Switching between BLE and Wi-Fi

Hello guys !

I’m doing a project that consists on detecting MAC addresses via BLE (using my Arduino as a central device), and then sending this MAC addresses to a Webserver that is created by the Arduino.

For some reason I can connect to the Wi-Fi, but upon switching to BLE the Arduino does not scan for peripheral devices.

This is my code, so far:

Udp NTP Client

Get the time from a Network Time Protocol (NTP) time server
Demonstrates use of UDP sendPacket and ReceivePacket
For more on NTP time servers and the messages needed to communicate with them,
see http://en.wikipedia.org/wiki/Network_Time_Protocol

created 4 Sep 2010
by Michael Margolis
modified 9 Apr 2012
by Tom Igoe

This code is in the public domain.


#include <SPI.h>
#include <WiFiNINA.h>
#include <WiFiUdp.h>
#include <ArduinoBLE.h>
#include "utility/wifi_drv.h"
#include "arduino_secrets.h"
int status = WL_IDLE_STATUS;

///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // your network key index number (needed only for WEP)

unsigned int localPort = 2390; // local port to listen for UDP packets

IPAddress timeServer(129, 6, 15, 28); // time.nist.gov NTP server

const int NTP_PACKET_SIZE = 48; // NTP timestamp is in the first 48 bytes of the message

byte packetBuffer[ NTP_PACKET_SIZE]; //buffer to hold incoming and outgoing packets

// A UDP instance to let us send and receive packets over UDP
WiFiUDP Udp;

void setup() {

// Open serial communications and wait for port to open:
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only



void loop() {


tempo(); // funçao que devolve o tempo

void bleInit(){

// begin initialization
if (!BLE.begin()) {
Serial.println("starting BLE failed!");

while (1);

Serial.println("BLE Central scan");

// start scanning for peripheral


void bleModeP()

// check if a peripheral has been discovered
BLEDevice peripheral = BLE.available();

if (peripheral) {
// discovered a peripheral
Serial.println("Discovered a peripheral");

// print address
Serial.print("Address: ");

// print the local name, if present
if (peripheral.hasLocalName()) {

Serial.print("Local Name: ");

// print the RSSI
Serial.print("RSSI: ");

void tempo(){

sendNTPpacket(timeServer); // send an NTP packet to a time server
// wait to see if a reply is available
if (Udp.parsePacket()) {
Serial.println("packet received");
// We've received a packet, read the data from it
Udp.read(packetBuffer, NTP_PACKET_SIZE); // read the packet into the buffer

//the timestamp starts at byte 40 of the received packet and is four bytes,
// or two words, long. First, extract the two words:

unsigned long highWord = word(packetBuffer[40], packetBuffer[41]);
unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]);
// combine the four bytes (two words) into a long integer
// this is NTP time (seconds since Jan 1 1900):
unsigned long secsSince1900 = highWord << 16 | lowWord;
Serial.print("Seconds since Jan 1 1900 = ");

// now convert NTP time into everyday time:
Serial.print("Unix time = ");
// Unix time starts on Jan 1 1970. In seconds, that's 2208988800:
const unsigned long seventyYears = 2208988800UL;
// subtract seventy years:
unsigned long epoch = secsSince1900 - seventyYears;
// print Unix time:

// print the hour, minute and second:
Serial.print("The UTC time is "); // UTC is the time at Greenwich Meridian (GMT)
Serial.print((epoch % 86400L) / 3600); // print the hour (86400 equals secs per day)
if (((epoch % 3600) / 60) < 10) {
// In the first 10 minutes of each hour, we'll want a leading '0'
Serial.print((epoch % 3600) / 60); // print the minute (3600 equals secs per minute)
if ((epoch % 60) < 10) {
// In the first 10 seconds of each minute, we'll want a leading '0'
Serial.println(epoch % 60); // print the second
// wait ten seconds before asking for the time again


// send an NTP request to the time server at the given address
unsigned long sendNTPpacket(IPAddress& address) {
// set all bytes in the buffer to 0
memset(packetBuffer, 0, NTP_PACKET_SIZE);
// Initialize values needed to form NTP request
// (see URL above for details on the packets)
packetBuffer[0] = 0b11100011; // LI, Version, Mode
packetBuffer[1] = 0; // Stratum, or type of clock
packetBuffer[2] = 6; // Polling Interval
packetBuffer[3] = 0xEC; // Peer Clock Precision
// 8 bytes of zero for Root Delay & Root Dispersion
packetBuffer[12] = 49;
packetBuffer[13] = 0x4E;
packetBuffer[14] = 49;
packetBuffer[15] = 52;


// all NTP fields have been given values, now
// you can send a packet requesting a timestamp:
Udp.beginPacket(address, 123); //NTP requests are to port 123
Udp.write(packetBuffer, NTP_PACKET_SIZE);

void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");

// print your board's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");

// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.println(" dBm");

bool switch2BleMode()

// set advertised local name and service UUID:
//BLE.setDeviceName( "Arduino Nano 33 IoT" );
//BLE.setLocalName( "Arduino Nano 33 IoT" );
return true;

bool switch2WiFiMode()


status = WL_IDLE_STATUS;

// Re-initialize the WiFi driver
// This is currently necessary to switch from BLE to WiFi

return true;

void initialSetup(){

// check for the WiFi module:
if (WiFi.status() == WL_NO_MODULE) {
Serial.println("Communication with WiFi module failed!");
// don't continue
while (true);

String fv = WiFi.firmwareVersion();
Serial.println("Please upgrade the firmware");

// attempt to connect to WiFi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);

// wait 10 seconds for connection:

Serial.println("Connected to WiFi");

Serial.println("\nStarting connection to server...");

Can someone tell me what I’m doing wrong ?
I’ve used this code https://forum.arduino.cc/index.php?topic=657710.0, aswell as some of the examples available on the Arduino library.
Thank you for the help.

Can someone tell me what I'm doing wrong ?

Please have a look at the example in reply #6 in https://forum.arduino.cc/index.php?topic=657710.0.

You should not have any WiFi or BLE code in setup(). setup() is only run once when you power up or reset the board. When you switch you need to stop BLE or WiFi and then start BLE or WiFi.

The example shows you exactly what you need to do. Try to understand it first. You removed important functionality from the functions I wrote, without replacing it with something equal or better.

Additional hint: Try Tools -> Auto Format to format your code. Your code indentation is not good.

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