#include <ArduinoBLE.h>

// Advertising parameters should have a global scope. Do NOT define them in 'setup' or in 'loop'
const uint8_t manufactData[4] = {0};
const uint8_t manufactDataLong[30] = {0};

void setup() 
{
  Serial.begin(9600);
  while (!Serial);

  if (!BLE.begin()) {
    Serial.println("failed to initialize BLE!");
    while (1);
  }

  bool success = BLE.setLocalName("Test advertising return type");
  if (!success) { Serial.println("Failed to set parameter, not enough space available"); }

  // Try to set a too long manufacturer data
  success = BLE.setManufacturerData(0x004C, manufactDataLong, sizeof(manufactDataLong));
  if (!success) { Serial.println("Failed to set parameter, not enough space available"); }
  // Set a shorter manufacturer data
  success = BLE.setManufacturerData(0x004C, manufactData, sizeof(manufactData));
  if (!success) { Serial.println("Failed to set parameter, not enough space available"); }

  BLE.advertise();
  Serial.println("advertising ...");
}

void loop() 
{
  BLE.poll();
}

#include <ArduinoBLE.h>

// Advertising parameters should have a global scope. Do NOT define them in 'setup' or in 'loop'
const uint8_t manufactData[4] = {0};
const uint8_t manufactDataLong[30] = {0};

void setup() 
{
  Serial.begin(9600);
  while (!Serial);

  if (!BLE.begin()) {
    Serial.println("failed to initialize BLE!");
    while (1);
  }

  // Build scan response data packet
  BLEAdvertisingData scanData;
  bool success = scanData.setLocalName("Test advertising return type");
  if (!success) { Serial.println("Failed to set parameter, not enough space available"); }
  BLE.setScanResponseData(scanData);

  // Build advertising data packet
  BLEAdvertisingData advData;
  // Try to set a too long manufacturer data
  success = advData.setManufacturerData(0x004C, manufactDataLong, sizeof(manufactDataLong));
  if (!success) { Serial.println("Failed to set parameter, not enough space available"); }
  // Set a shorter manufacturer data
  success = advData.setManufacturerData(0x004C, manufactData, sizeof(manufactData));
  if (!success) { Serial.println("Failed to set parameter, not enough space available"); }
  BLE.setAdvertisingData(advData);

  BLE.advertise();
  Serial.println("advertising ...");
}

void loop() 
{
  BLE.poll();
}