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b545d67e26
Summary: related to T12804 Reviewers: ivica Reviewed By: ivica Subscribers: miljen, iljazovic Differential Revision: https://repo.mireo.local/D28516
67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
//[timeout_with_awaitable_operators
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#include <iostream>
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#include <boost/asio/as_tuple.hpp>
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#include <boost/asio/io_context.hpp>
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#include <boost/asio/co_spawn.hpp>
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#include <boost/asio/detached.hpp>
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#include <boost/asio/steady_timer.hpp>
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#include <boost/asio/use_awaitable.hpp>
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#include <boost/asio/experimental/awaitable_operators.hpp>
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#include <boost/asio/experimental/parallel_group.hpp>
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#include <boost/asio/ip/tcp.hpp>
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#include <async_mqtt5.hpp>
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#ifdef BOOST_ASIO_HAS_CO_AWAIT
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// Modified completion token that will prevent co_await from throwing exceptions.
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constexpr auto use_nothrow_awaitable = boost::asio::as_tuple(boost::asio::use_awaitable);
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using client_type = async_mqtt5::mqtt_client<boost::asio::ip::tcp::socket>;
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boost::asio::awaitable<void> send_over_mqtt(client_type& client, const std::string& message) {
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client.brokers("<your-mqtt-broker>", 1883)
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.async_run(boost::asio::detached);
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auto&& [pec, prc, puback_props] = co_await client.async_publish<async_mqtt5::qos_e::at_least_once>(
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"<your-mqtt-topic>", message,
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async_mqtt5::retain_e::no, async_mqtt5::publish_props {},
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use_nothrow_awaitable
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);
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co_await client.async_disconnect(use_nothrow_awaitable);
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}
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int main() {
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boost::asio::io_context ioc;
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co_spawn(ioc, [&ioc]() -> boost::asio::awaitable<void> {
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// Construct the Client.
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async_mqtt5::mqtt_client<boost::asio::ip::tcp::socket> client(ioc);
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// Construct the timer.
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boost::asio::steady_timer timer(ioc, std::chrono::seconds(5));
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using namespace boost::asio::experimental::awaitable_operators;
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auto res = co_await (
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send_over_mqtt(client, "Hello world!") ||
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timer.async_wait(use_nothrow_awaitable)
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);
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// The timer expired first. The client is cancelled.
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if (res.index() == 1)
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std::cout << "Send over MQTT timed out!" << std::endl;
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// send_over_mqtt completed first. The timer is cancelled.
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else
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std::cout << "Send over MQTT completed!" << std::endl;
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}, boost::asio::detached);
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ioc.run();
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}
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#endif
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//]
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