ESP32 Bluetooth w/ HC-05

Projects Networking, Protocols, and Devices
20

When connected to an android device, we received the address of the hc-05 to be 00:14:03:05:0c:38. The address of our esp32 is A8:42:E3:D8:95:E2. The HC-05 is configured with the following AT commands:
-ROLE: 0
-CMODE: 1
-PSWRD: 1234
-UART: 38400,0,0

With the HC-05 in slave mode, and the esp32 in master mode, we uploaded the SoftwareSerial code below to the HC-05 and the BluetoothSerial code below to the esp32. After the slave code is uploaded to the Arduino with the HC-05, the module blinks at a slow rate of once per second. We are able to connect to the HC-05 with a phone or pc and we are also able to connect to the ESP32 with a phone or pc, but the esp32 won't connect to the HC-05 directly with the uploaded code. We are not sure how to proceed.

HC-05 Slave Code:

#include <SoftwareSerial.h>

SoftwareSerial BTSerial(2,3); // RX, TX pins of HC-05

void setup() {
  Serial.begin(38400);
  BTSerial.begin(38400);
}

void loop() {
  if (BTSerial.available()) {
    char data = BTSerial.read();
    Serial.print("Received from ESP32: ");
    Serial.println(data);
  }

  if (Serial.available()) {
    char data = Serial.read();
    BTSerial.print(data);
  }
}

ESP32 Master Code:

#include "BluetoothSerial.h"

#define Slave_Name "H-C-2010-06-01"
#define MACadd "00:14:03:05:0C:38"
uint8_t address[6] {0x00, 0x14, 0x03, 0x05, 0x0C, 0x38};
const char *pin = "1234";

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

BluetoothSerial SerialBT;

String myName = "ESP32-BT-Master";

void setup() {
  bool connected;
  Serial.begin(38400);

  SerialBT.begin(myName, true);
  Serial.print("The device started in master mode, make sure slave BT device is on!\n");

  SerialBT.setPin(pin);
  Serial.println("Using PIN");

  connected = SerialBT.connect(address);
  Serial.print("Connecting to slave BT device with MAC "); 
  Serial.println(MACadd);


  if(connected) {
    Serial.println("Connected Successfully!");
  } else {
    while(!SerialBT.connected(10000)) {
      Serial.println("Failed to connect. Make sure remote device is available and in range, then restart app.");
    }
  }

  // Disconnect() may take up to 10 secs max
  if (SerialBT.disconnect()) {
    Serial.println("Disconnected Successfully!");
  }
  // This would reconnect to the slaveName(will use address, if resolved) or address used with connect(slaveName/address).
  SerialBT.connect();
  if(connected) {
    Serial.println("Reconnected Successfully!");
  } else {
    while(!SerialBT.connected(10000)) {
      Serial.println("Failed to reconnect. Make sure remote device is available and in range, then restart app.");
    }
  }
}

void loop() {
  if (Serial.available()) {
    SerialBT.write(Serial.read());
  }
  if (SerialBT.available()) {
    Serial.write(SerialBT.read());
  }
  delay(20);
}