QTimer stop working after connecting mqtt

[RahibeMeryem]

Hi,

I have q QTimer as :

        reset_history = new QTimer(this);
        connect(reset_history, SIGNAL(timeout()) , this, SLOT(resetHistoryList()));
        reset_history->start(8000);

it is working untill I connecting to the mqtt and stop working.

An idea ?

[Pl45m4]

@RahibeMeryem

Does the QTimer stop or does some process stop, which was triggered by your timer?

[RahibeMeryem]

@Pl45m4 no . it looks like a strange event. looks a bug

[jsulm]

@RahibeMeryem said in QTimer stop working after connecting mqtt:

it looks like a strange event. looks a bug

You should first check whether you block the event loop.
Can you show how you connect to mqtt?

[RahibeMeryem]

@jsulm

void Widget::connectMqtt()
{

    if (!ui->MqttHostName->text().isEmpty())
        hostname = ui->MqttHostName->text();
    else
        hostname = "localhost";

    MqttUserName = ui->usernameMqtt->text();
    //MQTT
    c_client = new QMqttClient(this);
    qDebug() << "CENTRAL connecting....." << endl;
    c_client->setHostname(hostname);
    c_client->setPort(1883);
    c_client->setClientId("Mac-01");
    c_client->setUsername(ui->usernameMqtt->text());
    c_client->setPassword(ui->passwordMqtt->text());
    c_client->setCleanSession(false);

    c_client->setKeepAlive(30);

    connect(c_client, &QMqttClient::stateChanged,         this, &Widget::mq_status_changed);
    connect(c_client, &QMqttClient::connected,          this, &Widget::mq_succesfully_connected);
    connect(c_client, &QMqttClient::pingResponseReceived, this, &Widget::mq_ping_received);
    connect(c_client, &QMqttClient::messageReceived,      this, &Widget::mq_message_received);
    connect(c_client, &QMqttClient::disconnected,         this, &Widget::mq_reconnect);

    c_client->connectToHost();

}

This is the mqtt connection part.

[Diackne]

try debug and set a breakpoint at end c_client->connectToHost();
or

 c_client->connectToHost();
 qDebug() << "connectToHost";

and check if thread not locked waiting for something in other part of your code

[jsulm]

@RahibeMeryem Is your app still responsive (not hanging) after connect?

[RahibeMeryem]

@jsulm Yes its working like a charm, all parts.

Only QTimers part are not working stopping..

[RahibeMeryem]

@Diackne qDebug() << "connectToHost"; printed on the log screen no problem.

Problem looks deeper. couldn't find the reason why

[RahibeMeryem]

When I create QTimer and connect in a separate Thread all is working now.