Esp32 with elm327 not getting data

Using Arduino Programming Questions
1

I am using this code.
As i cannot use a laptop in the car i cannot read out the serial monitor
But i get no rpm on the display. The value stays zero (0)
What am i doing wrong?
As the screen goes black before the 0 appears, i assume the esp32 is connected to the elm327. And in the test with the elm powered bij 12v the serial reports that they are connected.


#include "BluetoothSerial.h"
#include "ELMduino.h"
#include <Adafruit_GFX.h>     
#include <Adafruit_ILI9341.h>   
#define TFT_SCK    18
#define TFT_MOSI   23
#define TFT_MISO   19
#define TFT_CS    22     
#define TFT_RST   17     
#define TFT_DC    21    
#define ELM_PORT   SerialBT
#define DEBUG_PORT Serial
BluetoothSerial SerialBT;
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);
uint8_t address[6]  = {0x88, 0x18, 0x56, 0x68, 0x98, 0xEB}; 
ELM327 myELM327;
uint32_t rpm = 0;
uint32_t cool = 0;
void setup()
{
    DEBUG_PORT.begin(115200);
  ELM_PORT.begin("ArduHUD", true);
 tft.begin();
   tft.setRotation(3);
  tft.fillScreen(ILI9341_BLACK);
 tft.setCursor(50, 20);
  tft.setTextSize(3);
  tft.setTextColor(ILI9341_RED);
 tft.print("OPSTARTEN....");
  if (!ELM_PORT.connect(address))           
  {
    DEBUG_PORT.println("Couldn't connect to OBD scanner - Phase 1");
    while (1);
  }
  if (!myELM327.begin(ELM_PORT))
  {
    Serial.println("Couldn't connect to OBD scanner - Phase 2");
    while (1);
  }
  Serial.println("Connected to ELM327");
   tft.fillScreen(ILI9341_BLACK);
}
void loop()
{
  float tempRPM = myELM327.rpm();
    rpm = (uint32_t)tempRPM;
  tft.print(rpm);
 tft.setCursor(50, 40);
float tempcool = myELM327.engineCoolantTemp();
  cool = (uint32_t)tempcool;
  tft.print(cool);

}

I connected the elm to an android phone with torque and there i got values, so the elm looks like its working👍🏻

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