1 //
2 // sender.cpp
3 // ~~~~~~~~~~
4 //
5 // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6 //
7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 //
10
11 #include <iostream>
12 #include <sstream>
13 #include <string>
14 #include <boost/asio.hpp>
15
16 constexpr short multicast_port = 30001;
17 constexpr int max_message_count = 10;
18
19 class sender
20 {
21 public:
sender(boost::asio::io_context & io_context,const boost::asio::ip::address & multicast_address)22 sender(boost::asio::io_context& io_context,
23 const boost::asio::ip::address& multicast_address)
24 : endpoint_(multicast_address, multicast_port),
25 socket_(io_context, endpoint_.protocol()),
26 timer_(io_context),
27 message_count_(0)
28 {
29 do_send();
30 }
31
32 private:
do_send()33 void do_send()
34 {
35 std::ostringstream os;
36 os << "Message " << message_count_++;
37 message_ = os.str();
38
39 socket_.async_send_to(
40 boost::asio::buffer(message_), endpoint_,
41 [this](boost::system::error_code ec, std::size_t /*length*/)
42 {
43 if (!ec && message_count_ < max_message_count)
44 do_timeout();
45 });
46 }
47
do_timeout()48 void do_timeout()
49 {
50 timer_.expires_after(std::chrono::seconds(1));
51 timer_.async_wait(
52 [this](boost::system::error_code ec)
53 {
54 if (!ec)
55 do_send();
56 });
57 }
58
59 private:
60 boost::asio::ip::udp::endpoint endpoint_;
61 boost::asio::ip::udp::socket socket_;
62 boost::asio::steady_timer timer_;
63 int message_count_;
64 std::string message_;
65 };
66
main(int argc,char * argv[])67 int main(int argc, char* argv[])
68 {
69 try
70 {
71 if (argc != 2)
72 {
73 std::cerr << "Usage: sender <multicast_address>\n";
74 std::cerr << " For IPv4, try:\n";
75 std::cerr << " sender 239.255.0.1\n";
76 std::cerr << " For IPv6, try:\n";
77 std::cerr << " sender ff31::8000:1234\n";
78 return 1;
79 }
80
81 boost::asio::io_context io_context;
82 sender s(io_context, boost::asio::ip::make_address(argv[1]));
83 io_context.run();
84 }
85 catch (std::exception& e)
86 {
87 std::cerr << "Exception: " << e.what() << "\n";
88 }
89
90 return 0;
91 }
92