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echoUdpAsync.cpp
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echoUdpAsync.cpp
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/**
* ASIO echo UDP asynchronous server
*
* Author: Manny egalli64@gmail.com
* Info: http://thisthread.blogspot.com/2018/03/boost-asio-echo-udp-asynchronous-server.html
* Based on: http://www.boost.org/doc/libs/1_66_0/doc/html/boost_asio/example/cpp11/echo/async_udp_echo_server.cpp
*/
#include <iostream>
#include <functional>
#include <boost/asio/io_context.hpp>
#include <boost/asio/ip/udp.hpp>
namespace ba = boost::asio;
namespace bs = boost::system;
using ba::ip::udp;
namespace
{
const int MAX_LEN = 1'024;
const uint16_t ECHO_PORT = 50'015;
class Server
{
private:
udp::socket socket_;
udp::endpoint endpoint_;
char data_[MAX_LEN];
public:
Server(ba::io_context& io) : socket_(io, udp::endpoint(udp::v4(), ECHO_PORT))
{
receive();
}
void receive()
{
std::cout << "Server ready" << std::endl;
socket_.async_receive_from(ba::buffer(data_), endpoint_,
[this](bs::error_code ec, std::size_t len)
{
if (!ec && len > 0)
{
send(len);
}
else
{
std::cout << ec.message() << std::endl;
receive();
}
});
}
void send(std::size_t len)
{
socket_.async_send_to(ba::buffer(data_, len), endpoint_, std::bind(&Server::receive, this));
}
};
}
int main(int argc, char* argv[])
{
ba::io_context io;
try
{
Server server{ io };
io.run();
}
catch (std::exception& e)
{
std::cerr << "Exception: " << e.what() << "\n";
}
}