ESP32 Forum

Code: Select all

#include "BluetoothSerial.h"                                                              // BT: Include the Serial bluetooth library
#define LED_BT_BLUE 2                                                                     // BT: Internal LED (or LED on the pin D2) for the connection indication (connected LED ON / disconnected LED OFF)
#define LED_BT_RED 15                                                                     // BT: LED (LED on the pin D4) for the connection indication (connected LED OFF / disconnected LED ON)
unsigned long previousMillisReconnect;                                                    // BT: Variable used for comparing millis counter for the reconnection timer
bool ledBtState = false;                                                                  // BT: Variable used to chage the indication LED state
bool SlaveConnected;                                                                      // BT: Variable used to store the current connection state (true=connected/false=disconnected)
int recatt = 0;                                                                           // BT: Variable used to count the reconnection attempts

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

String myName = "ESP32-BT-Master";                                                        // BT: Variable used to store the SERVER(Master) bluetooth device name; just for prinitng
String slaveName = "ESP32-BT-Slave";                                                      // BT: Variable used to store the CLIENT(Slave) bluetooth device name; just for prinitng; just for printing in this case
String MACadd = "03:B4:16:72:36:9C";                                                      // BT: Variable used to store the CLIENT(Slave) bluetooth device Mac address; just for prinitng; just for printing in this case
uint8_t address[6] = { 0x03, 0xB4, 0x16, 0x72, 0x36, 0x9C };                              // BT: Variable used to store the CLIENT(Slave) MAC address used for the connection; Use your own andress in the same format

BluetoothSerial SerialBT;                                                                 // BT: Set the Object SerialBT


// BT: Bt_Status callback function
void Bt_Status(esp_spp_cb_event_t event, esp_spp_cb_param_t *param) {
  if (event == ESP_SPP_OPEN_EVT) {                                                        // BT: Checks if the SPP connection is open, the event comes// event == Client connected
    Serial.println ("Client Connected");                                                  // BT: Write to the serial monitor
    digitalWrite (LED_BT_BLUE, HIGH);                                                     // BT: Turn ON the BLUE bluetooth indication LED (solid light)
    digitalWrite (LED_BT_RED, LOW);                                                       // BT: Turn OFF the RED bluetooth indication LED
    SlaveConnected = true;                                                                // BT: Set the variable true = CLIENT is connected to the SERVER
    recatt = 0;                                                                           // BT: Reset the reconnect attempts counter
  }
  else if (event == ESP_SPP_CLOSE_EVT) {                                                  // BT: event == Client disconnected
    Serial.println("Client Disconnected");                                                // BT: Write to the serial monitor
    digitalWrite(LED_BT_RED, HIGH);                                                       // BT: Turn ON the RED bluetooth indication LED (solid light)
    digitalWrite(LED_BT_BLUE, LOW);                                                       // BT: Turn OFF the BLUE bluetooth indication LED
    SlaveConnected = false;                                                               // BT: Set the variable false = CLIENT connection lost
  }
}

void setup() {
  pinMode(LED_BT_BLUE, OUTPUT);                                                           // BT: Set up the onboard LED pin as output
  pinMode(LED_BT_RED, OUTPUT);                                                            // BT: Set up the onboard LED pin as output
  digitalWrite(LED_BT_RED, HIGH);                                                         // BT: Turn ON the RED LED = no connection established
  SlaveConnected = false;                                                                 // BT: Set the variable false = CLIENT is not connected
  Serial.begin(115200);                                                                   // Sets the data rate in bits per second (baud) for serial data transmission
  
  // BT: Define the Bt_Status callback
  SerialBT.register_callback(Bt_Status);
  // BT: Starts the bluetooth device with the name stored in the myName variable as SERVER(Master)
  SerialBT.begin(myName, true);
  Serial.printf("The device \"%s\" started in master mode, make sure slave BT device is on!\n", myName.c_str());
  SlaveConnect();                                                                         // BT: Calls the bluetooth connection function to cnnect to the CLIENT(Slave)
}

void SlaveConnect() {                                                                     // BT: This function connects/reconnects to the CLIENT(Slave)
  Serial.println("Function BT connection executed");                                      // BT: Write to the serial monitor
  Serial.printf("Connecting to slave BT device named \"%s\" and MAC address \"%s\" is started.\n", slaveName.c_str(), MACadd.c_str());  // BT: Write to the serial monitor
  SerialBT.connect(address);                                                              // BT: Establishing the connection with the CLIENT(Slave) with the Mac address stored in the address variable
}

void loop() {
  
  if (!SlaveConnected) {                                                                  // BT: Condition to evalute if the connection is established/lost 
    if (millis() - previousMillisReconnect >= 10000) {                                    // BT: Check that 10000ms is passed
      previousMillisReconnect = millis();                                                 // BT: Set previousMillisReconnect to current millis
      recatt++;                                                                           // BT: Increase the the reconnection attempts counter +1 
      Serial.print("Trying to reconnect. Attempt No.: ");                                 // BT: Write to the serial monitor
      Serial.println(recatt);                                                             // BT: Write the attempts count to the serial monitor
      Serial.println("Stopping Bluetooth...");                                            // BT: Write to the serial monitor
      SerialBT.end();                                                                     // BT: Close the bluetooth device
      Serial.println("Bluetooth stopped !");                                              // BT: Write to the serial monitor
      Serial.println("Starting Bluetooth...");                                            // BT: Write to the serial monitor
      SerialBT.begin(myName, true);                                                       // BT: Starts the bluetooth device with the name stored in the myName variable as SERVER(Master)
      Serial.printf("The device \"%s\" started in master mode, make sure slave BT device is on!\n", myName.c_str());
      SlaveConnect();                                                                     // BT: Calls the bluetooth connection function to cnnect to the CLIENT(Slave)
    }
    
  }
  // BT: Data send/receive via bluetooth
  if (Serial.available()) {                                                               // BT: Checks if there are data from the serial monitor available
    SerialBT.write(Serial.read());                                                        // BT: Sends the data via bluetooth
  }
  if (SerialBT.available()) {                                                             // BT: Checks if there are data from the bluetooth available
    Serial.write(SerialBT.read());                                                        // BT: Write the data to the serial monitor
  }
}

Code: Select all

#include "BluetoothSerial.h"                                                  // BT: Include the Serial bluetooth library 
#define LED_BT 2                                                              // BT: Internal LED (or LED on the pin D2) for the connection indication (connected solid/disconnected blinking)
unsigned long previousMillis;                                                 // BT: Variable used for comparing millis counter (LED blinking)
bool ledBtState = false;                                                      // BT: Variable used to chage the indication LED state
bool MasterConnected;                                                         // BT: Variable used to store the current connection state (true=connected/false=disconnected)
String device_name = "ESP32-BT-Slave";                                        // BT: Variable used to store the CLIENT(slave) bluetooth device name
String MACadd = "03:B4:16:72:36:9C";                                          // BT: Variable used to store the CLIENT(slave) bluetooth Mac address; Use your own MAC address

// BT: Bluetooth availabilty check
#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)                           
#error Bluetooth is not enabled! Please run make menuconfig to and enable it
#endif
// BT: Serial Bluetooth availabilty check
#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;                                                     // BT: Set the Object SerialBT

// BT: Bt_Status callback function
void Bt_Status (esp_spp_cb_event_t event, esp_spp_cb_param_t *param) {

  if (event == ESP_SPP_SRV_OPEN_EVT) {                                        // BT: Checks if the SPP Server connection is open, the event comes 
    Serial.println ("Client Connected");                                      // BT: Write to the serial monitor
    digitalWrite (LED_BT, HIGH);                                              // BT: Turn ON the bluetooth indication LED (solid light)
    MasterConnected = true;                                                   // BT: Set the variable true = SERVER is connected to the CLIENT
  }
  else if (event == ESP_SPP_CLOSE_EVT ) {                                     // BT: Checks if the SPP connection is closed, the event comes
    Serial.println ("Client Disconnected");                                   // BT: Write to the serial monitor
    digitalWrite (LED_BT, LOW);                                               // BT: Turn OFF the bluetooth indication LED
    MasterConnected = false;                                                  // BT: Set the variable false = SERVER connection lost
  }
}

void setup() {
  pinMode(LED_BT,OUTPUT);                                                     // BT: Set up the onboard LED pin as output
  Serial.begin(115200);                                                       // Sets the data rate in bits per second (baud) for serial data transmission
  
  // BT: Define the Bt_Status callback
  SerialBT.register_callback (Bt_Status);
  // BT: Starts the bluetooth device with the name stored in the device_name variable
  SerialBT.begin(device_name);
  Serial.printf("The device with name \"%s\" and MAC address \"%s\" is started.\nNow you can pair it with Bluetooth!\n", device_name.c_str(), MACadd.c_str());
}

void loop() {
  // BT: Blinking the bluetooth indication LED if the connection is not established
  if (!MasterConnected) {
    if (millis() - previousMillis >= 500) {                                     // BT: Checks if 500ms is passed
      if (ledBtState == false) {                                                // BT: Checks the leddState and toggles it 
      ledBtState = true;
    }
    else {
      ledBtState = false;
    }
    digitalWrite(LED_BT, ledBtState);                                             // BT: Set LED ON/OFF based onthe ledBtState variable
    previousMillis = millis();                                                    // BT: Set previousMillis to current millis
    }
    
  }
  // BT: Data send/receive via bluetooth
  if (Serial.available()) {                                                       // BT: Checks if there are data from the serial monitor available
    SerialBT.write(Serial.read());                                                // BT: Sends the data via bluetooth
  }
  if (SerialBT.available()) {                                                     // BT: Checks if there are data from the bluetooth available
    Serial.write(SerialBT.read());                                                // BT: Write the data to the serial monitor
  }
}

Code: Select all

C:/Users/konec/ESP-IDF/bt_spp_initiator/bt_spp_initiator/main/main.c:22:10: fatal error: console_uart.h: No such file or directory
   22 | #include "console_uart.h"
      |          ^~~~~~~~~~~~~~~~
compilation terminated.
[1113/1119] Linking C static library esp-idf\wifi_provisioning\libwifi_provisioning.a
ninja: build stopped: subcommand failed.

 *  The terminal process "C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -Command ninja " terminated with exit code: 1.