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publisher & receiver examples, better completion token examples

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Reviewers: iljazovic, ivica

Reviewed By: ivica

Subscribers: miljen

Differential Revision: https://repo.mireo.local/D26582
This commit is contained in:
Korina Šimičević
2023-11-17 10:11:00 +01:00
parent 376393fbfa
commit 73620e5653
12 changed files with 372 additions and 149 deletions
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example/callbacks.cpp
+12 -11
View File
@@ -1,5 +1,3 @@
//[callbacks_examples
#include <boost/asio/io_context.hpp>
#include <boost/asio/ip/tcp.hpp>
@@ -12,13 +10,10 @@ namespace asio = boost::asio;
using stream_type = asio::ip::tcp::socket;
using client_type = async_mqtt5::mqtt_client<stream_type>;
/**
* This function showcases how to call each asynchronous function
* in mqtt_client using callbacks. Note that this example is not
* intended for direct execution, as the async_disconnect call
* will promptly close the client.
*/
void run_with_callbacks(client_type& client) {
//[publish_callback
// Publish an Application Message with QoS 0.
client.async_publish<async_mqtt5::qos_e::at_most_once>(
"test/mqtt-test", "Hello world!",
@@ -50,7 +45,9 @@ void run_with_callbacks(client_type& client) {
std::cout << "reason_code: " << rc.message() << std::endl;
}
);
//]
//[subscribe_callback
// Subscribe to a single Topic.
client.async_subscribe(
{ "test/mqtt-test", { async_mqtt5::qos_e::exactly_once } }, async_mqtt5::subscribe_props {},
@@ -62,7 +59,9 @@ void run_with_callbacks(client_type& client) {
std::cout << "subscribe reason_code: " << codes[0].message() << std::endl;
}
);
//]
//[receive_callback
// Receive an Application Message.
client.async_receive(
// Callback with signature void (error_code, std::string, std::string, publish_props)
@@ -74,7 +73,9 @@ void run_with_callbacks(client_type& client) {
std::cout << "payload: " << payload << std::endl;
}
);
//]
//[unsubscribe_callback
// Unsubscribe from the Topic.
client.async_unsubscribe("test/mqtt-test", async_mqtt5::unsubscribe_props {},
//Callback with signature void (error_code, std::vector<reason_code>, unsuback_props)
@@ -85,7 +86,9 @@ void run_with_callbacks(client_type& client) {
std::cout << "unsubscribe reason_code: " << codes[0].message() << std::endl;
}
);
//]
//[disconnect_callback
// Disconnect the Client.
client.async_disconnect(
async_mqtt5::disconnect_rc_e::disconnect_with_will_message,
@@ -93,7 +96,7 @@ void run_with_callbacks(client_type& client) {
// Callback with signature void (error_code)
[](async_mqtt5::error_code) {}
);
//]
}
int main(int argc, char** argv) {
@@ -110,5 +113,3 @@ int main(int argc, char** argv) {
ioc.run();
}
//]