MqttSubscription¶
Description¶
The MqttSubscription object manages subscriptions of one or multiple MQTT topics published by another instance on the MQTT broker. Unless disabled explicitely via the MqttAbstractSubscription.autoSubscribe property all topics are subscribed automatically.
The parent object must be of type MqttClient.
› Inherits: | MqttAbstractSubscription |
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Properties¶
Signals¶
topicsDataChanged(SignedInteger index)¶
This signal is emitted whenever the List.dataChanged() signal is emitted, i.e. the item at index
in the topics list itself emitted the dataChanged() signal.
Example¶
import InCore.Foundation 2.5
import InCore.Mqtt 2.5
Application {
MqttClient {
clientId: "MqttSubscriptionExample"
hostname: "localhost"
MqttSubscription {
qos: 1
onSubscribedChanged: console.log("Subscribed to topics")
MqttTopic {
name: "incore/temperature"
dataType: MqttTopic.Float
onDataChanged: console.log("Device temperature changed to", data)
}
MqttTopic {
name: "incore/foo/counter"
onDataChanged: console.log("Counter changed to", data)
}
MqttTopic {
name: "incore/bar/date"
dataType: DataObject.DateTime
onDataChanged: console.log("Date changed to", data)
}
MqttTopic {
name: "incore/array"
dataType: DataObject.StringList
onDataChanged: console.log("Array data:", data)
}
}
}
}