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POBoost C++ UDP example can not transmit over internet
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  1. POBoost C++ UDP example can not transmit over internet
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    copied!<p>Hello i am experimenting with Boost C++ UDP client-server.</p> <p>I took the one of the examples that comes with ASIO and modified it a bit.</p> <p>It works very well on local network but when i host the server to one of our servers with ports correctly forwarded, it doesn't work.</p> <p>I run the UDP server and try to transmit with the client from home over the internet but none of the packets arrive to the server. I am sure that the ports are forwarded correctly and that the firewall is not getting in the way.</p> <p>Is there any difference between local network and internet as far as UDP communication is concerned?</p> <p>Following is the code of client and server:</p> <p>----Client----</p> <pre><code>#include &lt;cstdlib&gt; #include &lt;cstring&gt; #include &lt;iostream&gt; #include &lt;boost/asio.hpp&gt; using boost::asio::ip::udp; enum { max_length = 1024 }; int main(int argc, char* argv[]) { char request[max_length]; try { boost::asio::io_service io_service; udp::socket s(io_service, udp::endpoint(udp::v4(), 0)); udp::resolver resolver(io_service); udp::resolver::query query(udp::v4(), "MyPublicIp", "3002"); udp::resolver::iterator iterator = resolver.resolve(query); using namespace std; // For strlen. std::cout &lt;&lt; "Write to me: "; while(1) { std::cin.getline(request, max_length); size_t request_length = strlen(request); s.send_to(boost::asio::buffer(request, request_length), *iterator); char reply[max_length]; udp::endpoint sender_endpoint; size_t reply_length = s.receive_from(boost::asio::buffer(reply, max_length), sender_endpoint); std::cout &lt;&lt; Say:"; std::cout.write(reply, reply_length); std::cout &lt;&lt; "\n"; std::cout &lt;&lt; Say What?" ; } } catch (std::exception&amp; e) { std::cerr &lt;&lt; "Exception: " &lt;&lt; e.what() &lt;&lt; "\n"; } std::cin.getline(request, max_length); return 0; } </code></pre> <p>------Server------------</p> <pre><code>#include &lt;boost/chrono.hpp&gt; #include &lt;cstdlib&gt; #include &lt;iostream&gt; #include &lt;boost/bind.hpp&gt; #include &lt;boost/asio.hpp&gt; #include &lt;boost\thread\thread.hpp&gt; #include &lt;ctime&gt; using boost::asio::ip::udp; class server { public: server(boost::asio::io_service&amp; io_service, short port) : io_service_(io_service), socket_(io_service, udp::endpoint( boost::asio::ip::address_v4::any(), port)) { std::fill(data_, data_ + max_length, 0); socket_.async_receive_from( boost::asio::buffer(data_, max_length), sender_endpoint_, boost::bind(&amp;server::handle_receive_from, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } void handle_receive_from(const boost::system::error_code&amp; error, size_t bytes_recvd) { if (!error &amp;&amp; bytes_recvd &gt; 0) { td::cout &lt;&lt; "Connection from: " &lt;&lt; sender_endpoint_.address().to_string() &lt;&lt; " " &lt;&lt; sender_endpoint_.port() &lt;&lt; std::endl; socket_.async_send_to( boost::asio::buffer(data_, strlen(data_)), sender_endpoint_, boost::bind(&amp;server::handle_send_to, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } else { socket_.async_receive_from( boost::asio::buffer(data_, max_length), sender_endpoint_, boost::bind(&amp;server::handle_receive_from, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } } void handle_send_to(const boost::system::error_code&amp; /*error*/, size_t /*bytes_sent*/) { std::fill(data_, data_ + max_length, 0); socket_.async_receive_from( boost::asio::buffer(data_, max_length), sender_endpoint_, boost::bind(&amp;server::handle_receive_from, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } private: boost::asio::io_service&amp; io_service_; udp::socket socket_; udp::endpoint sender_endpoint_; enum { max_length = 300 }; char data_[max_length]; }; int main(int argc, char* argv[]) { try { std::cout &lt;&lt; "Starting server" &lt;&lt; std::endl; boost::asio::io_service io_service; short port = 3002; using namespace std; server s(io_service, port); std::cout &lt;&lt; "Server started. Listening on port:" &lt;&lt;port &lt;&lt; std::endl; io_service.run(); } catch (std::exception&amp; e) { std::cerr &lt;&lt; "Exception: " &lt;&lt; e.what() &lt;&lt; "\n"; } return 0; } </code></pre>
 

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