ESP32C3 Bluetooth Example Code not working

[BFree42]

I am a complete noob so I apologize if this is a dumb question! I have a Xiao ESP32C3. I’m trying to get started learning to use the Bluetooth functions.

What is the exact name of the library I need to use to run the Bluetooth example codes here (https://wiki.seeedstudio.com/XIAO_ESP32C3_Bluetooth_Usage/)

It won’t compile in the online Arduino Editor. I always get an error saying: ringbuf_type_t has not been declared

From the error output the problem seems to be that multiple libraries were found for “BLEDevice.h”

Here’s the last few lines of output I get:

Multiple libraries were found for “BLEDevice.h”

Used: /home/builder/opt/libraries/arduinoble_1_3_6

Not used: /home/builder/opt/libraries/esp32_ble_arduino_1_0_1

Not used: /home/builder/opt/libraries/bleperipheral_0_4_0

Not used: /home/builder/opt/libraries/seeed_arduino_rpcble_1_0_0

Not used: /home/builder/opt/libraries/stm32duinoble_1_2_5

Not used: /home/builder/.arduino15/packages/esp32/hardware/esp32/2.0.5/libraries/BLE

Multiple libraries were found for “BLEUtils.h”

Used: /home/builder/opt/libraries/esp32_ble_arduino_1_0_1

Not used: /home/builder/.arduino15/packages/esp32/hardware/esp32/2.0.5/libraries/BLE

Error during build: exit status 1

Which library is the correct one to use?

Thank you!!!

[cgwaltney]

do you have the XIAO ESP32C3 board selected in the Arduino IDE?

[BFree42]

Yes

[msfujino]

For the first sample, try this.

void loop() {
  // put your main code here, to run repeatedly:
//  BLEScanResults foundDevices = pBLEScan->start(scanTime, false);
  BLEScanResults *foundDevices = pBLEScan->start(scanTime, false);  
  Serial.print("Devices found: ");
//  Serial.println(foundDevices.getCount());
  Serial.println(foundDevices->getCount());
  Serial.println("Scan done!");
  pBLEScan->clearResults();   // delete results fromBLEScan buffer to release memory
  delay(2000);
}

For the second sample, try this.

//      std::string value = pCharacteristic->getValue();
      String value = pCharacteristic->getValue();

[BFree42]

I’ve tried commenting out the includes at the beginning, but then I get a completely different error I don’t know what to do with.

/usr/local/bin/arduino-cli compile --fqbn esp32:esp32:XIAO_ESP32C3:CDCOnBoot=default,CPUFreq=160,DebugLevel=none,EraseFlash=none,FlashFreq=80,FlashMode=qio,FlashSize=4M,PartitionScheme=default,UploadSpeed=921600 --build-cache-path /tmp --output-dir /tmp/829461094/build --build-path /tmp/arduino-build-FE3D5490E5CF9C92416316CF44A15618 --library /mnt/create-efs/webide/bc/56/bc562b2744b6180fc883d8139f02552e:bfree42/libraries_v2/Adafruit GFX Library --library /mnt/create-efs/webide/bc/56/bc562b2744b6180fc883d8139f02552e:bfree42/libraries_v2/Adafruit PCD8544 Nokia 5110 LCD library --library /mnt/create-efs/webide/bc/56/bc562b2744b6180fc883d8139f02552e:bfree42/libraries_v2/DualG2HighPowerMotorShield --library /mnt/create-efs/webide/bc/56/bc562b2744b6180fc883d8139f02552e:bfree42/libraries_v2/SdFat --library /mnt/create-efs/webide/bc/56/bc562b2744b6180fc883d8139f02552e:bfree42/libraries_v2/SerialPort --library /mnt/create-efs/webide/bc/56/bc562b2744b6180fc883d8139f02552e:bfree42/libraries_v2/SparkFun MPL3115A2 Altitude and Pressure Sensor Breakout --library /home/builder/opt/libraries/esp32_ble_arduino_1_0_1 /tmp/829461094/Bluetooth_Server_Example_fromSeeed

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:12:54: error: expected class-name before ‘{’ token

class MyCallbacks: public BLECharacteristicCallbacks {

^

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:13:18: error: ‘BLECharacteristic’ has not been declared

void onWrite(BLECharacteristic *pCharacteristic) {

^~~~~~~~~~~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino: In member function ‘void MyCallbacks::onWrite(int*)’:

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:14:44: error: request for member ‘getValue’ in ‘* pCharacteristic’, which is of non-class type ‘int’

std::string value = pCharacteristic->getValue();

^~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:24:8: error: ‘uy777777777777fg55555’ was not declared in this scope

}uy777777777777fg55555

^~~~~~~~~~~~~~~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino: In function ‘void setup()’:

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:31:3: error: ‘BLEDevice’ has not been declared

BLEDevice::init(“MyESP32”);

^~~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:32:3: error: ‘BLEServer’ was not declared in this scope

BLEServer *pServer = BLEDevice::createServer();

^~~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:32:3: note: suggested alternative: ‘Server’

BLEServer *pServer = BLEDevice::createServer();

^~~~~~~~~

Server

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:32:14: error: ‘pServer’ was not declared in this scope

BLEServer *pServer = BLEDevice::createServer();

^~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:32:14: note: suggested alternative: ‘Server’

BLEServer *pServer = BLEDevice::createServer();

^~~~~~~

Server

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:32:24: error: ‘BLEDevice’ has not been declared

BLEServer *pServer = BLEDevice::createServer();

^~~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:34:3: error: ‘BLEService’ was not declared in this scope

BLEService *pService = pServer->createService(SERVICE_UUID);

^~~~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:34:15: error: ‘pService’ was not declared in this scope

BLEService *pService = pServer->createService(SERVICE_UUID);

^~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:34:15: note: suggested alternative: ‘Serial’

BLEService *pService = pServer->createService(SERVICE_UUID);

^~~~~~~~

Serial

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:36:3: error: ‘BLECharacteristic’ was not declared in this scope

BLECharacteristic *pCharacteristic = pService->createCharacteristic(

^~~~~~~~~~~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:36:3: note: suggested alternative: ‘Character_h’

BLECharacteristic *pCharacteristic = pService->createCharacteristic(

^~~~~~~~~~~~~~~~~

Character_h

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:36:22: error: ‘pCharacteristic’ was not declared in this scope

BLECharacteristic *pCharacteristic = pService->createCharacteristic(

^~~~~~~~~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:36:22: note: suggested alternative: ‘Character_h’

BLECharacteristic *pCharacteristic = pService->createCharacteristic(

^~~~~~~~~~~~~~~

Character_h

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:38:42: error: ‘BLECharacteristic’ is not a class, namespace, or enumeration

BLECharacteristic::PROPERTY_READ |

^~~~~~~~~~~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:39:42: error: ‘BLECharacteristic’ is not a class, namespace, or enumeration

BLECharacteristic::PROPERTY_WRITE

^~~~~~~~~~~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:47:3: error: ‘BLEAdvertising’ was not declared in this scope

BLEAdvertising *pAdvertising = pServer->getAdvertising();

^~~~~~~~~~~~~~

/tmp/829461094/Bluetooth_Server_Example_fromSeeed/Bluetooth_Server_Example_fromSeeed.ino:47:19: error: ‘pAdvertising’ was not declared in this scope

BLEAdvertising *pAdvertising = pServer->getAdvertising();

^~~~~~~~~~~~

Error during build: exit status 1

[BFree42]

I swapped out the example loop() for the one you sent. I’m afraid the result is no different.

‘ringbuf_type_t’ has not been declared

Multiple libraries were found for “BLEDevice.h”

Used: /home/builder/opt/libraries/arduinoble_1_3_6

Not used: /home/builder/opt/libraries/bleperipheral_0_4_0

Not used: /home/builder/opt/libraries/seeed_arduino_rpcble_1_0_0

Not used: /home/builder/opt/libraries/esp32_ble_arduino_1_0_1

Not used: /home/builder/opt/libraries/stm32duinoble_1_2_5

Not used: /home/builder/.arduino15/packages/esp32/hardware/esp32/2.0.5/libraries/BLE

Multiple libraries were found for “BLEUtils.h”

Used: /home/builder/opt/libraries/esp32_ble_arduino_1_0_1

Not used: /home/builder/.arduino15/packages/esp32/hardware/esp32/2.0.5/libraries/BLE

Error during build: exit status 1

[msfujino]

In my environment, I get a compile error if the ArduinoBLE library is installed.

[BFree42]

Is there a different library that should be installed? I tried commenting out the include lines but then I get this error with the code you gave me.

[msfujino]

In my experience, “arduinoble_1_3_6” seems to conflict with the ESP32 BLE library.
Since you don’t need ArduinoBLE, why don’t you remove “/home/builder/opt/libraries/arduinoble_1_3_6”?