UDPClient.hpp

#ifndef UDPCLIENT_HPP
#define UDPCLIENT_HPP

#define ASIO_STANDALONE
#include <asio.hpp>

class UDPClient
{
private:
	asio::ip::udp::endpoint endpoint;
	asio::ip::udp::socket socket;

public:
	UDPClient(
		asio::io_context& io_contex, 
		const std::string host, 
		const short port)
		: socket(io_contex)
	{
		asio::ip::udp::endpoint endpoint_(asio::ip::address::from_string(host), port);
		endpoint = endpoint_;
	}

	~UDPClient()
	{
		Close();		
	}

	void Open()
	{
		socket.open(asio::ip::udp::v4());
	}

	void Close()
	{
		socket.close();
	}

	template <typename T>
	void Send(T msg,int size)
	{
		socket.send_to(asio::buffer(&msg, size), endpoint);
	}
};

#endif

udptest.cpp

#define ASIO_STANDALONE
#include <asio.hpp>
#include <iostream>
#include "UDPClient.hpp"

int main(int argc, char const *argv[])
{
    asio::io_context io_context;
    const std::string host = "127.0.0.1"; 
	const short port = (short)60000;

    UDPClient udp(io_context,host,port);
    udp.Open();    
    for(;;)
    {
        std::string inmsg;
        getline(std::cin, inmsg);        
        if(inmsg=="q") break;
        inmsg+="\r\n\r\n";
        udp.Send(inmsg,inmsg.size());
    }
    udp.Close();

    return 0;
}