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I have a simple test that sets up an MqttConnection: TEST(IoT, SimpleMqttConnection)
{
Aws::Crt::ApiHandle api_handle;
Aws::Crt::Io::EventLoopGroup iot_event_loop_group(1);
ASSERT_TRUE(iot_event_loop_group);
std::size_t max_num_hosts_in_cache = 2;
std::size_t cache_ttl = 30;
Aws::Crt::Io::DefaultHostResolver host_resolver(iot_event_loop_group, max_num_hosts_in_cache, cache_ttl);
Aws::Crt::Io::ClientBootstrap bootstrap(iot_event_loop_group, host_resolver);
ASSERT_TRUE(bootstrap);
Aws::Iot::MqttClient mqtt_client(bootstrap);
auto client_config = buildMqttConnectionConfig(); // defined elsewhere
auto mqtt_connection = mqtt_client.NewConnection(client_config);
mqtt_connection->SetReconnectTimeout(10, 10);
ASSERT_TRUE(*mqtt_connection);
std::promise<bool> connectionCompletedPromise;
std::promise<void> connectionClosedPromise;
// This will execute when an mqtt connect has completed or failed.
auto onConnectionCompleted = [&](Aws::Crt::Mqtt::MqttConnection &, int errorCode, Aws::Crt::Mqtt::ReturnCode returnCode, bool)
{
if (errorCode)
{
std::cerr << "Connection failed with error " << Aws::Crt::ErrorDebugString(errorCode);
connectionCompletedPromise.set_value(false);
}
else
{
std::cout << "Connection completed with return code " << returnCode << std::endl;
connectionCompletedPromise.set_value(true);
}
};
mqtt_connection->OnConnectionCompleted = std::move(onConnectionCompleted);
std::cout << "Connecting..." << std::endl;
auto client_id = Aws::Crt::UUID().ToString();
bool clean_session = true; // see https://github.com/aws/aws-iot-device-sdk-cpp-v2/issues/400#issuecomment-1069613603
static const int KEEP_ALIVE_SEC = 0;
if (!mqtt_connection->Connect(client_id.c_str(), clean_session, KEEP_ALIVE_SEC))
{
FAIL() << "MQTT Connection failed with error " << Aws::Crt::ErrorDebugString(mqtt_connection->LastError());
}
EXPECT_TRUE(connectionCompletedPromise.get_future().get());
std::cout << "Test scope ends." << std::endl;
}Output is But then the program hangs. If I add api_handle.SetShutdownBehavior(Aws::Crt::ApiHandleShutdownBehavior::NonBlocking);the program hangs as well. The ~ApiHandle destructor does not call What do I need to do to make the program finish cleanly? |
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Answered by
jmklix
Jul 7, 2022
Replies: 2 comments 3 replies
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It looks like your using part of SampleConnectAndDisconnect, but you seem to be missing the wait for disconnect: /*
* Invoked when a disconnect message has completed.
*/
auto onDisconnect = [&](Aws::Crt::Mqtt::MqttConnection &) {
fprintf(stdout, "Disconnect completed\n");
connectionClosedPromise.set_value();
};
...
/* Disconnect */
if (connection->Disconnect())
{
connectionClosedPromise.get_future().wait();
} |
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3 replies
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Thanks @jmklix, with that it works fine! |
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Any particular reason for not making the MqttConnection disconnect automatically during destruction? |
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I'm not entirely sure, but I was probably done so you can do each independently. You might want to disconnect but not destroy the connection |
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Answer selected by
stwirth
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Hello! Reopening this discussion to make it searchable. |
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It looks like your using part of SampleConnectAndDisconnect, but you seem to be missing the wait for disconnect: