Android Question jMQTT read retained status

[michw]

Hello
I have a question, can I use the jMQTT library when I get a message from the server to read ststus of the Retained flag?
The point is to know that the received message is out of date.

 

[Erel]

You can do it by creating your own callback with JavaObject.

Untested code:

    Dim client As JavaObject = mqtt
   client = client.GetField("client")
   Dim event As Object = client.CreateEventFromUI("org.eclipse.paho.client.mqttv3.MqttCallback", "callback", Null)
   client.RunMethod("setCallback", Array(event))


Sub Callback_Event (MethodName As String, Args() As Object) As Object
   Log(MethodName)
   Select MethodName
       Case "messageArrived"
           Dim topic As String = Args(0)
           Dim MqttMessage As JavaObject = Args(1)
           
       Case "connectionLost"
           Log("Connection lost")
       Case "deliveryComplete"
           
   End Select
   Return Null
End Sub

MqttMessage API: https://www.eclipse.org/paho/files/javadoc/org/eclipse/paho/client/mqttv3/MqttMessage.html

 

[michw]

Thank you,
I will test whether it works

 

[michw]

It's work perfect! Thanks Erel