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int main() { try { asio::io_service io_service;
Create an asio::ip::udp::socket object to receive requests on UDP port 13.
udp::socket socket(io_service, udp::endpoint(udp::v4(), 13));
Wait for a client to initiate contact with us. The remote_endpoint object will be populated by asio::ip::udp::socket::receive_from().
for (;;) { boost::array<char, 1> recv_buf; udp::endpoint remote_endpoint; asio::error error; socket.receive_from(asio::buffer(recv_buf), remote_endpoint, 0, asio::assign_error(error)); if (error && error != asio::error::message_size) throw error;
Determine what we are going to send back to the client.
std::string message = make_daytime_string();
Send the response to the remote_endpoint.
socket.send_to(asio::buffer(message), remote_endpoint, 0, asio::ignore_error()); } }
Finally, handle any exceptions.
catch (std::exception& e) { std::cerr << e.what() << std::endl; } return 0; }
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