Trying to retrieve UUID from a BLE device

Projects Programming
1

I'm not lazy, just the opposite. I try to do my own research, but there are very few examples on this forum and on the internet referencing the retrieval of the UUID from a BLE device. I want the 32 byte UUID, not the 4 byte one.

Here is my sketch:

#include <BLEAdvertisedDevice.h>
#include <BLEDevice.h>
#include <BLEScan.h>
#include "BLEUtils.h"
#include "sdkconfig.h"
#include <sstream>
#include "BLEAdvertisedDevice.h"
#include "BLEUtils.h"
#include "esp32-hal-log.h"

const int PIN = 4;
const int CUTOFF = -60;

void setup() {
  pinMode(PIN, OUTPUT);
  BLEDevice::init("");
  int first = 100;
  int second = 200;
  Serial.begin(9600);
  Serial.println(first);
  Serial.println(second);
}

void loop() {
  BLEScan *scan = BLEDevice::getScan();
  scan->setActiveScan(true);
  BLEScanResults results = scan->start(1);
  int best = CUTOFF;
  for (int i = 0; i < results.getCount(); i++) {
    BLEAdvertisedDevice device = results.getDevice(i);
    int rssi = device.getRSSI();
    if (rssi > best) {
      best = rssi;
    }
  }
  digitalWrite(PIN, best > CUTOFF ? HIGH : LOW);
  if (PIN, best > CUTOFF) {
 BLEUUID BLEAdvertisedDevice::getServiceUUID() ;
  digitalWrite(PIN, LOW);
  delay(10000);
  }
}

When compiling, the sketch stops at: BLEUUID BLEAdvertisedDevice::getServiceUUID(); with this error message:
exit status 1
qualified-id in declaration before '(' token

2

First, BLE extended UUID contains 16 bytes (128 bits) , not 32 bytes

About your code - please edit your message and insert code in code tags.

Then go to File->Preferences in Arduino IDE and set ON to the option "Output detailed information during compilation" (or something like).
Compile your code again and show detailed error diagnostics.

3

Thank You b707 for your response. I'm a noob and still trying to learn and I appreciate your patience with me. I did what you said and put my code in code tags. However, when I turned on "verbose" in the preferences tab and compiled my program and copied all of the compiling info, the forum system told me that I went substantially over the limit of characters that are allow to be on a post. You are right, the UUID is 16 bytes. The last 16 bytes is the alias and name.

4

I found my solution and even the complete code to accomplish my goal and finish my project. Wonderful video produced by TECHIESMS STUDIO. Unlock Door using BLE keychain,Earpods,Smart Watch etc.. | BLE Beacon | Smart Lock - YouTube The developer provides a link to his code on his website: https://techiesms.com/unlock-your-door-using-airpods-smart-watch-or-smart-keychain/ and also via a link on the YouTube video.

5

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