AsyncUdp_ESP32_ENC

Table of Contents

Why do we need this AsyncUdp_ESP32_ENC library
- Features
- Why Async is better
- Currently supported Boards
Changelog
Prerequisites
Installation
- Use Arduino Library Manager
- Manual Install
- VS Code & PlatformIO
Libraries' Patches
- 1. For fixing ESP32 compile error
HOWTO Fix Multiple Definitions Linker Error
HOWTO Use analogRead() with ESP32 running WiFi and/or BlueTooth (BT/BLE)
- 1. ESP32 has 2 ADCs, named ADC1 and ADC2
- 2. ESP32 ADCs functions
- 3. ESP32 WiFi uses ADC2 for WiFi functions
HOWTO Setting up the Async UDP Client
Examples
- 1. AsyncUDPClient
- 2. AsyncUdpNTPClient
- 3. AsyncUdpSendReceive
- 4. AsyncUDPServer
- 5. AsyncUDPMulticastServer
- 6. multiFileProject New
Example AsyncUdpNTPClient
- File AsyncUdpNTPClient.ino
Debug Terminal Output Samples
- 1. AsyncUdpNTPClient on ESP32_DEV with ESP32_ENC28J60
- 2. AsyncUDPSendReceive on ESP32_DEV with ESP32_ENC28J60
Debug
Troubleshooting
Issues
TO DO
DONE
Contributions and Thanks
Contributing
License
Copyright

Why do we need this AsyncUdp_ESP32_ENC library

Features

This AsyncUdp_ESP32_ENC library is a fully asynchronous UDP library, designed for a trouble-free, multi-connection network environment, for ESP32 boards using LwIP ENC28J60 Ethernet. The library is easy to use and includes support for Unicast, Broadcast and Multicast environments.

This library is based on, modified from:

Hristo Gochkov's AsyncUDP

to apply the better and faster asynchronous feature of the powerful AsyncUDP into ESP32 boards using LwIP ENC28J60 Ethernet.

Why Async is better

Using asynchronous network means that you can handle more than one connection at the same time
You are called once the request is ready and parsed
When you send the response, you are immediately ready to handle other connections while the server is taking care of sending the response in the background
Speed is OMG
After connecting to a UDP server as an Async Client, you are immediately ready to handle other connections while the Client is taking care of receiving the UDP responding packets in the background.
You are not required to check in a tight loop() the arrival of the UDP responding packets to process them.

Currently supported Boards

ESP32_ENC boards using ESP32 boards with LwIP ENC28J60 Ethernet

Prerequisites

Arduino IDE 1.8.19+ for Arduino
ESP32 Core 2.0.5+ for ESP32-based boards.
WebServer_ESP32_ENC library 1.5.1+. To install, check

Installation

The suggested way to install is to:

Use Arduino Library Manager

The best way is to use Arduino Library Manager. Search for AsyncUdp_ESP32_ENC, then select / install the latest version. You can also use this link for more detailed instructions.

Manual Install

Navigate to AsyncUdp_ESP32_ENC page.
Download the latest release AsyncUdp_ESP32_ENC-main.zip.
Extract the zip file to AsyncUdp_ESP32_ENC-main directory
Copy the whole AsyncUdp_ESP32_ENC-main folder to Arduino libraries' directory such as ~/Arduino/libraries/.

VS Code & PlatformIO:

Install VS Code
Install PlatformIO
Install AsyncUdp_ESP32_ENC library by using Library Manager. Search for AsyncUdp_ESP32_ENC in Platform.io Author's Libraries
Use included platformio.ini file from examples to ensure that all dependent libraries will installed automatically. Please visit documentation for the other options and examples at Project Configuration File

Libraries' Patches

1. For fixing ESP32 compile error

To fix ESP32 compile error, just copy the following file into the ESP32 cores/esp32 directory (e.g. ./arduino-1.8.19/hardware/espressif/cores/esp32) to overwrite the old file:

Server.h

HOWTO Fix `Multiple Definitions` Linker Error

The current library implementation, using xyz-Impl.h instead of standard xyz.cpp, possibly creates certain Multiple Definitions Linker error in certain use cases.

You can include this .hpp file

// Can be included as many times as necessary, without `Multiple Definitions` Linker Error
#include "AsyncUdp_ESP32_ENC.hpp"     //https://github.com/khoih-prog/AsyncUdp_ESP32_ENC

in many files. But be sure to use the following .h file in just 1 .h, .cpp or .ino file, which must not be included in any other file, to avoid Multiple Definitions Linker Error

// To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error
#include "AsyncUdp_ESP32_ENC.h"       //https://github.com/khoih-prog/AsyncUdp_ESP32_ENC

Check the new multiFileProject example for a HOWTO demo.

HOWTO Use analogRead() with ESP32 running WiFi and/or BlueTooth (BT/BLE)

Please have a look at ESP_WiFiManager Issue 39: Not able to read analog port when using the autoconnect example to have more detailed description and solution of the issue.

1. ESP32 has 2 ADCs, named ADC1 and ADC2

2. ESP32 ADCs functions

ADC1 controls ADC function for pins GPIO32-GPIO39
ADC2 controls ADC function for pins GPIO0, 2, 4, 12-15, 25-27

3.. ESP32 WiFi uses ADC2 for WiFi functions

Look in file adc_common.c

In ADC2, there're two locks used for different cases:

lock shared with app and Wi-Fi: ESP32: When Wi-Fi using the ADC2, we assume it will never stop, so app checks the lock and returns immediately if failed. ESP32S2: The controller's control over the ADC is determined by the arbiter. There is no need to control by lock.

lock shared between tasks: when several tasks sharing the ADC2, we want to guarantee all the requests will be handled. Since conversions are short (about 31us), app returns the lock very soon, we use a spinlock to stand there waiting to do conversions one by one.

adc2_spinlock should be acquired first, then adc2_wifi_lock or rtc_spinlock.

HOWTO Setting up the Async UDP Client

#if !( defined(ESP32) )
  #error This code is designed for (ESP32 + ENC28J60) to run on ESP32 platform! Please check your Tools->Board setting.
#endif

#include <Arduino.h>

#define ASYNC_UDP_ESP32_ENC_DEBUG_PORT      Serial

// Use from 0 to 4. Higher number, more debugging messages and memory usage.
#define _ASYNC_UDP_ESP32_ENC_LOGLEVEL_      1

//////////////////////////////////////////////////////////

// Optional values to override default settings
//#define SPI_HOST            1
//#define SPI_CLOCK_MHZ       8

// Must connect INT to GPIOxx or not working
//#define INT_GPIO            4

//#define MISO_GPIO           19
//#define MOSI_GPIO           23
//#define SCK_GPIO            18
//#define CS_GPIO             5

//////////////////////////////////////////////////////////

#include <AsyncUDP_ESP32_ENC.h>

/////////////////////////////////////////////

// Enter a MAC address and IP address for your controller below.
#define NUMBER_OF_MAC      20

byte mac[][NUMBER_OF_MAC] =
{
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x01 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x02 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x03 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x04 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x05 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x06 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x07 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x08 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x09 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0A },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0B },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0C },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0D },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0E },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0F },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x10 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x11 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x12 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x13 },
  { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x14 },
};

// Select the IP address according to your local network
IPAddress myIP(192, 168, 2, 232);
IPAddress myGW(192, 168, 2, 1);
IPAddress mySN(255, 255, 255, 0);

// Google DNS Server IP
IPAddress myDNS(8, 8, 8, 8);

/////////////////////////////////////////////

#include <time.h>

// 0.ca.pool.ntp.org
IPAddress timeServerIP = IPAddress(208, 81, 1, 244);
// time.nist.gov
//IPAddress timeServerIP = IPAddress(132, 163, 96, 1);

#define NTP_REQUEST_PORT      123

char ReplyBuffer[] = "ACK";      // a string to send back

char timeServer[]         = "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
AsyncUDP Udp;

void sendACKPacket(void)
{
  Serial.println("============= sendACKPacket =============");
  
  // Send unicast ACK to the same remoteIP and remotePort we received the packet
  // The AsyncUDP_STM32 library will take care of the correct IP and port based on pcb
  Udp.write((uint8_t *) ReplyBuffer, sizeof(ReplyBuffer));
}

// send an NTP request to the time server at the given address
void createNTPpacket(void)
{
  Serial.println("============= createNTPpacket =============");

  // 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;
}

void sendNTPPacket(void)
{
  createNTPpacket();
  //Send unicast
  Udp.write(packetBuffer, sizeof(packetBuffer));
}

void parsePacket(AsyncUDPPacket packet)
{
  struct tm  ts;
  char       buf[80];
  
  memcpy(packetBuffer, packet.data(), sizeof(packetBuffer));

  Serial.print("Received UDP Packet Type: ");
  Serial.println(packet.isBroadcast() ? "Broadcast" : packet.isMulticast() ? "Multicast" : "Unicast");
  Serial.print("From: ");
  Serial.print(packet.remoteIP());
  Serial.print(":");
  Serial.print(packet.remotePort());
  Serial.print(", To: ");
  Serial.print(packet.localIP());
  Serial.print(":");
  Serial.print(packet.localPort());
  Serial.print(", Length: ");
  Serial.print(packet.length());
  Serial.println();

  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(F("Seconds since Jan 1 1900 = "));
  Serial.println(secsSince1900);

  // now convert NTP time into )everyday time:
  Serial.print(F("Epoch/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;
  time_t epoch_t = epoch;   //secsSince1900 - seventyYears;
 
  // print Unix time:
  Serial.println(epoch);

  // print the hour, minute and second:
  Serial.print(F("The UTC/GMT time is "));       // UTC is the time at Greenwich Meridian (GMT)

  ts = *localtime(&epoch_t);
  strftime(buf, sizeof(buf), "%a %Y-%m-%d %H:%M:%S %Z", &ts);
  Serial.println(buf);

  // send a reply, to the IP address and port that sent us the packet we received
  sendACKPacket();
}

void setup()
{
  Serial.begin(115200);
  while (!Serial && (millis() < 5000));

  Serial.print(F("\nStart AsyncUDPSendReceive on "));
  Serial.print(ARDUINO_BOARD);
  Serial.print(F(" with "));
  Serial.println(SHIELD_TYPE);
  Serial.println(WEBSERVER_ESP32_ENC_VERSION);
  Serial.println(ASYNC_UDP_ESP32_ENC_VERSION);

  Serial.setDebugOutput(true);

  ET_LOGWARN(F("Default SPI pinout:"));
  ET_LOGWARN1(F("MOSI:"), MOSI_GPIO);
  ET_LOGWARN1(F("MISO:"), MISO_GPIO);
  ET_LOGWARN1(F("SCK:"),  SCK_GPIO);
  ET_LOGWARN1(F("CS:"),   CS_GPIO);
  ET_LOGWARN1(F("INT:"),  INT_GPIO);
  ET_LOGWARN1(F("SPI Clock (MHz):"), SPI_CLOCK_MHZ);
  ET_LOGWARN(F("========================="));

  ///////////////////////////////////

  // To be called before ETH.begin()
  ESP32_ENC_onEvent();

  // start the ethernet connection and the server:
  // Use DHCP dynamic IP and random mac
  uint16_t index = millis() % NUMBER_OF_MAC;

  //bool begin(int MISO_GPIO, int MOSI_GPIO, int SCLK_GPIO, int CS_GPIO, int INT_GPIO, int SPI_CLOCK_MHZ,
  //           int SPI_HOST, uint8_t *ENC28J60_Mac = ENC28J60_Default_Mac);
  //ETH.begin( MISO_GPIO, MOSI_GPIO, SCK_GPIO, CS_GPIO, INT_GPIO, SPI_CLOCK_MHZ, SPI_HOST );
  ETH.begin( MISO_GPIO, MOSI_GPIO, SCK_GPIO, CS_GPIO, INT_GPIO, SPI_CLOCK_MHZ, SPI_HOST, mac[index] );

  // Static IP, leave without this line to get IP via DHCP
  //bool config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, IPAddress dns1 = 0, IPAddress dns2 = 0);
  //ETH.config(myIP, myGW, mySN, myDNS);

  ESP32_ENC_waitForConnect();

  ///////////////////////////////////

  // Client address
  Serial.print("AsyncUDPSendReceive started @ IP address: ");
  Serial.println(ETH.localIP());

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

  //NTP requests are to port NTP_REQUEST_PORT = 123
  if (Udp.connect(timeServerIP, NTP_REQUEST_PORT))
  {
    Serial.println("UDP connected");

    Udp.onPacket([](AsyncUDPPacket packet)
    {
      parsePacket(packet);
    });
  }
}

void loop()
{
  sendNTPPacket();

  // wait 60 seconds before asking for the time again
  delay(60000);
}

Examples

Example AsyncUdpNTPClient

File AsyncUdpNTPClient.ino

AsyncUdp_ESP32_ENC/examples/AsyncUdpNTPClient/AsyncUdpNTPClient.ino

Lines 11 to 244 in 6647e6a

    
           #if !( defined(ESP32) ) 
        
             #error This code is designed for (ESP32 + ENC28J60) to run on ESP32 platform! Please check your Tools->Board setting. 
        
           #endif 
        
           #include <Arduino.h> 
        
           #define ASYNC_UDP_ESP32_ENC_DEBUG_PORT      Serial 
        
           // Use from 0 to 4. Higher number, more debugging messages and memory usage. 
        
           #define _ASYNC_UDP_ESP32_ENC_LOGLEVEL_      1 
        
           ////////////////////////////////////////////////////////// 
        
           // Optional values to override default settings 
        
           //#define SPI_HOST            1 
        
           //#define SPI_CLOCK_MHZ       8 
        
           // Must connect INT to GPIOxx or not working 
        
           //#define INT_GPIO            4 
        
           //#define MISO_GPIO           19 
        
           //#define MOSI_GPIO           23 
        
           //#define SCK_GPIO            18 
        
           //#define CS_GPIO             5 
        
           ////////////////////////////////////////////////////////// 
        
           #include <AsyncUDP_ESP32_ENC.h> 
        
           ///////////////////////////////////////////// 
        
           // Enter a MAC address and IP address for your controller below. 
        
           #define NUMBER_OF_MAC      20 
        
           byte mac[][NUMBER_OF_MAC] = 
        
           { 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x01 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x02 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x03 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x04 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x05 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x06 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x07 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x08 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x09 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0A }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0B }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0C }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0D }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x0E }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x0F }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x10 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x11 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x12 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x13 }, 
        
             { 0xDE, 0xAD, 0xBE, 0xEF, 0xBE, 0x14 }, 
        
           }; 
        
           // Select the IP address according to your local network 
        
           IPAddress myIP(192, 168, 2, 232); 
        
           IPAddress myGW(192, 168, 2, 1); 
        
           IPAddress mySN(255, 255, 255, 0); 
        
           // Google DNS Server IP 
        
           IPAddress myDNS(8, 8, 8, 8); 
        
           ///////////////////////////////////////////// 
        
           #include <time.h> 
        
           // 0.ca.pool.ntp.org 
        
           IPAddress timeServerIP = IPAddress(208, 81, 1, 244); 
        
           // time.nist.gov 
        
           //IPAddress timeServerIP = IPAddress(132, 163, 96, 1); 
        
           #define NTP_REQUEST_PORT      123 
        
           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 
        
           AsyncUDP Udp; 
        
           // send an NTP request to the time server at the given address 
        
           void createNTPpacket(void) 
        
           { 
        
             Serial.println("============= createNTPpacket ============="); 
        
             // 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; 
        
           } 
        
           void parsePacket(AsyncUDPPacket packet) 
        
           { 
        
             struct tm  ts; 
        
             char       buf[80]; 
        
             memcpy(packetBuffer, packet.data(), sizeof(packetBuffer)); 
        
             Serial.print("Received UDP Packet Type: "); 
        
             Serial.println(packet.isBroadcast() ? "Broadcast" : packet.isMulticast() ? "Multicast" : "Unicast"); 
        
             Serial.print("From: "); 
        
             Serial.print(packet.remoteIP()); 
        
             Serial.print(":"); 
        
             Serial.print(packet.remotePort()); 
        
             Serial.print(", To: "); 
        
             Serial.print(packet.localIP()); 
        
             Serial.print(":"); 
        
             Serial.print(packet.localPort()); 
        
             Serial.print(", Length: "); 
        
             Serial.print(packet.length()); 
        
             Serial.println(); 
        
             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(F("Seconds since Jan 1 1900 = ")); 
        
             Serial.println(secsSince1900); 
        
             // now convert NTP time into )everyday time: 
        
             Serial.print(F("Epoch/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; 
        
             time_t epoch_t = epoch;   //secsSince1900 - seventyYears; 
        
             // print Unix time: 
        
             Serial.println(epoch); 
        
             // print the hour, minute and second: 
        
             Serial.print(F("The UTC/GMT time is "));       // UTC is the time at Greenwich Meridian (GMT) 
        
             ts = *localtime(&epoch_t); 
        
             strftime(buf, sizeof(buf), "%a %Y-%m-%d %H:%M:%S %Z", &ts); 
        
             Serial.println(buf); 
        
           } 
        
           void sendNTPPacket(void) 
        
           { 
        
             createNTPpacket(); 
        
             //Send unicast 
        
             Udp.write(packetBuffer, sizeof(packetBuffer)); 
        
           } 
        
           void setup() 
        
           { 
        
             Serial.begin(115200); 
        
             while (!Serial && (millis() < 5000)); 
        
             Serial.print(F("\nStart AsyncUdpNTPClient on ")); 
        
             Serial.print(ARDUINO_BOARD); 
        
             Serial.print(F(" with ")); 
        
             Serial.println(SHIELD_TYPE); 
        
             Serial.println(WEBSERVER_ESP32_ENC_VERSION); 
        
             Serial.println(ASYNC_UDP_ESP32_ENC_VERSION); 
        
             Serial.setDebugOutput(true); 
        
             ET_LOGWARN(F("Default SPI pinout:")); 
        
             ET_LOGWARN1(F("MOSI:"), MOSI_GPIO); 
        
             ET_LOGWARN1(F("MISO:"), MISO_GPIO); 
        
             ET_LOGWARN1(F("SCK:"),  SCK_GPIO); 
        
             ET_LOGWARN1(F("CS:"),   CS_GPIO); 
        
             ET_LOGWARN1(F("INT:"),  INT_GPIO); 
        
             ET_LOGWARN1(F("SPI Clock (MHz):"), SPI_CLOCK_MHZ); 
        
             ET_LOGWARN(F("=========================")); 
        
             /////////////////////////////////// 
        
             // To be called before ETH.begin() 
        
             ESP32_ENC_onEvent(); 
        
             // start the ethernet connection and the server: 
        
             // Use DHCP dynamic IP and random mac 
        
             uint16_t index = millis() % NUMBER_OF_MAC; 
        
             //bool begin(int MISO_GPIO, int MOSI_GPIO, int SCLK_GPIO, int CS_GPIO, int INT_GPIO, int SPI_CLOCK_MHZ, 
        
             //           int SPI_HOST, uint8_t *ENC28J60_Mac = ENC28J60_Default_Mac); 
        
             //ETH.begin( MISO_GPIO, MOSI_GPIO, SCK_GPIO, CS_GPIO, INT_GPIO, SPI_CLOCK_MHZ, SPI_HOST ); 
        
             ETH.begin( MISO_GPIO, MOSI_GPIO, SCK_GPIO, CS_GPIO, INT_GPIO, SPI_CLOCK_MHZ, SPI_HOST, mac[index] ); 
        
             // Static IP, leave without this line to get IP via DHCP 
        
             //bool config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, IPAddress dns1 = 0, IPAddress dns2 = 0); 
        
             //ETH.config(myIP, myGW, mySN, myDNS); 
        
             ESP32_ENC_waitForConnect(); 
        
             /////////////////////////////////// 
        
             // Client address 
        
             Serial.print("AsyncUdpNTPClient started @ IP address: "); 
        
             Serial.println(ETH.localIP()); 
        
             //NTP requests are to port NTP_REQUEST_PORT = 123 
        
             if (Udp.connect(timeServerIP, NTP_REQUEST_PORT)) 
        
             { 
        
               Serial.println("UDP connected"); 
        
               Udp.onPacket([](AsyncUDPPacket packet) 
        
               { 
        
                 parsePacket(packet); 
        
               }); 
        
             } 
        
           } 
        
           void loop() 
        
           { 
        
             sendNTPPacket(); 
        
             // wait 60 seconds before asking for the time again 
        
             delay(60000); 
        
           }

Debug Terminal Output Samples

1. AsyncUdpNTPClient on ESP32_DEV with ESP32_ENC28J60

This is terminal debug output when running AsyncUdpNTPClient on ESP32_ENC (ESP32 + ENC28J60). It connects to NTP Server using AsyncUdp_ESP32_ENC library, and requests NTP time every 60s. The packet is then received and processed asynchronously to print current UTC/GMT time.

Connect to NTP server 0.ca.pool.ntp.org (IP=208.81.1.244)

Start AsyncUdpNTPClient on ESP32_DEV with ESP32_ENC28J60
WebServer_ESP32_ENC v1.5.1 for core v2.0.0+
AsyncUdp_ESP32_ENC v2.0.0 for core v2.0.0+

ETH Started
ETH Connected
ETH MAC: DE:AD:BE:EF:FE:09, IPv4: 192.168.2.94
FULL_DUPLEX, 10Mbps
AsyncUdpNTPClient started @ IP address: 192.168.2.94
UDP connected
============= createNTPpacket =============
Received UDP Packet Type: Unicast
From: 208.81.1.244:123, To: 192.168.2.94:60421, Length: 48
Seconds since Jan 1 1900 = 3878658567
Epoch/Unix time = 1669669767
The UTC/GMT time is Mon 2022-11-28 21:09:27 GMT

2. AsyncUDPSendReceive on ESP32_DEV with ESP32_ENC28J60

This is terminal debug output when running AsyncUDPSendReceive on ESP32_ENC (ESP32 + ENC28J60). It connects to NTP Server 0.ca.pool.ntp.org (IP=208.81.1.244) using AsyncUdp_ESP32_ENC library, and requests NTP time every 60s. The packet is received and processed asynchronously to print current UTC/GMT time. The ACK packet is then sent.

Start AsyncUDPSendReceive on ESP32_DEV with ESP32_ENC28J60
WebServer_ESP32_ENC v1.5.1 for core v2.0.0+
AsyncUdp_ESP32_ENC v2.0.0 for core v2.0.0+

ETH Started
ETH Connected
ETH MAC: DE:AD:BE:EF:FE:09, IPv4: 192.168.2.94
FULL_DUPLEX, 10Mbps
AsyncUDPSendReceive started @ IP address: 192.168.2.94

Starting connection to server...
UDP connected
============= createNTPpacket =============
Received UDP Packet Type: Unicast
From: 208.81.1.244:123, To: 192.168.2.94:55586, Length: 48
Seconds since Jan 1 1900 = 3878660103
Epoch/Unix time = 1669671303
The UTC/GMT time is Mon 2022-11-28 21:35:03 GMT
============= sendACKPacket =============

Debug

Debug is enabled by default on Serial. To disable, use level 0

#define ASYNC_UDP_ESP32_ENC_DEBUG_PORT      Serial

// Use from 0 to 4. Higher number, more debugging messages and memory usage.
#define _ASYNC_UDP_ESP32_ENC_LOGLEVEL_      1

You can also change the debugging level from 0 to 4

#define ASYNC_UDP_ESP32_ENC_DEBUG_PORT      Serial

// Use from 0 to 4. Higher number, more debugging messages and memory usage.
#define _ASYNC_UDP_ESP32_ENC_LOGLEVEL_      4

Troubleshooting

If you get compilation errors, more often than not, you may need to install a newer version of Arduino IDE, the Arduino STM32 core or depending libraries.

Sometimes, the library will only work if you update the STM32 core to the latest version because I am always using the latest cores /libraries.

Issues

Submit issues to: AsyncUdp_ESP32_ENC issues

TO DO

Fix bug. Add enhancement

DONE

Initial port to to ESP32_ENC (ESP32 + ENC28J60)
Add more examples.
Add debugging features.
Fix bug in ESP32_ENC examples to reduce connection time
Fix multiple-definitions linker error.
Add example multiFileProject to demo for multiple-file project

Contributions and Thanks

Based on and modified from Hristo Gochkov's AsyncUDP. Many thanks to Hristo Gochkov for great AsyncUDP Library
Thanks to tobozo to make the library ESP32-ENC28J60 from which this library uses some ideas and codes

_{⭐️⭐️ Hristo Gochkov}

_tobozo

Contributing

If you want to contribute to this project:

Report bugs and errors
Ask for enhancements
Create issues and pull requests
Tell other people about this library

License

The library is licensed under GPLv3

Copyright

Copyright (c) 2018- Hristo Gochkov

Copyright (c) 2022- Khoi Hoang

License

khoih-prog/AsyncUdp_ESP32_ENC

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