ESP_32 BT CLASSIC : SerialBluetooth lib. as MASTER : SCAN AND CONNECT TO CLIENT

[rommo911]

Hardware:

Board: ESP32 Dev Module WROOM-32 Core Installation version: 1.0.0 IDE name: Arduino IDE Flash Frequency: 80Mhz PSRAM enabled: yes Upload Speed: 115200 Computer OS: Windows 10

Description:

Describe your problem here

hello every one , this is my first post over here i am new to the ESP-32 : i want to use it as serial bt connection : BT CLASSSIC + Master role : scan an connect to client : search by name or by MAC and connect. as far as i know the serialbluetooth library does the trick but only in slave mode as server i ran some research and use the library code + code from idf ide example (SPP_initiator_example) the search by bt name failed i will post the failure in another post , but with a trick to search only by mac it does work: what i get is search + compare mac add + connect to client but NO CONNECTION IS OPEN tried to connect to my phone, my pc and an OBDII adapter in connect succefully and with pin code authinticate and code authinticating success all is done but i am no getting a connection established : waiting for
ESP_SPP_OPEN_EVT://Client connection open log_i("ESP_SPP_CLINT_CONNECT_EVT"); but not getting it i am sure i am missing something over here maybe you help me thank all .

Sketch: (leave the backquotes for code formatting)

//Change the code below by your sketch
#include <Arduino.h>

// Copyright 2018 Evandro Luis Copercini
//
// 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 "sdkconfig.h"
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "time.h"
#include "sys/time.h"

#if defined(CONFIG_BT_ENABLED) && defined(CONFIG_BLUEDROID_ENABLED)

#ifdef ARDUINO_ARCH_ESP32
#include "esp32-hal-log.h"
#endif

#include "esp_bt.h"
#include "esp_bt_main.h"
#include "esp_gap_bt_api.h"
#include "esp_bt_device.h"
#include "esp_spp_api.h"
#include "esp_log.h"

#ifdef ARDUINO_ARCH_ESP32
#include "esp32-hal-log.h"
#endif

#include "BluetoothSerial.h"

const char * _spp_server_name = "ESP32SPP";
#define SPP_DATA_LEN ESP_SPP_MAX_MTU
static uint8_t spp_data[SPP_DATA_LEN];
#define RX_QUEUE_SIZE 512
#define TX_QUEUE_SIZE 32
static uint32_t _spp_client = 0;
static xQueueHandle _spp_rx_queue = NULL;
static xQueueHandle _spp_tx_queue = NULL;
static SemaphoreHandle_t _spp_tx_done = NULL;
static TaskHandle_t _spp_task_handle = NULL;
static EventGroupHandle_t _spp_event_group = NULL;
static boolean secondConnectionAttempt;
static esp_spp_cb_t * custom_spp_callback = NULL; 

////

static struct timeval time_new, time_old;
static long data_num = 0;

static const esp_spp_mode_t esp_spp_mode = ESP_SPP_MODE_CB;

static const esp_spp_sec_t sec_mask = ESP_SPP_SEC_NONE;
//ESP_SPP_SEC_AUTHINTICATE
static const esp_spp_role_t role_master = ESP_SPP_ROLE_MASTER;

static esp_bd_addr_t peer_bd_addr;
static uint8_t peer_bdname_len;
static char peer_bdname[ESP_BT_GAP_MAX_BDNAME_LEN + 1];
static const char remote_device_name[] =  "OBDII";
static uint8_t REMOTE_ADDR[ESP_BD_ADDR_LEN] = {0x00, 0x1D, 0xA5, 0x68, 0x98, 0x8B}; //OBD
static uint8_t REMOTE_ADDR2[ESP_BD_ADDR_LEN] = {0x38, 0x78, 0x62, 0x96, 0x8d, 0xe1}; //xz1
static uint8_t REMOTE_ADDR1[ESP_BD_ADDR_LEN] = {0xcc, 0x52, 0xAF, 0xC9, 0x6C, 0x4A}; //pc
static const esp_bt_inq_mode_t inq_mode = ESP_BT_INQ_MODE_GENERAL_INQUIRY;
static const uint8_t inq_len = 30;
static const uint8_t inq_num_rsps = 0;

#define SPP_TAG "SPP_INITIATOR_DEMO"
#define EXCAMPLE_DEVICE_NAME "ESP_SPP_INITIATOR"
///

#define SPP_RUNNING     0x01
#define SPP_CONNECTED   0x02
#define SPP_CONGESTED   0x04

typedef struct {
        size_t len;
        uint8_t data[];
} spp_packet_t;

static esp_err_t _spp_queue_packet(uint8_t *data, size_t len){
    if(!data || !len){
        log_w("No data provided");
        return ESP_OK;
    }
    spp_packet_t * packet = (spp_packet_t*)malloc(sizeof(spp_packet_t) + len);
    if(!packet){
        log_e("SPP TX Packet Malloc Failed!");
        return ESP_FAIL;
    }
    packet->len = len;
    memcpy(packet->data, data, len);
    if (xQueueSend(_spp_tx_queue, &packet, portMAX_DELAY) != pdPASS) {
        log_e("SPP TX Queue Send Failed!");
        free(packet);
        return ESP_FAIL;
    }
    return ESP_OK;
}

const uint16_t SPP_TX_MAX = 330;
static uint8_t _spp_tx_buffer[SPP_TX_MAX];
static uint16_t _spp_tx_buffer_len = 0;

static bool _spp_send_buffer(){
    if((xEventGroupWaitBits(_spp_event_group, SPP_CONGESTED, pdFALSE, pdTRUE, portMAX_DELAY) & SPP_CONGESTED)){
        esp_err_t err = esp_spp_write(_spp_client, _spp_tx_buffer_len, _spp_tx_buffer);
        if(err != ESP_OK){
            log_e("SPP Write Failed! [0x%X]", err);
            return false;
        }
        _spp_tx_buffer_len = 0;
        if(xSemaphoreTake(_spp_tx_done, portMAX_DELAY) != pdTRUE){
            log_e("SPP Ack Failed!");
            return false;
        }
        return true;
    }
    return false;
}

static void _spp_tx_task(void * arg){
    spp_packet_t *packet = NULL;
    size_t len = 0, to_send = 0;
    uint8_t * data = NULL;
    for (;;) {
        if(_spp_tx_queue && xQueueReceive(_spp_tx_queue, &packet, portMAX_DELAY) == pdTRUE && packet){
            if(packet->len <= (SPP_TX_MAX - _spp_tx_buffer_len)){
                memcpy(_spp_tx_buffer+_spp_tx_buffer_len, packet->data, packet->len);
                _spp_tx_buffer_len+=packet->len;
                free(packet);
                packet = NULL;
                if(SPP_TX_MAX == _spp_tx_buffer_len || uxQueueMessagesWaiting(_spp_tx_queue) == 0){
                    _spp_send_buffer();
                }
            } else {
                len = packet->len;
                data = packet->data;
                to_send = SPP_TX_MAX - _spp_tx_buffer_len;
                memcpy(_spp_tx_buffer+_spp_tx_buffer_len, data, to_send);
                _spp_tx_buffer_len = SPP_TX_MAX;
                data += to_send;
                len -= to_send;
                _spp_send_buffer();
                while(len >= SPP_TX_MAX){
                    memcpy(_spp_tx_buffer, data, SPP_TX_MAX);
                    _spp_tx_buffer_len = SPP_TX_MAX;
                    data += SPP_TX_MAX;
                    len -= SPP_TX_MAX;
                    _spp_send_buffer();
                }
                if(len){
                    memcpy(_spp_tx_buffer, data, len);
                    _spp_tx_buffer_len += len;
                    free(packet);
                    packet = NULL;
                    if(uxQueueMessagesWaiting(_spp_tx_queue) == 0){
                        _spp_send_buffer();
                    }
                }
            }
        } else {
            log_e("Something went horribly wrong");
        }
    }
    vTaskDelete(NULL);
    _spp_task_handle = NULL;
}

static void esp_spp_cb(esp_spp_cb_event_t event, esp_spp_cb_param_t *param)
{
    switch (event)
   {
    case ESP_SPP_INIT_EVT:
        log_i("ESP_SPP_INIT_EVT");
        esp_bt_gap_set_scan_mode(ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE);
    log_i("ESP_SPP_INIT_EVTset mode");
        esp_bt_gap_start_discovery(inq_mode, inq_len, inq_num_rsps);
        xEventGroupSetBits(_spp_event_group, SPP_RUNNING);
        break;

    case ESP_SPP_SRV_OPEN_EVT://Server connection open
        log_i("ESP_SPP_SRV_OPEN_EVT");
        break;

    case ESP_SPP_CLOSE_EVT://Client connection closed
        xEventGroupClearBits(_spp_event_group, SPP_CONNECTED);
        log_i("ESP_SPP_CLOSE_EVT");
        _spp_client = 0; 
        break;

    case ESP_SPP_CONG_EVT://connection congestion status changed
        if(param->cong.cong){
            xEventGroupClearBits(_spp_event_group, SPP_CONGESTED);
        } else {
            xEventGroupSetBits(_spp_event_group, SPP_CONGESTED);
        }
        log_v("ESP_SPP_CONG_EVT: %s", param->cong.cong?"CONGESTED":"FREE");
        break;

    case ESP_SPP_WRITE_EVT://write operation completed
        if(param->write.cong){
            xEventGroupClearBits(_spp_event_group, SPP_CONGESTED);
        }
        xSemaphoreGive(_spp_tx_done);//we can try to send another packet
        log_i("ESP_SPP_WRITE_EVT: %u %s", param->write.len, param->write.cong?"CONGESTED":"FREE");
        break;

    case ESP_SPP_DATA_IND_EVT://connection received data
        log_i("ESP_SPP_DATA_IND_EVT len=%d handle=%d", param->data_ind.len, param->data_ind.handle);
        esp_log_buffer_hex("",param->data_ind.data,param->data_ind.len); //for low level debug
        ets_printf("r:%u\n", param->data_ind.len);

        if (_spp_rx_queue != NULL){
            for (int i = 0; i < param->data_ind.len; i++){
                if(xQueueSend(_spp_rx_queue, param->data_ind.data + i, (TickType_t)0) != pdTRUE){
                    log_e("RX Full! Discarding %u bytes", param->data_ind.len - i);
                    break;
                }
            }
        }
        break;

        //should maybe delete those.
    case ESP_SPP_DISCOVERY_COMP_EVT://discovery complete
        log_i("ESP_SPP_DISCOVERY_COMP_EVT status=%d scn_num=%d",param->disc_comp.status, param->disc_comp.scn_num);
        if (param->disc_comp.status == ESP_SPP_SUCCESS)
        esp_spp_connect(sec_mask, role_master, param->disc_comp.scn[0], peer_bd_addr); log_i("ESP_connect");
    if (!_spp_client) {_spp_client = param->open.handle ; xEventGroupSetBits(_spp_event_group, SPP_CONNECTED);}
        break;
    case ESP_SPP_OPEN_EVT://Client connection open
        log_i("ESP_SPP_CLINT_CONNECT_EVT");
        break;
    case ESP_SPP_START_EVT://server started
        log_i("ESP_SPP_START_EVT");
        break;
    case ESP_SPP_CL_INIT_EVT://client initiated a connection
        log_i("ESP_SPP_CL_INIT_EVT");
        break;
    default:
        break;
    }
    if(custom_spp_callback)(*custom_spp_callback)(event, param);

}
static void esp_bt_gap_cb(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_param_t *param)
{
    switch(event){
    case ESP_BT_GAP_DISC_RES_EVT:
            log_i("ESP_BT_GAP_DISC_RES_EVT");
        esp_log_buffer_hex("ESP", param->disc_res.bda, ESP_BD_ADDR_LEN);
            if (memcmp(param->disc_res.bda, REMOTE_ADDR, ESP_BD_ADDR_LEN) == 0)
            {
                memcpy(peer_bd_addr, param->disc_res.bda, ESP_BD_ADDR_LEN);
                esp_spp_start_discovery(peer_bd_addr);
                esp_bt_gap_cancel_discovery();
            }
        break;
    case ESP_BT_GAP_DISC_STATE_CHANGED_EVT:
       log_i("ESP_BT_GAP_DISC_STATE_CHANGED_EVT");
        break;
    case ESP_BT_GAP_RMT_SRVCS_EVT:
       log_i("ESP_BT_GAP_RMT_SRVCS_EVT");
        break;
    case ESP_BT_GAP_RMT_SRVC_REC_EVT:
       log_i("ESP_BT_GAP_RMT_SRVC_REC_EVT");
        break;
    case ESP_BT_GAP_AUTH_CMPL_EVT:{
        if (param->auth_cmpl.stat == ESP_BT_STATUS_SUCCESS) {
            log_i("authentication success: %s", param->auth_cmpl.device_name);
            esp_log_buffer_hex("ESP", param->auth_cmpl.bda, ESP_BD_ADDR_LEN);
        } else {
            log_e("authentication failed, status:%d", param->auth_cmpl.stat);
        }
        break;
    }
    case ESP_BT_GAP_PIN_REQ_EVT:{
        log_i("ESP_BT_GAP_PIN_REQ_EVT min_16_digit:%d", param->pin_req.min_16_digit);
        if (param->pin_req.min_16_digit) {
            log_i("Input pin code: 0000 0000 0000 0000");
            esp_bt_pin_code_t pin_code = {0};
            esp_bt_gap_pin_reply(param->pin_req.bda, true, 16, pin_code);
        } else {
            log_i("Input pin code: 1234");
            esp_bt_pin_code_t pin_code;
            pin_code[0] = '1';
            pin_code[1] = '2';
            pin_code[2] = '3';
            pin_code[3] = '4';
            esp_bt_gap_pin_reply(param->pin_req.bda, true, 4, pin_code);
        }
        break;
    }
    case ESP_BT_GAP_CFM_REQ_EVT:
       log_i("ESP_BT_GAP_CFM_REQ_EVT Please compare the numeric value: %d", param->cfm_req.num_val);
        esp_bt_gap_ssp_confirm_reply(param->cfm_req.bda, true);
        break;
    case ESP_BT_GAP_KEY_NOTIF_EVT:
        log_i("ESP_BT_GAP_KEY_NOTIF_EVT passkey:%d", param->key_notif.passkey);
        break;
    case ESP_BT_GAP_KEY_REQ_EVT:
        log_i("ESP_BT_GAP_KEY_REQ_EVT Please enter passkey!");
        break;
    default:
        break;
    }
}

static bool _init_bt(const char *deviceName)
{
    if(!_spp_event_group){
        _spp_event_group = xEventGroupCreate();
        if(!_spp_event_group){
            log_e("SPP Event Group Create Failed!");
            return false;
        }
        xEventGroupClearBits(_spp_event_group, 0xFFFFFF);
        xEventGroupSetBits(_spp_event_group, SPP_CONGESTED);
    }
    if (_spp_rx_queue == NULL){
        _spp_rx_queue = xQueueCreate(RX_QUEUE_SIZE, sizeof(uint8_t)); //initialize the queue
        if (_spp_rx_queue == NULL){
            log_e("RX Queue Create Failed");
            return false;
        }
    }
    if (_spp_tx_queue == NULL){
        _spp_tx_queue = xQueueCreate(TX_QUEUE_SIZE, sizeof(spp_packet_t*)); //initialize the queue
        if (_spp_tx_queue == NULL){
            log_e("TX Queue Create Failed");
            return false;
        }
    }
    if(_spp_tx_done == NULL){
        _spp_tx_done = xSemaphoreCreateBinary();
        if (_spp_tx_done == NULL){
            log_e("TX Semaphore Create Failed");
            return false;
        }
        xSemaphoreTake(_spp_tx_done, 0);
    }

    if(!_spp_task_handle){
        xTaskCreate(_spp_tx_task, "spp_tx", 4096, NULL, 2, &_spp_task_handle);
        if(!_spp_task_handle){
            log_e("Network Event Task Start Failed!");
            return false;
        }
    }
    esp_bt_controller_mem_release(ESP_BT_MODE_BLE);
    if (!btStarted() && !btStart()){
        log_e("initialize controller failed");
        return false;
    }

    esp_bluedroid_status_t bt_state = esp_bluedroid_get_status();

    if (bt_state == ESP_BLUEDROID_STATUS_UNINITIALIZED){
        if (esp_bluedroid_init()) {
            log_e("initialize bluedroid failed");
            return false;
        }
    }

    if (bt_state != ESP_BLUEDROID_STATUS_ENABLED){
        if (esp_bluedroid_enable()) {
            log_e("enable bluedroid failed");
            return false;
        }
    }
    if (esp_bt_gap_register_callback(esp_bt_gap_cb) != ESP_OK) {
        log_e(" gap register failed: \n");
        return false;
    }

    if (esp_spp_register_callback(esp_spp_cb) != ESP_OK){
        log_e("spp register failed");
        return false;
    }

    if (esp_spp_init(esp_spp_mode) != ESP_OK){
        log_e("spp init failed");
        return false;
    }

    esp_bt_dev_set_device_name(deviceName);

/* Set default parameters for Secure Simple Pairing */
    esp_bt_sp_param_t param_type = ESP_BT_SP_IOCAP_MODE;
    esp_bt_io_cap_t iocap = ESP_BT_IO_CAP_IO;
    esp_bt_gap_set_security_param(param_type, &iocap, sizeof(uint8_t));

    /*
     * Set default parameters for Legacy Pairing
     * Use variable pin, input pin code when pairing
     */
    esp_bt_pin_type_t pin_type = ESP_BT_PIN_TYPE_VARIABLE;
    esp_bt_pin_code_t pin_code;
    esp_bt_gap_set_pin(pin_type, 0, pin_code);

  // the default BTA_DM_COD_LOUDSPEAKER does not work with the macOS BT stack
   esp_bt_cod_t cod;
  cod.major = 0b00001;
 cod.minor = 0b000100;
 cod.service = 0b00000010110;
 if (esp_bt_gap_set_cod(cod, ESP_BT_INIT_COD) != ESP_OK) {
    log_e("set cod failed");
    return false;
  }

    return true;
}

static bool _stop_bt()
{
    if (btStarted()){
        if(_spp_client)
            esp_spp_disconnect(_spp_client);
        esp_spp_deinit();
        esp_bluedroid_disable();
        esp_bluedroid_deinit();
        btStop();
    }
    _spp_client = 0;
    if(_spp_task_handle){
        vTaskDelete(_spp_task_handle);
        _spp_task_handle = NULL;
    }
    if(_spp_event_group){
        vEventGroupDelete(_spp_event_group);
        _spp_event_group = NULL;
    }
    if(_spp_rx_queue){
        vQueueDelete(_spp_rx_queue);
        //ToDo: clear RX queue when in packet mode
        _spp_rx_queue = NULL;
    }
    if(_spp_tx_queue){
        spp_packet_t *packet = NULL;
        while(xQueueReceive(_spp_tx_queue, &packet, 0) == pdTRUE){
            free(packet);
        }
        vQueueDelete(_spp_tx_queue);
        _spp_tx_queue = NULL;
    }
    if (_spp_tx_done) {
        vSemaphoreDelete(_spp_tx_done);
        _spp_tx_done = NULL;
    }
    return true;
}

/*
 * Serial Bluetooth Arduino
 *
 * */

BluetoothSerial::BluetoothSerial()
{
    local_name = "ESP32"; //default bluetooth name
}

BluetoothSerial::~BluetoothSerial(void)
{
  //  _stop_bt();
}

bool BluetoothSerial::begin(String localName)
{
    if (localName.length()){
        local_name = localName;
    }
    return _init_bt(local_name.c_str());
}

int BluetoothSerial::available(void)
{
    if (_spp_rx_queue == NULL){
        return 0;
    }
    return uxQueueMessagesWaiting(_spp_rx_queue);
}

int BluetoothSerial::peek(void)
{
    uint8_t c;
    if (_spp_rx_queue && xQueuePeek(_spp_rx_queue, &c, 0)){
        return c;
    }
    return -1;
}

bool BluetoothSerial::hasClient(void)
{
    if (!_spp_client) return 0 ; else return 1 ;
}

int BluetoothSerial::read(void)
{

    uint8_t c = 0;
    if (_spp_rx_queue && xQueueReceive(_spp_rx_queue, &c, 0)){
        return c;
    }
    return -1;
}

size_t BluetoothSerial::write(uint8_t c)
{
    return write(&c, 1);
}

size_t BluetoothSerial::write(const uint8_t *buffer, size_t size)
{
    if (!_spp_client){
        return 0;
    }
    return (_spp_queue_packet((uint8_t *)buffer, size) == ESP_OK) ? size : 0;
}

void BluetoothSerial::flush()
{
    while(read() >= 0){}
}

void BluetoothSerial::end()
{
   // _stop_bt();
}

esp_err_t BluetoothSerial::register_callback(esp_spp_cb_t * callback)
{
    custom_spp_callback = callback;
    return ESP_OK;
}

#endif

Debug Messages:

14:45:18.613 -> [I][BluetoothSerial_edited.cpp:189] esp_spp_cb(): ESP_SPP_INIT_EVT
14:45:18.613 -> [I][BluetoothSerial_edited.cpp:191] esp_spp_cb(): ESP_SPP_INIT_EVTset mode
14:45:18.613 -> [I][BluetoothSerial_edited.cpp:276] esp_bt_gap_cb(): ESP_BT_GAP_DISC_STATE_CHANGED_EVT
14:45:18.852 -> [I][BluetoothSerial_edited.cpp:266] esp_bt_gap_cb(): ESP_BT_GAP_DISC_RES_EVT
14:45:18.921 -> [I][BluetoothSerial_edited.cpp:266] esp_bt_gap_cb(): ESP_BT_GAP_DISC_RES_EVT
14:45:18.955 -> [I][BluetoothSerial_edited.cpp:266] esp_bt_gap_cb(): ESP_BT_GAP_DISC_RES_EVT
14:45:19.195 -> [I][BluetoothSerial_edited.cpp:266] esp_bt_gap_cb(): ESP_BT_GAP_DISC_RES_EVT
14:45:19.229 -> [I][BluetoothSerial_edited.cpp:266] esp_bt_gap_cb(): ESP_BT_GAP_DISC_RES_EVT
14:45:22.217 -> [I][BluetoothSerial_edited.cpp:266] esp_bt_gap_cb(): ESP_BT_GAP_DISC_RES_EVT
14:45:22.217 -> [I][BluetoothSerial_edited.cpp:276] esp_bt_gap_cb(): SP_BT_GAP_DISC_STATE_CHANGED_EVT
14:45:24.460 -> [I][BluetoothSerial_edited.cpp:240] esp_spp_cb(): ESP_SPP_DISCOVERY_COMP_EVT status=0 scn_num=1
14:45:24.460 -> [I][BluetoothSerial_edited.cpp:242] esp_spp_cb(): ESP_connect
14:45:24.460 -> [I][BluetoothSerial_edited.cpp:254] esp_spp_cb(): ESP_SPP_CL_INIT_EVT
14:45:24.494 -> [I][BluetoothSerial_edited.cpp:246] esp_spp_cb(): ESP_SPP_CLINT_CONNECT_EVT

[hhk7734]

I'm not sure if this is related to 'sdkconfig.h'. But, I think #2320 helps.

[selalipop]

https://github.com/SelaliAdobor/BTClassicSPP

Created a PR for the BTClassicSPP library based off this repo that adds support for master with a fixed pin (adding a variable pin would be pretty straight forward)

[hhk7734]

https://github.com/SelaliAdobor/BTClassicSPP

Created a PR for the BTClassicSPP library based off this repo that adds support for master with a fixed pin (adding a variable pin would be pretty straight forward)

is it tested?

[selalipop]

Not sure what you mean

[hhk7734]

Oh, I'm sorry. I've misread the content because I was concentrating on reading the code.

I got a clue about this when reading #2320. Someone said It's not a code problem, but a configuration problem.

I'm trying to rebuild static library for BT after changing config using idf.py. I'll leave a comment when the results come out.

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