Import WiFiNINA WiFiUdpNtpClient example

from https://github.com/arduino-libraries/WiFiNINA/tree/master/examples/WiFiUdpNtpClient

Author: sandeepmistry

examples/WiFiUdpNtpClient/WiFiUdpNtpClient.ino

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+/*
+ 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>
+
+int status = WL_IDLE_STATUS;
+#include "arduino_secrets.h" 
+///////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:
+  Serial.begin(9600);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+  // 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();
+  if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
+    Serial.println("Please upgrade the firmware");
+  }
+
+  // attempt to connect to WiFi network:
+  while (status != WL_CONNECTED) {
+    Serial.print("Attempting to connect to SSID: ");
+    Serial.println(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:
+    delay(10000);
+  }
+
+  Serial.println("Connected to WiFi");
+  printWifiStatus();
+
+  Serial.println("\nStarting connection to server...");
+  Udp.begin(localPort);
+}
+
+void loop() {
+  sendNTPpacket(timeServer); // send an NTP packet to a time server
+  // wait to see if a reply is available
+  delay(1000);
+  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 = ");
+    Serial.println(secsSince1900);
+
+    // 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:
+    Serial.println(epoch);
+
+
+    // 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)
+    Serial.print(':');
+    if (((epoch % 3600) / 60) < 10) {
+      // In the first 10 minutes of each hour, we'll want a leading '0'
+      Serial.print('0');
+    }
+    Serial.print((epoch  % 3600) / 60); // print the minute (3600 equals secs per minute)
+    Serial.print(':');
+    if ((epoch % 60) < 10) {
+      // In the first 10 seconds of each minute, we'll want a leading '0'
+      Serial.print('0');
+    }
+    Serial.println(epoch % 60); // print the second
+  }
+  // wait ten seconds before asking for the time again
+  delay(10000);
+}
+
+// send an NTP request to the time server at the given address
+unsigned long sendNTPpacket(IPAddress& address) {
+  //Serial.println("1");
+  // 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)
+  //Serial.println("2");
+  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;
+
+  //Serial.println("3");
+
+  // 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
+  //Serial.println("4");
+  Udp.write(packetBuffer, NTP_PACKET_SIZE);
+  //Serial.println("5");
+  Udp.endPacket();
+  //Serial.println("6");
+}
+
+
+void printWifiStatus() {
+  // print the SSID of the network you're attached to:
+  Serial.print("SSID: ");
+  Serial.println(WiFi.SSID());
+
+  // print your board's IP address:
+  IPAddress ip = WiFi.localIP();
+  Serial.print("IP Address: ");
+  Serial.println(ip);
+
+  // print the received signal strength:
+  long rssi = WiFi.RSSI();
+  Serial.print("signal strength (RSSI):");
+  Serial.print(rssi);
+  Serial.println(" dBm");
+}

examples/WiFiUdpNtpClient/arduino_secrets.h

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+#define SECRET_SSID ""
+#define SECRET_PASS ""