Trying to create a sketch that will allow me to change the flash rate of the built-in LED via Bluetooth LE, using the LiteBlue app on my iPad

Using Arduino Programming Questions
1

I'm using an Arduino Uno Wi-Fi R2.

#include <ArduinoBLE.h>

BLEService myserv("DE2E82B1-1A23-41B3-A74F-0ED8A0A61E68");
BLEIntCharacteristic mychar("EFDA032A-37D9-40C5-9FB5-7B476FB19970", BLERead | BLEWrite);

const int ledPin = LED_BUILTIN;
int rate;

void setup() {
  pinMode(ledPin, OUTPUT);
  BLE.begin();
  BLE.setLocalName("blank");
  BLE.setAdvertisedService(myserv);
  myserv.addCharacteristic(mychar);
  BLE.addService(myserv);
  mychar.writeValue(1000);
  BLE.advertise();
}

void loop() {
  BLEDevice central = BLE.central();

  if (central) {
    while (central.connected()) {
      mychar.readValue(rate);
      if (mychar.written()) {
        while (mychar.value()) {
          digitalWrite(ledPin, HIGH);
          delay(100);
          digitalWrite(ledPin, LOW);
          delay(rate);
        }
      }
    }
  }
}

I got to the above code by trying to simplify and repurpose the ArduinoBLE Peripheral LED example.

I am able to change the flash rate once; after that, the Arduino stops communicating with the iPad.

2

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