){
                        ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_char_by_uuid error");
                    }

                    /*  Every service have only one char in our 'ESP_GATTS_DEMO' demo, so we used first 'char_elem_result' */
                    if (count > 0 && (char_elem_result[0].properties & ESP_GATT_CHAR_PROP_BIT_NOTIFY)){
                        gl_profile_tab[PROFILE_A_APP_ID].char_handle = char_elem_result[0].char_handle;
                        esp_ble_gattc_register_for_notify (gattc_if, gl_profile_tab[PROFILE_A_APP_ID].remote_bda, char_elem_result[0].char_handle);
                    }
                }
                /* free char_elem_result */
                free(char_elem_result);
            }else{
                ESP_LOGE(GATTC_TAG, "no char found");
            }
        }
         break;
    case ESP_GATTC_REG_FOR_NOTIFY_EVT: {
        ESP_LOGI(GATTC_TAG, "ESP_GATTC_REG_FOR_NOTIFY_EVT");
        if (p_data->reg_for_notify.status != ESP_GATT_OK){
            ESP_LOGE(GATTC_TAG, "REG FOR NOTIFY failed: error status = %d", p_data->reg_for_notify.status);
        }else{
            uint16_t count = 0;
            uint16_t notify_en = 1;
            esp_gatt_status_t ret_status = esp_ble_gattc_get_attr_count( gattc_if,
                                                                         gl_profile_tab[PROFILE_A_APP_ID].conn_id,
                                                                         ESP_GATT_DB_DESCRIPTOR,
                                                                         gl_profile_tab[PROFILE_A_APP_ID].service_start_handle,
                                                                         gl_profile_tab[PROFILE_A_APP_ID].service_end_handle,
                                                                         gl_profile_tab[PROFILE_A_APP_ID].char_handle,
                                                                         &count);
            if (ret_status != ESP_GATT_OK){
                ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_attr_count error");
            }
            if (count > 0){
                descr_elem_result = malloc(sizeof(descr_elem_result) * count);
                if (!descr_elem_result){
                    ESP_LOGE(GATTC_TAG, "malloc error, gattc no mem");
                }else{
                    ret_status = esp_ble_gattc_get_descr_by_char_handle( gattc_if,
                                                                         gl_profile_tab[PROFILE_A_APP_ID].conn_id,
                                                                         p_data->reg_for_notify.handle,
                                                                         notify_descr_uuid,
                                                                         descr_elem_result,
                                                                         &count);
                    if (ret_status != ESP_GATT_OK){
                        ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_descr_by_char_handle error");
                    }

                    /* Erery char have only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
                    if (count > 0 && descr_elem_result[0].uuid.len == ESP_UUID_LEN_16 && descr_elem_result[0].uuid.uuid.uuid16 == ESP_GATT_UUID_CHAR_CLIENT_CONFIG){
                        ret_status = esp_ble_gattc_write_char_descr( gattc_if,
                                                                     gl_profile_tab[PROFILE_A_APP_ID].conn_id,
                                                                     descr_elem_result[0].handle,
                                                                     sizeof(notify_en),
                                                                     (uint8_t *)&notify_en,
                                                                     ESP_GATT_WRITE_TYPE_RSP,
                                                                     ESP_GATT_AUTH_REQ_NONE);
                    }

                    if (ret_status != ESP_GATT_OK){
                        ESP_LOGE(GATTC_TAG, "esp_ble_gattc_write_char_descr error");
                    }

                    /* free descr_elem_result */
                    free(descr_elem_result);
                }
            }
            else{
                ESP_LOGE(GATTC_TAG, "decsr not found");
            }

        }
        break;
    }
    case ESP_GATTC_NOTIFY_EVT:
        ESP_LOGE(GATTC_TAG,"ESP_GATTC_SRVC_CHG_EVT");
        ESP_LOGI(GATTC_TAG, "ESP_GATTC_NOTIFY_EVT, receive notify value:");
        esp_log_buffer_hex(GATTC_TAG, p_data->notify.value, p_data->notify.value_len);
        break;
    case ESP_GATTC_WRITE_DESCR_EVT:
        ESP_LOGE(GATTC_TAG,"ESP_GATTC_SRVC_CHG_EVT");
        if (p_data->write.status != ESP_GATT_OK){
            ESP_LOGE(GATTC_TAG, "write descr failed, error status = %x", p_data->write.status);
            break;
        }
        ESP_LOGI(GATTC_TAG, "write descr success ");
        uint8_t write_char_data[35];
        for (int i = 0; i < sizeof(write_char_data); ++i)
        {
            write_char_data[i] = i % 256;
        }
        esp_ble_gattc_write_char( gattc_if,
                                  gl_profile_tab[PROFILE_A_APP_ID].conn_id,
                                  gl_profile_tab[PROFILE_A_APP_ID].char_handle,
                                  sizeof(write_char_data),
                                  write_char_data,
                                  ESP_GATT_WRITE_TYPE_RSP,
                                  ESP_GATT_AUTH_REQ_NONE);
        break;
    case ESP_GATTC_SRVC_CHG_EVT: {
        ESP_LOGE(GATTC_TAG,"ESP_GATTC_SRVC_CHG_EVT");
        esp_bd_addr_t bda;
        memcpy(bda, p_data->srvc_chg.remote_bda, sizeof(esp_bd_addr_t));
        ESP_LOGI(GATTC_TAG, "ESP_GATTC_SRVC_CHG_EVT, bd_addr:");
        esp_log_buffer_hex(GATTC_TAG, bda, sizeof(esp_bd_addr_t));
        break;
    }
    case ESP_GATTC_WRITE_CHAR_EVT:
            ESP_LOGE(GATTC_TAG,"ESP_GATTC_WRITE_CHAR_EVT");
        if (p_data->write.status != ESP_GATT_OK){
            ESP_LOGE(GATTC_TAG, "write char failed, error status = %x", p_data->write.status);
            break;
        }
        ESP_LOGI(GATTC_TAG, "write char success ");
        break;
    case ESP_GATTC_DISCONNECT_EVT:
        connect = false;
        get_server = false;
        ESP_LOGI(GATTC_TAG, "ESP_GATTC_DISCONNECT_EVT, status = %d", p_data->disconnect.status);
        break;
    default:
        break;
    }
}

static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param)
{
    uint8_t *adv_name = NULL;
    uint8_t adv_name_len = 0;
    switch (event) {
    case ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT: {
        //the unit of the duration is second
        uint32_t duration = 30;
        esp_ble_gap_start_scanning(duration);
        break;
    }
    case ESP_GAP_BLE_SCAN_START_COMPLETE_EVT:
        //scan start complete event to indicate scan start successfully or failed
        if (param->scan_start_cmpl.status != ESP_BT_STATUS_SUCCESS) {
            ESP_LOGE(GATTC_TAG, "scan start failed, error status = %x", param->scan_start_cmpl.status);
            break;
        }
        ESP_LOGI(GATTC_TAG, "scan start success");

        break;
    case ESP_GAP_BLE_SCAN_RESULT_EVT: {
        esp_ble_gap_cb_param_t *scan_result = (esp_ble_gap_cb_param_t *)param;
        switch (scan_result->scan_rst.search_evt) {
        case ESP_GAP_SEARCH_INQ_RES_EVT:
    //        esp_log_buffer_hex(GATTC_TAG, scan_result->scan_rst.bda, 6);
    //        ESP_LOGI(GATTC_TAG, "searched Adv Data Len %d, Scan Response Len %d", scan_result->scan_rst.adv_data_len, scan_result->scan_rst.scan_rsp_len);
            adv_name = esp_ble_resolve_adv_data(scan_result->scan_rst.ble_adv,
                                                ESP_BLE_AD_TYPE_NAME_SHORT, &adv_name_len);
  //          ESP_LOGI(GATTC_TAG, "searched Device Name Len %d", adv_name_len);
                if(adv_name_len>0){
                    esp_log_buffer_char(GATTC_TAG, adv_name, adv_name_len);
                    ESP_LOGI(GATTC_TAG, "\n");
                }
            if (adv_name != NULL) {
                if (strlen(remote_device_name) == adv_name_len && strncmp((char *)adv_name, remote_device_name, adv_name_len) == 0) {
                    ESP_LOGI(GATTC_TAG, "searched device %s\n", remote_device_name);
                    if (connect == false) {
                        connect = true;
                        ESP_LOGI(GATTC_TAG, "connect to the remote device.");
                        esp_ble_gap_stop_scanning();
                        esp_ble_gattc_open(gl_profile_tab[PROFILE_A_APP_ID].gattc_if, scan_result->scan_rst.bda, true);
                    }
                }
            }
            break;
        case ESP_GAP_SEARCH_INQ_CMPL_EVT:
            break;
        default:
            break;
        }
        break;
    }

    case ESP_GAP_BLE_SCAN_STOP_COMPLETE_EVT:
        if (param->scan_stop_cmpl.status != ESP_BT_STATUS_SUCCESS){
            ESP_LOGE(GATTC_TAG, "scan stop failed, error status = %x", param->scan_stop_cmpl.status);
            break;
        }
        ESP_LOGI(GATTC_TAG, "stop scan successfully");
        break;

    case ESP_GAP_BLE_ADV_STOP_COMPLETE_EVT:
        if (param->adv_stop_cmpl.status != ESP_BT_STATUS_SUCCESS){
            ESP_LOGE(GATTC_TAG, "adv stop failed, error status = %x", param->adv_stop_cmpl.status);
            break;
        }
        ESP_LOGI(GATTC_TAG, "stop adv successfully");
        break;
    case ESP_GAP_BLE_UPDATE_CONN_PARAMS_EVT:
         ESP_LOGI(GATTC_TAG, "update connetion params status = %d, min_int = %d, max_int = %d,conn_int = %d,latency = %d, timeout = %d",
                  param->update_conn_params.status,
                  param->update_conn_params.min_int,
                  param->update_conn_params.max_int,
                  param->update_conn_params.conn_int,
                  param->update_conn_params.latency,
                  param->update_conn_params.timeout);
        break;
    default:
        break;
    }
}

static void esp_gattc_cb(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param)
{
    ESP_LOGI(GATTC_TAG,"esp_gattc_cb %d\n",event);
    /* If event is register event, store the gattc_if for each profile */
    if (event == ESP_GATTC_REG_EVT) {
        if (param->reg.status == ESP_GATT_OK) {
            gl_profile_tab[param->reg.app_id].gattc_if = gattc_if;
        } else {
            ESP_LOGI(GATTC_TAG, "reg app failed, app_id %04x, status %d",
                    param->reg.app_id,
                    param->reg.status);
            return;
        }
    }

    /* If the gattc_if equal to profile A, call profile A cb handler,
     * so here call each profile's callback */
    do {
        int idx;
        for (idx = 0; idx < PROFILE_NUM; idx++) {
            if (gattc_if == ESP_GATT_IF_NONE || /* ESP_GATT_IF_NONE, not specify a certain gatt_if, need to call every profile cb function */
                    gattc_if == gl_profile_tab[idx].gattc_if) {
                if (gl_profile_tab[idx].gattc_cb) {
                    gl_profile_tab[idx].gattc_cb(event, gattc_if, param);
                }
            }
        }
    } while (0);
}

void app_main()
{
    // Initialize NVS.
    esp_err_t ret = nvs_flash_init();
    if (ret == ESP_ERR_NVS_NO_FREE_PAGES) {
        ESP_ERROR_CHECK(nvs_flash_erase());
        ret = nvs_flash_init();
    }
    ESP_ERROR_CHECK( ret );

    esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
    ret = esp_bt_controller_init(&bt_cfg);
    if (ret) {
        ESP_LOGE(GATTC_TAG, "%s initialize controller failed, error code = %x\n", __func__, ret);
        return;
    }

    ret = esp_bt_controller_enable(ESP_BT_MODE_BTDM);
    if (ret) {
        ESP_LOGE(GATTC_TAG, "%s enable controller failed, error code = %x\n", __func__, ret);
        return;
    }

    ret = esp_bluedroid_init();
    if (ret) {
        ESP_LOGE(GATTC_TAG, "%s init bluetooth failed, error code = %x\n", __func__, ret);
        return;
    }

    ret = esp_bluedroid_enable();
    if (ret) {
        ESP_LOGE(GATTC_TAG, "%s enable bluetooth failed, error code = %x\n", __func__, ret);
        return;
    }

    //register the  callback function to the gap module
    ret = esp_ble_gap_register_callback(esp_gap_cb);
    if (ret){
        ESP_LOGE(GATTC_TAG, "%s gap register failed, error code = %x\n", __func__, ret);
        return;
    }

    //register the callback function to the gattc module
    ret = esp_ble_gattc_register_callback(esp_gattc_cb);
    if(ret){
        ESP_LOGE(GATTC_TAG, "%s gattc register failed, error code = %x\n", __func__, ret);
        return;
    }

    ret = esp_ble_gattc_app_register(PROFILE_A_APP_ID);
    if (ret){
        ESP_LOGE(GATTC_TAG, "%s gattc app register failed, error code = %x\n", __func__, ret);
    }
    esp_err_t local_mtu_ret = esp_ble_gatt_set_local_mtu(500);
    if (local_mtu_ret){
        ESP_LOGE(GATTC_TAG, "set local  MTU failed, error code = %x", local_mtu_ret);
    }

}

this is the error I am getting now.

Code: Select all

I (424) cpu_start: Pro cpu start user code
I (106) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
I (191) system_api: Base MAC address is not set, read default base MAC address from BLK0 of EFUSE
I (491) phy: phy_version: 359.0, e79c19d, Aug 31 2017, 17:06:07, 0, 0
E (521) BT: btc_gattc_call_handler()
I (521) GATTC_DEMO: esp_gattc_cb 0

I (521) GATTC_DEMO: REG_EVT
I (531) GATTC_DEMO: scan start success
I (6541) GATTC_DEMO: BTLA
I (6541) GATTC_DEMO: 

I (6541) GATTC_DEMO: searched device BTLA

I (6541) GATTC_DEMO: connect to the remote device.
I (6551) GATTC_DEMO: stop scan successfully
E (6961) BT: bta_gattc_conn_cback() - cif=3 connected=0 conn_id=3 reason=0x003e
E (6961) BT: p_conn is NULL in bta_gattc_conn_cback

I (6961) GATTC_DEMO: esp_gattc_cb 41

I (6971) GATTC_DEMO: ESP_GATTC_DISCONNECT_EVT, status = 0
I (6971) GATTC_DEMO: esp_gattc_cb 2

E (6981) GATTC_DEMO: open failed, status 133

so sad I should have not updated my IDF I dont even remember what IDF I was using. I updated it for integrating BLUFI and blufi's latest apk was not working with old BLUFI example so they suggested to update IDF. And now I have to make work again to understand the gattc code. lot of it same as old but some parameters to API calls changed.

[kolban]

Unfortunately that's too much source code for me to pour over

Ive been tinkering with some BLE C++ classes and about 3 weeks ago the ESP-IDF APIs changed in the pre3.0 master on Github. What we need to remember is that there are releases of ESP-IDF and pre-releases. If we stick to releases, obviously nothing breaks because they are static and immutable. If ESP-IDF is following semantic versioning then going from 2.x to 3.x is allowed to introduce breaking API changes. When we tap the development stream of the next release, all bets are off from one code drop to another ... and it should be allowed to change APIs from day to day (obviously undesirably but allowed within the "rules").

To continue to work, I migrated my own code to pre3.0 APIs. There were substantial changes in the BLE Client code (though I don't remember making too many changes in the BLE Server code). We appear to be now "handle based" in the client code. My jury is still out on which style is better but I got it working pretty quickly.