[TW#13262] ble client cannot make successful connection with server

[joicetm]

Hi,

I was working on BLE client to connect with a pulse-oximeter server, i was able to make the connection and read the data. but i am not able to make the connection consistently, ie.. i need to restart the device for around 10 to 15 times to make a successful connection. Connection fail to establish error(bta_gattc_conn_cback() reason0x003e ) occurs. and sometimes l2cap connection canceled error.

[Weijian-Espressif]

@joicetm we need more information to locate the reason, please open the bt log in bt_trace.h. By the way, please inform the information of your bt chip . please let me know if there are more information.

[Weijian-Espressif]

hi @joicetm , we have a demo "gatt_security_server" as server. you can refer to the demo.

In our gattc_demo , when get server pairing request, gattc "esp_gap_cb" func would get ESP_GAP_BLE_SEC_REQ_EVT , you need send a response like this :

gattc_demo.c.zip

case ESP_GAP_BLE_SEC_REQ_EVT:
    ESP_LOGI(GATTC_TAG, "-----ESP_GAP_BLE_SEC_REQ_EVT");
    esp_ble_gap_security_rsp(param->ble_security.ble_req.bd_addr, true);
    break;

[joicetm]

Hi Weijan,

thanks for the reply, much appreciated. I have already tried this, and worked a few times out of too many attempts. actually my server is damaged now. until i get the new device which i have ordered, i could not test it. now i know that i was going in the right direction with pairing,

once i get my new server module, i will reply with more details

once again thanks for the support. Joice

On Thu, Jul 13, 2017 at 1:23 PM, weijian_Espressif <notifications@github.com

wrote:

hi @joicetm https://github.com/joicetm , we have a demo "gatt_security_server" as server. you can refer to the demo.

In our gattc_demo , when get server pairing request, gattc would get ESP_GAP_BLE_SEC_REQ_EVT in gap callback func, you need send a response like this :

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: 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_CMPL, &adv_name_len); ESP_LOGI(GATTC_TAG, "Searched Device Name Len %d", adv_name_len); esp_log_buffer_char(GATTC_TAG, adv_name, adv_name_len); ESP_LOGI(GATTC_TAG, "\n"); 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; //**** pair request need response *****// case ESP_GAP_BLE_SEC_REQ_EVT: ESP_LOGI(GATTC_TAG, "-----ESP_GAP_BLE_SEC_REQ_EVT"); esp_ble_gap_security_rsp(param->ble_security.ble_req.bd_addr, true); break;

case ESP_GAP_BLE_LOCAL_ER_EVT: ESP_LOGI(GATTC_TAG, "-----ESP_GAP_BLE_LOCAL_ER_EVT"); break; case ESP_GAP_BLE_KEY_EVT: ESP_LOGI(GATTC_TAG, "-----ESP_GAP_BLE_KEY_EVT"); ESP_LOGI(GATTC_TAG, "key type = %s", esp_key_type_to_str(param->ble_security.ble_key.key_type)); break; case ESP_GAP_BLE_AUTH_CMPL_EVT: ESP_LOGI(GATTC_TAG, "-----ESP_GAP_BLE_AUTH_CMPL_EVT"); ESP_LOGI(GATTC_TAG, "address type = %d", param->ble_security.auth_cmpl.addr_type); ESP_LOGI(GATTC_TAG, "pair status = %s",param->ble_security.auth_cmpl.success ? "success" : "fail"); break; default: ESP_LOGI(GATTC_TAG, "=========gap event %d", event); break; }

}

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--

Thanks and Regards, Joice TM

ProtoCentral Electronics

[Weijian-Espressif]

👌

[FayeY]

Hi @joicetm , is there any update?

[FayeY]

Hi @joicetm , I‘m going to close this issue. If your problem is still unsolved, please feel free to reopen it.