{"id":2400,"date":"2019-06-06T12:29:43","date_gmt":"2019-06-06T11:29:43","guid":{"rendered":"https:\/\/ridgesolutions.ie\/?p=2400"},"modified":"2019-11-15T18:16:51","modified_gmt":"2019-11-15T17:16:51","slug":"boost-asio-simple-udp-send-packet-example","status":"publish","type":"post","link":"https:\/\/www.ridgesolutions.ie\/index.php\/2019\/06\/06\/boost-asio-simple-udp-send-packet-example\/","title":{"rendered":"Boost ASIO Simple UDP Send Packet Example"},"content":{"rendered":"

Update:<\/b> I have written a simple Fire-And-Forget wrapper class for sending datagrams via UDP can be found here<\/a>. It handles simple transmission use cases while hiding the (sometimes confusing) boost::asio details. However, if you are interested in the details then read on!<\/p>\n

Boost.ASIO is great but if you don’t use it everyday it can be hard to remember how to use it to do even the simplest of things. I have included below a sample of simply sending a packet via UDP (ipv4), see the function called send_message(), this example code aims to be as minimal as it can be:<\/p>\n

Those spouting software engineering dogma will often tell you to steer well clear of UDP for the usual, well understood reasons, but for a certain type of application where very low latency is important, it just can’t be beat!!<\/p>\n

\r\n#include \r\n#include \r\n\r\nusing namespace boost::asio;\r\n\r\n\/\/\r\n\/\/ Send a string via UDP to the specified destination\r\n\/\/ ip addresss at the specified port (point-to-point\r\n\/\/ not broadcast)\r\n\/\/\r\nbool send_udp_message(const std::string& message, const std::string& destination_ip,\r\n\t\t\t\t\t\tconst unsigned short port) {\r\n\tio_service io_service;\r\n\tip::udp::socket socket(io_service);\r\n\r\n\t\/\/ Create the remote endpoint using the destination ip address and\r\n\t\/\/ the target port number.  This is not a broadcast\r\n\tauto remote = ip::udp::endpoint(ip::address::from_string(destination_ip), port);\r\n\r\n\ttry {\r\n\t\r\n\t\t\/\/ Open the socket, socket's destructor will\r\n\t\t\/\/ automatically close it.\r\n\t\tsocket.open(boost::asio::ip::udp::v4());\r\n\r\n\t\t\/\/ And send the string... (synchronous \/ blocking)\r\n\t\tsocket.send_to(buffer(message), remote);\r\n\t\r\n\t} catch (const boost::system::system_error& ex) {\r\n\t\t\/\/ Exception thrown!\r\n\t\t\/\/ Examine ex.code() and ex.what() to see what went wrong!\r\n\t\treturn false;\r\n\t}\r\n\r\n\treturn true;\r\n}\r\n\r\n<\/pre>\n
This is the bare-bones code, no error reporting etc.  Also it won’t broadcast, to allow for broadcast you need to include the following two lines and supply a broadcast ip address when calling the function.  Be careful if broadcasting a lot of data as it can really overload & mess-up network equipment!<\/p>\n
\r\nsocket_base::broadcast option(true);\r\nsocket.set_option(option);\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
Update: I have written a simple Fire-And-Forget wrapper class for sending datagrams via UDP can be found here. It handles simple transmission use cases while hiding the (sometimes confusing) boost::asio details. However, if you are interested in the details then read on! Boost.ASIO is great but if you don’t use it everyday it can be […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[301],"tags":[],"class_list":["post-2400","post","type-post","status-publish","format-standard","hentry","category-by-kevin-godden"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t