first commit

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:heltec_wifi_lora_32_V2]
+platform = espressif32
+board = heltec_wifi_lora_32_V2
+framework = arduino
+monitor_speed = 115200
+lib_deps = 
+	paulstoffregen/Time@^1.6.1
+	arduino-libraries/Ethernet@^2.0.2

src/main.cpp

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+#include <Arduino.h>
+#include <TimeLib.h>
+#include <Ethernet.h>
+#include <EthernetUdp.h>
+#include <SPI.h>
+
+byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; 
+// NTP Servers:
+IPAddress timeServer(132, 163, 4, 101); // time-a.timefreq.bldrdoc.gov
+// IPAddress timeServer(132, 163, 4, 102); // time-b.timefreq.bldrdoc.gov
+// IPAddress timeServer(132, 163, 4, 103); // time-c.timefreq.bldrdoc.gov
+
+
+const int timeZone = 1;     // Central European Time
+//const int timeZone = -5;  // Eastern Standard Time (USA)
+//const int timeZone = -4;  // Eastern Daylight Time (USA)
+//const int timeZone = -8;  // Pacific Standard Time (USA)
+//const int timeZone = -7;  // Pacific Daylight Time (USA)
+
+
+EthernetUDP Udp;
+unsigned int localPort = 8888;  // local port to listen for UDP packets
+
+void setup() 
+{
+  Serial.begin(9600);
+  while (!Serial) ; // Needed for Leonardo only
+  delay(250);
+  Serial.println("TimeNTP Example");
+  if (Ethernet.begin(mac) == 0) {
+    // no point in carrying on, so do nothing forevermore:
+    while (1) {
+      Serial.println("Failed to configure Ethernet using DHCP");
+      delay(10000);
+    }
+  }
+  Serial.print("IP number assigned by DHCP is ");
+  Serial.println(Ethernet.localIP());
+  Udp.begin(localPort);
+  Serial.println("waiting for sync");
+  setSyncProvider(getNtpTime);
+}
+
+time_t prevDisplay = 0; // when the digital clock was displayed
+
+void loop()
+{  
+  if (timeStatus() != timeNotSet) {
+    if (now() != prevDisplay) { //update the display only if time has changed
+      prevDisplay = now();
+      digitalClockDisplay();  
+    }
+  }
+}
+
+void digitalClockDisplay(){
+  // digital clock display of the time
+  Serial.print(hour());
+  printDigits(minute());
+  printDigits(second());
+  Serial.print(" ");
+  Serial.print(day());
+  Serial.print(" ");
+  Serial.print(month());
+  Serial.print(" ");
+  Serial.print(year()); 
+  Serial.println(); 
+}
+
+void printDigits(int digits){
+  // utility for digital clock display: prints preceding colon and leading 0
+  Serial.print(":");
+  if(digits < 10)
+    Serial.print('0');
+  Serial.print(digits);
+}
+
+/*-------- NTP code ----------*/
+
+const int NTP_PACKET_SIZE = 48; // NTP time is in the first 48 bytes of message
+byte packetBuffer[NTP_PACKET_SIZE]; //buffer to hold incoming & outgoing packets
+
+time_t getNtpTime()
+{
+  while (Udp.parsePacket() > 0) ; // discard any previously received packets
+  Serial.println("Transmit NTP Request");
+  sendNTPpacket(timeServer);
+  uint32_t beginWait = millis();
+  while (millis() - beginWait < 1500) {
+    int size = Udp.parsePacket();
+    if (size >= NTP_PACKET_SIZE) {
+      Serial.println("Receive NTP Response");
+      Udp.read(packetBuffer, NTP_PACKET_SIZE);  // read packet into the buffer
+      unsigned long secsSince1900;
+      // convert four bytes starting at location 40 to a long integer
+      secsSince1900 =  (unsigned long)packetBuffer[40] << 24;
+      secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
+      secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
+      secsSince1900 |= (unsigned long)packetBuffer[43];
+      return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR;
+    }
+  }
+  Serial.println("No NTP Response :-(");
+  return 0; // return 0 if unable to get the time
+}
+
+// send an NTP request to the time server at the given address
+void 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);
+  Udp.endPacket();
+}

test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html