forked from boostorg/mqtt5
927c1c6e3a
Summary: related to T13767 T13767 Reviewers: ivica Reviewed By: ivica Subscribers: miljen, iljazovic Differential Revision: https://repo.mireo.local/D29686
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
//
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// Copyright (c) 2023-2024 Ivica Siladic, Bruno Iljazovic, Korina Simicevic
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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//[timeout_with_parallel_group
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#include <iostream>
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#include <boost/asio/io_context.hpp>
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#include <boost/asio/deferred.hpp>
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#include <boost/asio/steady_timer.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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int main() {
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boost::asio::io_context ioc;
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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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client.brokers("<your-mqtt-broker>", 1883)
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.async_run(boost::asio::detached);
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// Subscribe to a Topic.
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client.async_subscribe(
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{ "<your-mqtt-topic>" }, async_mqtt5::subscribe_props {},
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[](async_mqtt5::error_code ec, std::vector<async_mqtt5::reason_code> rcs, async_mqtt5::suback_props) {
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std::cout << "[subscribe ec]: " << ec.message() << std::endl;
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std::cout << "[subscribe rc]: " << rcs[0].message() << std::endl;
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}
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);
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// Create a parallel group to wait up to 5 seconds to receive a message
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// using client.async_receive(...).
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boost::asio::experimental::make_parallel_group(
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timer.async_wait(boost::asio::deferred),
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client.async_receive(boost::asio::deferred)
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).async_wait(
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boost::asio::experimental::wait_for_one(),
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[&client](
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std::array<std::size_t, 2> ord, // Completion order
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async_mqtt5::error_code /* timer_ec */, // timer.async_wait(...) handler signature
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// client.async_receive(...) handler signature
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async_mqtt5::error_code receive_ec,
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std::string topic, std::string payload, async_mqtt5::publish_props /* props */
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) {
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if (ord[0] == 1) {
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std::cout << "Received a message!" << std::endl;
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std::cout << "[receive ec]: " << receive_ec.message() << std::endl;
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std::cout << "[receive topic]: " << topic << std::endl;
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std::cout << "[receive payload]: " << payload << std::endl;
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}
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else
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std::cout << "Timed out! Did not receive a message within 5 seconds." << std::endl;
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client.cancel();
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}
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);
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ioc.run();
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}
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//]
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