#include <ArduinoBLE.h>

BLEService testService("12345678-1234-1234-1234-1234567890ab");
BLEByteCharacteristic testChar(
  "87654321-4321-4321-4321-ba0987654321",
  BLERead | BLENotify
);

uint8_t counter = 1;
unsigned long lastSend = 0;

void setup() {
  Serial.begin(115200);

  BLE.begin();
  BLE.setLocalName("NiclaBLETest");
  BLE.setAdvertisedService(testService);

  testService.addCharacteristic(testChar);
  BLE.addService(testService);

  testChar.writeValue((byte)0x00);

  BLE.advertise();
  Serial.println("BLE Test Advertised");
}

void loop() {
  BLE.poll();

  BLEDevice central = BLE.central();
  if (!central || !central.connected()) return;

  if (millis() - lastSend > 1000) {
    lastSend = millis();
    testChar.writeValue(counter);
    Serial.print("Sent: 0x");
    Serial.println(counter, HEX);
    counter++;
  }
}