AsyncUDP_RP2040W Library

Why do we need this AsyncUDP_RP2040W library
Changelog
Prerequisites
Installation
HOWTO Fix Multiple Definitions Linker Error
HOWTO Setting up the Async UDP Client
Examples
- 1. For RASPBERRY_PI_PICO_W
- 2. Python test program
  - 1. UDP_packet_send.py
Example AsyncUdpNTPClient
- 1. File AsyncUdpNTPClient.ino
- 2. File defines.h
Debug Terminal Output Samples
Debug
Troubleshooting
Issues
TO DO
DONE
Contributions and Thanks
Contributing
License
Copyright

Why do we need this AsyncUDP_RP2040W library

Features

This AsyncUDP_RP2040W library is a fully asynchronous UDP library, designed for a trouble-free, multi-connection network environment, for RASPBERRY_PI_PICO_W using CYW43439 WiFi. The library is easy to use and includes support for Unicast, Broadcast and Multicast environments.

This library is based on, modified from:

to apply the better and faster asynchronous feature of the powerful ESPAsyncUDP Library into RASPBERRY_PI_PICO_W using CYW43439 WiFi using arduino-pico core v2.4.0+.

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

RASPBERRY_PI_PICO_W with CYW43439 WiFi using arduino-pico core v2.4.0+

Prerequisites

Arduino IDE 1.8.19+ for Arduino.
Earle Philhower's arduino-pico core v2.6.3+ for RASPBERRY_PI_PICO_W with CYW43439 WiFi, etc.

Installation

The suggested way to install is to:

Use Arduino Library Manager

The best way is to use Arduino Library Manager. Search for AsyncUDP_RP2040W, then select / install the latest version. You can also use this link for more detailed instructions.

Manual Install

Navigate to AsyncUDP_RP2040W page.
Download the latest release AsyncUDP_RP2040W-main.zip.
Extract the zip file to AsyncUDP_RP2040W-main directory
Copy the whole AsyncUDP_RP2040W-main folder to Arduino libraries' directory such as ~/Arduino/libraries/.

VS Code & PlatformIO:

Install VS Code
Install PlatformIO
Install AsyncUDP_RP2040W library by using Library Manager. Search for AsyncUDP_RP2040W 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

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_RP2040W.hpp"         //https://github.com/khoih-prog/AsyncUDP_RP2040W

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_RP2040W.h"           //https://github.com/khoih-prog/AsyncUDP_RP2040W

Check the multiFileProject example for a HOWTO demo.

Have a look at the discussion in Different behaviour using the src_cpp or src_h lib #80

HOWTO Setting up the Async UDP Client

#include "defines.h"
#include <time.h>

// To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error
#include <AsyncUDP_RP2040W.h>         // https://github.com/khoih-prog/AsyncUDP_RP2040W

// 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 timeServer[] = "time.nist.gov";  // NTP server
char timeServer[] = "0.ca.pool.ntp.org";

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;

int status = WL_IDLE_STATUS;

// send an NTP request to the time server at the given address
void createNTPpacket()
{
  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)
{
  ...
}

void sendNTPPacket()
{
  createNTPpacket();

  Serial.println("Sending UDP Packet");
  
  //Send unicast
  Udp.write(packetBuffer, sizeof(packetBuffer));

  Serial.println("Sent UDP Packet");
}

void printWifiStatus()
{
  ...
}

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

  Serial.print("\nStart AsyncUdpNTPClient on "); Serial.println(BOARD_NAME);
  Serial.println(ASYNC_UDP_RP2040W_VERSION);
  
  ///////////////////////////////////
  
  // check for the WiFi module:
  if (WiFi.status() == WL_NO_MODULE)
  {
    Serial.println("Communication with WiFi module failed!");
    // don't continue
    while (true);
  }

  Serial.print(F("Connecting to SSID: "));
  Serial.println(ssid);

  status = WiFi.begin(ssid, pass);

  delay(1000);
   
  // attempt to connect to WiFi network
  while ( status != WL_CONNECTED)
  {
    delay(500);
        
    // Connect to WPA/WPA2 network
    status = WiFi.status();
  }

  printWifiStatus();

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

  //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

1. For RASPBERRY_PI_PICO_W

2. Python test program

UDP_packet_send.py

Example AsyncUdpNTPClient

1. File AsyncUdpNTPClient.ino

AsyncUDP_RP2040W/examples/AsyncUdpNTPClient/AsyncUdpNTPClient.ino

Lines 10 to 195 in 0e4b844

    
           #include "defines.h" 
        
           #include <time.h> 
        
           // To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error 
        
           #include <AsyncUDP_RP2040W.h>         // https://github.com/khoih-prog/AsyncUDP_RP2040W 
        
           // 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 timeServer[] = "time.nist.gov";  // NTP server 
        
           char timeServer[] = "0.ca.pool.ntp.org"; 
        
           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; 
        
           int status = WL_IDLE_STATUS; 
        
           // send an NTP request to the time server at the given address 
        
           void createNTPpacket() 
        
           { 
        
             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() 
        
           { 
        
             createNTPpacket(); 
        
             Serial.println("Sending UDP Packet"); 
        
             //Send unicast 
        
             Udp.write(packetBuffer, sizeof(packetBuffer)); 
        
             Serial.println("Sent UDP Packet"); 
        
           } 
        
           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("Local 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"); 
        
           } 
        
           void setup() 
        
           { 
        
             Serial.begin(115200); 
        
             while (!Serial && millis() < 5000); 
        
             Serial.print("\nStart AsyncUdpNTPClient on "); Serial.println(BOARD_NAME); 
        
             Serial.println(ASYNC_UDP_RP2040W_VERSION); 
        
             /////////////////////////////////// 
        
             // check for the WiFi module: 
        
             if (WiFi.status() == WL_NO_MODULE) 
        
             { 
        
               Serial.println("Communication with WiFi module failed!"); 
        
               // don't continue 
        
               while (true); 
        
             } 
        
             Serial.print(F("Connecting to SSID: ")); 
        
             Serial.println(ssid); 
        
             status = WiFi.begin(ssid, pass); 
        
             delay(1000); 
        
             // attempt to connect to WiFi network 
        
             while ( status != WL_CONNECTED) 
        
             { 
        
               delay(500); 
        
               // Connect to WPA/WPA2 network 
        
               status = WiFi.status(); 
        
             } 
        
             printWifiStatus(); 
        
             /////////////////////////////////// 
        
             //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); 
        
           }

2. File defines.h

AsyncUDP_RP2040W/examples/AsyncUdpNTPClient/defines.h

Lines 1 to 25 in 0e4b844

    
           /**************************************************************************************************************************** 
        
             defines.h 
        
             AsyncUDP_RP2040W is a library for the RP2040W with CYW43439 WiFi 
        
             Based on and modified from ESPAsyncUDP (https://github.com/me-no-dev/ESPAsyncUDP) 
        
             Built by Khoi Hoang https://github.com/khoih-prog/AsyncUDP_RP2040W 
        
            *****************************************************************************************************************************/ 
        
           #ifndef defines_h 
        
           #define defines_h 
        
           #if !( defined(ARDUINO_RASPBERRY_PI_PICO_W) ) 
        
             #error For RASPBERRY_PI_PICO_W only 
        
           #endif 
        
           //#include <WiFi.h> 
        
           // To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error 
        
           //#include <AsyncUDP_RP2040W.h>         // https://github.com/khoih-prog/AsyncUDP_RP2040W 
        
           char ssid[] = "your_ssid";        // your network SSID (name) 
        
           char pass[] = "12345678";         // your network password (use for WPA, or use as key for WEP), length must be 8+ 
        
           #endif    //defines_h

Debug Terminal Output Samples

1. AsyncUdpNTPClient on RASPBERRY_PI_PICO_W using CYW43439 WiFi

This is terminal debug output when running AsyncUdpNTPClient on PRASPBERRY_PI_PICO_W using CYW43439 WiFi. It connects to NTP Server 0.ca.pool.ntp.org (IP=208.81.1.244:123) using AsyncUDP_RP2040W library, and requests NTP time every 60s. The packet is then received and processed asynchronously to print current UTC/GMT time.

Start AsyncUdpNTPClient on RASPBERRY_PI_PICO_W
AsyncUDP_RP2040W v1.0.0
Connecting to SSID: HueNet1
SSID: HueNet1
Local IP Address: 192.168.2.87
signal strength (RSSI):-25 dBm
UDP connected
============= createNTPpacket =============
Sending UDP Packet
Sent UDP Packet
Received UDP Packet Type: Unicast
From: 208.81.1.244:123, To: 192.168.2.87:58997, Length: 48
Seconds since Jan 1 1900 = 3842738319
Epoch/Unix time = 1633749519
The UTC/GMT time is Sat 2021-10-09 03:18:39 GMT
============= createNTPpacket =============
Sending UDP Packet
Sent UDP Packet
Received UDP Packet Type: Unicast
From: 208.81.1.244:123, To: 192.168.2.87:58997, Length: 48
Seconds since Jan 1 1900 = 3842738378
Epoch/Unix time = 1633749578
The UTC/GMT time is Sat 2021-10-09 03:19:38 GMT

2. AsyncUDPServer on RASPBERRY_PI_PICO_W using CYW43439 WiFi

This is terminal debug output when running AsyncUDPServer on RASPBERRY_PI_PICO_W using CYW43439 WiFi. It receives UDP packets from a PC running test Python program UDP_packet_send.py to send UDP packets.

Start AsyncUDPServer on RASPBERRY_PI_PICO_W
AsyncUDP_RP2040W v1.0.0
Connecting to SSID: HueNet1
SSID: HueNet1
Local IP Address: 192.168.2.87
signal strength (RSSI):-25 dBm
UDP Listening on IP: 192.168.2.87
UDP Packet Type: Unicast, From: 192.168.2.30:33380, To: 192.168.2.87:1234, Length: 27, Data: Hello, RASPBERRY_PI_PICO_W!

3. AsyncUDPMulticastServer on RASPBERRY_PI_PICO_W using CYW43439 WiFi

This is terminal debug output when running AsyncUDPMulticastServer on RASPBERRY_PI_PICO_W using CYW43439 WiFi. It receives UDP packets from from a PC running test Python program UDP_packet_send.py to send UDP packets.

Start AsyncUDPMulticastServer on RASPBERRY_PI_PICO_W
AsyncUDP_RP2040W v1.0.0
Connecting to SSID: HueNet1
SSID: HueNet1
Local IP Address: 192.168.2.87
signal strength (RSSI):-25 dBm
UDP Listening on IP: 192.168.2.87
UDP Packet Type: Unicast, From: 192.168.2.30:50119, To: 192.168.2.87:1234, Length: 27, Data: Hello, RASPBERRY_PI_PICO_W!

Debug

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

#define AUDP_RP2040W_DEBUG_PORT      Serial

// Use from 0 to 4. Higher number, more debugging messages and memory usage.
#define _AUDP_RP2040W_LOGLEVEL_      0

You can also change the debugging level from 0 to 4, default is 1 to output only error messages

#define AUDP_RP2040W_DEBUG_PORT      Serial

// Use from 0 to 4. Higher number, more debugging messages and memory usage.
#define _AUDP_RP2040W_LOGLEVEL_      4

Troubleshooting

If you get compilation errors, more often than not, you may need to install a newer version of the arduino-pico core

Sometimes, the library will only work if you update the arduino-pico core core to the latest version because I am using newly added functions.

Issues

Submit issues to: AsyncUDP_RP2040W issues

TO DO

Fix bug. Add enhancement

DONE

Add support to RASPBERRY_PI_PICO_W with CYW43439 WiFi, using arduino-pico core v2.4.0+
Add Table of Contents
Add astyle using allman style. Restyle the library

Contributions and Thanks

Based on and modified from Hristo Gochkov's ESPAsyncUDP. Many thanks to Hristo Gochkov for great ESPAsyncUDP Library

_{⭐️⭐️ Hristo Gochkov}

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

Name		Name	Last commit message	Last commit date
Latest commit History 13 Commits
.github		.github
examples		examples
pics		pics
platformio		platformio
src		src
travis		travis
utils		utils
.codespellrc		.codespellrc
.gitignore		.gitignore
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
README.md		README.md
changelog.md		changelog.md
keywords.txt		keywords.txt
library.json		library.json
library.properties		library.properties

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Repository files navigation

AsyncUDP_RP2040W Library

Table of Contents

Why do we need this AsyncUDP_RP2040W library

Features

Why Async is better

Currently supported Boards

Prerequisites

Installation

Use Arduino Library Manager

Manual Install

VS Code & PlatformIO:

HOWTO Fix `Multiple Definitions` Linker Error

HOWTO Setting up the Async UDP Client

Examples

1. For RASPBERRY_PI_PICO_W

2. Python test program

Example AsyncUdpNTPClient

1. File AsyncUdpNTPClient.ino

2. File defines.h

Debug Terminal Output Samples

1. AsyncUdpNTPClient on RASPBERRY_PI_PICO_W using CYW43439 WiFi

2. AsyncUDPServer on RASPBERRY_PI_PICO_W using CYW43439 WiFi

3. AsyncUDPMulticastServer on RASPBERRY_PI_PICO_W using CYW43439 WiFi

Debug

Troubleshooting

Issues

TO DO

DONE

Contributions and Thanks

Contributing

License

Copyright

About

Releases 1

Packages

Languages

	#include "defines.h"
	#include <time.h>

	// To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error
	#include <AsyncUDP_RP2040W.h> // https://github.com/khoih-prog/AsyncUDP_RP2040W

	// 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 timeServer[] = "time.nist.gov"; // NTP server
	char timeServer[] = "0.ca.pool.ntp.org";

	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;

	int status = WL_IDLE_STATUS;

	// send an NTP request to the time server at the given address
	void createNTPpacket()
	{
	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()
	{
	createNTPpacket();

	Serial.println("Sending UDP Packet");

	//Send unicast
	Udp.write(packetBuffer, sizeof(packetBuffer));

	Serial.println("Sent UDP Packet");
	}

	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("Local 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");
	}

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

	Serial.print("\nStart AsyncUdpNTPClient on "); Serial.println(BOARD_NAME);
	Serial.println(ASYNC_UDP_RP2040W_VERSION);

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

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

	Serial.print(F("Connecting to SSID: "));
	Serial.println(ssid);

	status = WiFi.begin(ssid, pass);

	delay(1000);

	// attempt to connect to WiFi network
	while ( status != WL_CONNECTED)
	{
	delay(500);

	// Connect to WPA/WPA2 network
	status = WiFi.status();
	}

	printWifiStatus();

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

	//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);
	}

	/****************************************************************************************************************************
	defines.h

	AsyncUDP_RP2040W is a library for the RP2040W with CYW43439 WiFi

	Based on and modified from ESPAsyncUDP (https://github.com/me-no-dev/ESPAsyncUDP)
	Built by Khoi Hoang https://github.com/khoih-prog/AsyncUDP_RP2040W
	*****************************************************************************************************************************/

	#ifndef defines_h
	#define defines_h

	#if !( defined(ARDUINO_RASPBERRY_PI_PICO_W) )
	#error For RASPBERRY_PI_PICO_W only
	#endif

	//#include <WiFi.h>

	// To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error
	//#include <AsyncUDP_RP2040W.h> // https://github.com/khoih-prog/AsyncUDP_RP2040W

	char ssid[] = "your_ssid"; // your network SSID (name)
	char pass[] = "12345678"; // your network password (use for WPA, or use as key for WEP), length must be 8+

	#endif //defines_h

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khoih-prog/AsyncUDP_RP2040W

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AsyncUDP_RP2040W Library

Table of Contents

Why do we need this AsyncUDP_RP2040W library

Features

Why Async is better

Currently supported Boards

Prerequisites

Installation

Use Arduino Library Manager

Manual Install

VS Code & PlatformIO:

HOWTO Fix Multiple Definitions Linker Error

HOWTO Setting up the Async UDP Client

Examples

1. For RASPBERRY_PI_PICO_W

2. Python test program

Example AsyncUdpNTPClient

1. File AsyncUdpNTPClient.ino

2. File defines.h

Debug Terminal Output Samples

1. AsyncUdpNTPClient on RASPBERRY_PI_PICO_W using CYW43439 WiFi

2. AsyncUDPServer on RASPBERRY_PI_PICO_W using CYW43439 WiFi

3. AsyncUDPMulticastServer on RASPBERRY_PI_PICO_W using CYW43439 WiFi

Debug

Troubleshooting

Issues

TO DO

DONE

Contributions and Thanks

Contributing

License

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HOWTO Fix `Multiple Definitions` Linker Error

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