MessageIn Event
Fired when an incoming message has been received and/or fully acknowledged.
Syntax
class MQTTMessageInEventParams {
public:
int PacketId();
const QString &Topic();
int QOS();
const QByteArray &Message();
bool Retained();
bool Duplicate();
int EventRetVal();
void SetEventRetVal(int iRetVal);
};
// To handle, connect one or more slots to this signal.
void MessageIn(MQTTMessageInEventParams *e);
// Or, subclass MQTT and override this emitter function.
virtual int FireMessageIn(MQTTMessageInEventParams *e) {...}
Remarks
The MessageIn event fires once for each incoming message either immediately after it is received (QoS 0), or after it has been fully acknowledged (QoS 1 and 2).
- PacketId: The message packet Id. This will always be -1 if QOS is 0.
- Topic: The message's topic string.
- QOS: The message's QoS level.
- Message: The message data.
- Retained: Whether or not this message was received as a result of subscribing to a topic.
- Duplicate: Whether or not the server has indicated that this message is a duplicate of another message sent previously.
Refer to MessageAck for more information about QoS 1 and 2 message processing steps.
// MessageIn event handler.mqtt1.OnMessageIn += (s, e) => { Console.WriteLine("Received message from topic '" + e.Topic + "' with QoS " + e.QOS + ":"); Console.WriteLine(e.Message);};