#include <ArduinoBLE.h>
#define SERVICE_UUID "MY-SERVICE-UUID"
unsigned long scanStart;
bool fallbackToFullScan = false;
void setup() {
 Serial.begin(9600);
 delay(1000); // Wait for serial
 if (!BLE.begin()) {
 Serial.println("Starting BLE failed!");
 while (1);
 }
 Serial.println("Scanning by Service UUID...");
 BLE.scanForUuid(SERVICE_UUID);
 scanStart = millis();
}
void notWorkingScan() {
 BLE.stopScan();
 delay(1000);
 // This scan will not work - it will continue to behave like BLE.scanForUuid(SERVICE_UUID)
 BLE.scan();
}
void workingScan() {
 // This will reset _scanNameFilter, _scanUuidFilter, and _scanAddressFilter to ""
 BLE.scanForUuid("");
 BLE.stopScan();
 delay(1000);
 // This scan will now work
 BLE.scan();
}
void loop() {
 BLEDevice peripheral = BLE.available();
 if (peripheral) {
 Serial.println("Peripheral found!");
 BLE.stopScan();
 }
 // Wait 5 seconds to connect, then fall back to a regular scan.
 if (!fallbackToFullScan && millis() - scanStart > 5000) {
 scanStart = millis();
 Serial.println("Falling back to full scan...");
 fallbackToFullScan = true;
 // notWorkingScan();
 workingScan();
 }
}