ESP32-C6 Bluetooth scanner example

Products & Technology XIAO
#1

I am trying to follow this page Bluetooth Usage | Seeed Studio Wiki to make bluetooth work with my Xiao ESP32-C6. The very first example of the page, bluetooth scanner, already does not compile and gives the error: “‘init’ is not a member of ‘BLEDevice’”.

I guess this is because I have not added the required libraries to the Arduino IDE. The page does not state which are nor where are the required libraries. Can someone point it to me?

#2

See File–>Examples–>BLE–>Scan
and 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(10000);
}
#3

Hi there,
I get that error if I have ArduinoBLE LIB on the system , if I uninstall it the error goes away and it compiles and runs Perfectly.
HTH
GL :slight_smile: PJ

Latest BSP 3.0.4 is what I tested with,
Here is the serial output from scanning:

Advertised Device: Name: iTrack, Address: d2:b1:90:70:38:6d, manufacturer data: 4b4d326d387090b1d264, serviceUUID: 00001802-0000-1000-8000-00805f9b34fb, rssi: -73 
Advertised Device: Name: , Address: 74:d1:13:9f:95:ac, manufacturer data: 4c000719010f2002f98f01000440563b9e1f74a3de0533a8a056e67de4, rssi: -10 
Devices found: 6
Scan done!
Advertised Device: Name: , Address: 44:19:3c:1c:59:84, serviceUUID: 0000fef3-0000-1000-8000-00805f9b34fb, rssi: -76, serviceData: J#6LA52�8�E�v�f��}�-��l�T 
Advertised Device: Name: , Address: 40:b8:9a:7c:74:32, manufacturer data: 2d01020001107f00ec1e26c14a308ed77030f97b63ef982a6793f8a5, rssi: -93 
Advertised Device: Name: , Address: 4c:7f:05:0c:51:43, serviceUUID: 0000fef3-0000-1000-8000-00805f9b34fb, rssi: -92, serviceData: J#YLBT2��]��#���{g�9 
Advertised Device: Name: iTrack, Address: d2:b1:90:70:38:6d, manufacturer data: 4b4d326d387090b1d264, serviceUUID: 00001802-0000-1000-8000-00805f9b34fb, rssi: -85 
Advertised Device: Name: , Address: 6d:9a:85:dd:c9:93, manufacturer data: 4c001006731d2f437d80, txPower: 12, rssi: -97 
Advertised Device: Name: iTrack, Address: c5:dd:b0:ac:6b:51, manufacturer data: 4b4d32516bacb0ddc577, serviceUUID: 00001802-0000-1000-8000-00805f9b34fb, rssi: -68 
Advertised Device: Name: , Address: f6:a8:3c:14:6e:f5, manufacturer data: 4c0012020003, rssi: -98 
Advertised Device: Name: , Address: 74:d1:13:9f:95:ac, manufacturer data: 4c000719010f2002f98f01000440563b9e1f74a3de0533a8a056e67de4, rssi: -10 
Advertised Dev

:+1:

#4

Hi there,
I like this for compactness,
Uses a vector to store the info if it has a name, other wise it’s skipped.
here is the code,

#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEScan.h>
#include <BLEAdvertisedDevice.h>
#include <vector>
#include <algorithm>

// Struct to store BLE device name and RSSI
struct BLEDeviceInfo {
  String deviceName;
  int rssi;
};

// Vector to store devices
std::vector<BLEDeviceInfo> devices;

// Scan time in seconds
int scanTime = 30;
BLEScan *pBLEScan;

// Custom callback class to handle found devices
class MyAdvertisedDeviceCallbacks : public BLEAdvertisedDeviceCallbacks {
  void onResult(BLEAdvertisedDevice advertisedDevice) {
    if (advertisedDevice.haveName()) {  // Only store if the device has a name
      BLEDeviceInfo dev;
      dev.deviceName = advertisedDevice.getName().c_str();
      dev.rssi = advertisedDevice.getRSSI();
      devices.push_back(dev);  // Store device name and RSSI in vector
    }
  }
};

void setup() {
  Serial.begin(9600);
  delay (2000);
   Serial.println();
  Serial.println("Power ON \n ");  // Let's BEGIN!!
  Serial.println("Test program compiled on " __DATE__ " at " __TIME__);
  Serial.println();
  Serial.println("Processor came out of reset.");
  Serial.println("Scanning...");

  BLEDevice::init("");
  pBLEScan = BLEDevice::getScan();  // Create new scan
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setActiveScan(true);    // Active scan uses more power, but gets results faster
  pBLEScan->setInterval(100);
  pBLEScan->setWindow(99);          // Less or equal to setInterval value
}

void loop() {
  // Clear devices vector
  devices.clear();

  // Start BLE scan
  pBLEScan->start(scanTime, false);

  // Sort devices by RSSI in descending order
  std::sort(devices.begin(), devices.end(), [](const BLEDeviceInfo &a, const BLEDeviceInfo &b) {
    return a.rssi > b.rssi;
  });

  // Print sorted devices with names and RSSI
  Serial.println("Devices found (sorted by RSSI):");
  for (const auto &device : devices) {
    Serial.printf("Device Name: %s, RSSI: %d\n", device.deviceName.c_str(), device.rssi);
  }

  Serial.println("Scan done!");
  pBLEScan->clearResults();  // Clear results from the BLE scan buffer to release memory

  delay(2000);
}

and her is the output,

Power ON 
 
Test program compiled on Sep 19 2024 at 00:47:46

Processor came out of reset.
Scanning...
Devices found (sorted by RSSI):
Device Name: iTrack, RSSI: -65
Device Name: iTrack, RSSI: -68
Scan done!

HTH
GL :slight_smile: PJ :v:

FQBN: esp32:esp32:XIAO_ESP32C6
Using board ‘XIAO_ESP32C6’ from platform in folder: C:\Users\Dude\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.0.4
Using core ‘esp32’ from platform in folder: C:\Users\Dude\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.0.4

#5

Guys, this → “See File–>Examples–>BLE–>Scan” is the second step. I want to know the first step, which library I have to install, and where to find it?

#6

Have you seen the link below?

‘Getting Started with Seeed Studio XIAO ESP32C6 | Seeed Studio Wiki’
Section “Software Preparation”

#7

Sorry but that is not the problem. I have followed the guide you posted and am able to compile and run every example. My question is where (and which) to find the bluetooth library?

#8

Hi there, Which is it? I showed you why the “init” error. The BLE libraries are in the boards file unless you want something like NIMBLE or a different stack or SD.
look at the compiler output and see what it is showing you as far as a path goes.
GL :slight_smile: PJ :v:

#9

Is this the information you need to know?
C:\Users\username\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.0.2\libraries\BLE