Unable to setPin to connect to Bluetooth ELM327

[JayKapse]

Board

ESP32-D0WDQ5

Device Description

No hardware, directly connected to Mac for power and flashing.

Hardware Configuration

No hardware, directly connected to Mac for power and flashing.

Version

latest master (checkout manually)

IDE Name

Arduino IDE

Operating System

macOS Sonoma v14.5 (23F79)

Flash frequency

80Mhz

PSRAM enabled

no

Upload speed

921600

Description

I'm not able to use the setPin parameter. I have tried connecting the same ELM327 adapter using an android tablet and it works with the pin code "1234". I have tried running the code without the setPin parameter and it is not able to connect to the adapter.

I am trying to use the ELMduino library for the project, but the error comes from the ESP32 board installation according to the path displayed in the console.

Sketch

#include "BluetoothSerial.h"
#include "ELMduino.h"


BluetoothSerial SerialBT;
#define ELM_PORT   SerialBT
#define DEBUG_PORT Serial


ELM327 myELM327;


uint32_t rpm = 0;


void setup()
{
#if LED_BUILTIN
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);
#endif

  DEBUG_PORT.begin(115200);
  ELM_PORT.setPin("1234");
  ELM_PORT.begin("ArduHUD", true);
  
  if (!ELM_PORT.connect("OBDII"))
  {
    DEBUG_PORT.println("Couldn't connect to OBD scanner - Phase 1");
    while(1);
  }

  if (!myELM327.begin(ELM_PORT, true, 2000))
  {
    Serial.println("Couldn't connect to OBD scanner - Phase 2");
    while (1);
  }

  Serial.println("Connected to ELM327");
}


void loop()
{
  float tempRPM = myELM327.rpm();

  if (myELM327.nb_rx_state == ELM_SUCCESS)
  {
    rpm = (uint32_t)tempRPM;
    Serial.print("RPM: "); Serial.println(rpm);
  }
  else if (myELM327.nb_rx_state != ELM_GETTING_MSG)
    myELM327.printError();
}

Debug Message

/private/var/folders/fm/2sf3tvf92vxcwskbwrwpjpyr0000gn/T/.arduinoIDE-unsaved202463-67124-5xxjv0.o4u6/sketch_jul3a/sketch_jul3a.ino: In function 'void setup()':
/private/var/folders/fm/2sf3tvf92vxcwskbwrwpjpyr0000gn/T/.arduinoIDE-unsaved202463-67124-5xxjv0.o4u6/sketch_jul3a/sketch_jul3a.ino:24:12: error: 'class BluetoothSerial' has no member named 'setPin'
   24 |   ELM_PORT.setPin("1234");
      |            ^~~~~~

exit status 1

Compilation error: 'class BluetoothSerial' has no member named 'setPin'

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[lbernstone]

SSP is enabled in newer releases. To use a fixed pin, you would need to compile your own libraries.

[brugomes1407]

Hi, I have the same problem but I found a solution below:
Insert

#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run make menuconfig to and enable it
#endif

#if !defined(CONFIG_BT_SPP_ENABLED)
#error Serial Bluetooth not available or not enabled. It is only available for the ESP32 chip.
#endif

#define BT_DISCOVER_TIME 10000
esp_spp_sec_t sec_mask = ESP_SPP_SEC_NONE; // or ESP_SPP_SEC_ENCRYPT|ESP_SPP_SEC_AUTHENTICATE to request pincode confirmation
esp_spp_role_t role = ESP_SPP_ROLE_SLAVE; // or ESP_SPP_ROLE_MASTER
uint8_t address[6] = {0x00, 0x10, 0xCC, 0x4F, 0x36, 0x03};

Insert in void setup()
if (!ELM_PORT.connect(address, sec_mask, role))