Bluetooth connection

Hardware UNO R4 UNO R4 WiFi
1

Everytime the arduino shows up on my phone it says i need an app to connect to it? I dont understand why and im stuck... I have also updated the firmwire for the esp32 to 2.0...

<CAN.h>
#include <ArduinoBLE.h>

// RealDash CAN frame headers
const byte RD_FRAME_HEADER[] = {0x44, 0x33, 0x22, 0x11};

//------------------------------------------------------------------------------
// Settings
#define CAN_SPEED (500E3) // Adjust this to your CAN network speed
#define SERIAL_BAUD_RATE 9600 // Adjust this to your serial communication speed

//------------------------------------------------------------------------------
// Inits, globals
typedef struct {
  long id;
  byte rtr;
  byte ide;
  byte dlc;
  byte dataArray[8]; // Adjust the size to match your CAN messages
} packet_t;

BLEService bleService("CAN Forwarder");
BLECharacteristic bleCharacteristic("CAN Data", BLERead | BLENotify, sizeof(packet_t));

//------------------------------------------------------------------------------
// Forward a CAN packet as RealDash CAN '44' frame
void forwardAsRD44Frame(packet_t *packet) {
  // RealDash '44' frame format:
  // 4 bytes - 0x44,0x33,0x22,0x11
  // 4 bytes - CAN frame id number (32bit little endian value)
  // 8 bytes - CAN frame payload (data)

  byte rd44Frame[16];
  memcpy(rd44Frame, RD_FRAME_HEADER, 4);
  memcpy(rd44Frame + 4, &packet->id, 4);
  memcpy(rd44Frame + 8, packet->dataArray, 8);

  bleCharacteristic.writeValue(rd44Frame, sizeof(rd44Frame));
}

//------------------------------------------------------------------------------
// CAN RX, TX
void onCANReceive(int packetSize) {
  // received a CAN packet
  packet_t rxPacket;
  rxPacket.id = CAN.packetId();
  rxPacket.rtr = CAN.packetRtr() ? 1 : 0;
  rxPacket.ide = CAN.packetExtended() ? 1 : 0;
  rxPacket.dlc = CAN.packetDlc();
  byte i = 0;
  while (CAN.available()) {
    rxPacket.dataArray[i++] = CAN.read();
    if (i >= (sizeof(rxPacket.dataArray) / (sizeof(rxPacket.dataArray[0])))) {
      break;
    }
  }

  // Forward the received packet as RealDash '44' frame
  forwardAsRD44Frame(&rxPacket);
}

//------------------------------------------------------------------------------
// Setup
void setup() {
  Serial.begin(SERIAL_BAUD_RATE);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  if (!CAN.begin(CAN_SPEED)) {
    Serial.println("Starting CAN failed!");
    while (1);
  }

  BLE.begin();
  BLE.setLocalName("CAN Forwarder");
  BLE.setAdvertisedService(bleService);
  bleService.addCharacteristic(bleCharacteristic);
  BLE.addService(bleService);
  BLE.advertise();

  // register the receive callback
  CAN.onReceive(onCANReceive);

  Serial.println("CAN RX TX Started");
}

//------------------------------------------------------------------------------
void loop() {
  // Empty loop; no additional tasks are needed
  BLE.poll();
}

Any ideas ?

2

Hello, can you share a screenshot of the error message you are getting and the setup you are using for the project?

3

I get a message when trying to connect o my samsung phone that i need an app to connect